Chameleon Portable Resonant Vertical Tested!
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- Опубліковано 16 сер 2023
- We're taking a look at the new Chameleon Portable Resonant Vertical (CHA-PRV).
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You can PRE-ORDER your CHA PRV - NOW!
Don't misunderstand me, I love Chameleon's equipment. However, I can't justify their expense anymore since we all know there are options out there which are much less expensive, just as rugged, and work as well and often times better that Chameleon's products.
I'm thinking the same. I'm currently building out a packable rig using an icom 706mk2 and battery but haven't decided on antenna. Any ideas on a system that would fit in a backpack and not super expensive?
Ya I’d like to see some ideas like this antenna. But please much cheaper wow
Update: got a jcp-12 antenna system and its working very well for me, is designed to be packable, and was like $150 on ebay
Try wolf river coils. Same concept but not as pretty.
I love my CHA antennas. They are always first in class in my book and this is a great addition to their line. Watch for more and more products to be released between now and early next year. Some will be game changers!
I appreciate all the information you provide. I will be testing soon for Tech and General, please keep doing what you are doing. 73's Daniel
The short mast extensions are to raise the coil above the feedpoint. Moving the coil away from the feedpoint on a quarter wave improves the efficiency of the coil. WolfeRiver and SuperAntenna and Buddipole all employ similar mast extensions to be inserted between the feedpoint base and coil.
Satire: Vern W6MMA called. He wants his design back. ;)
Just as expensive
Your production quality is mint. I really like the overhead shots.
I am very excited to pick this up. Huge Chameleon antenna fan here!!
Great video Josh. I like chameleon and will I will buy the CHA-PRV, can't wait!
Thank you.
CHA Provides excellent manuals. Very detailed and well researched. You almost lost me when you said you tested it without reading the manual :) But I hung in there anyway :)
I'm just getting into Ham, and I think it's a great idea for portability!
Great Video! Can't say I'm sold on that antenna.
Good review Josh. Glad to see Chameleon putting out a resonate antenna. The 5 to 1 transformer in most other models is very lossy unless you absolutely need a broad band antenna. Most don't except for specialized cases. I'm betting it will cost north of $500., seems to be their sweet spot. This antenna will work like every other portable, coil vertical antenna, only with a big price tag cause it's ''PURDY''. The silver bullet at a much lower cost offers a larger diameter coil which is lower ''Q'', which is always better. How much of a difference that will make is most likely small. I don't know why they are not using their 17' whip. Any time you use less of or no part of the coil, you gain a lot of efficiency and signal strength. The short whip makes no sense except the long 17' whip is too long for 6 and 10 meters. Maybe they realize people will want the added efficiency and ease of the 17' whip and buy one in addition to their kit. Easy way to get more money from the consumer. Addition of a cheap short whip solves the problem of 6 and 10 meters. Last, banana clips are fast and work great until they break. I prefer the solid ring and bolt. Just as fast, much cheaper to build, so it doesn't add more cost and much more solid and reliable. Bottom line, if you're DADDY WARBUCKS AND CAN AFFORD TO BUY ALL OF THE MOST EXPENSIVE GEAR OR JUST HAVE A NEED TO IMPRESS, THIS IS YOUR ANTENNA. If your like most of us, buy the silver bullet coil, get a 17' whip and add whatever base you want or need and you will have enough money left over to buy quality coax like M&P and have some extra money left to put towards a better quality radio or other piece of gear. And, you will have a more efficient antenna. Or, get the SILVERBULLET set up and buy a EFHW antenna and a 6 to 10 meter pole and have two different types of antennas for about the same money you would spend on the Chameleon alone. A Silverbullet set up for long range and the EFHW for medium, closer in and NVIS use. Ham Harder and Ham Smarter. Also, power capacity? From the look of the thin coil wire size and maybe core material, it looks like it will turn from digital signals to smoke signals at somewhere between 30 an 50 watts.
Generally, a larger diameter coil is higher Q, not lower Q. High Q is desirable for achieving optimal efficiency, but not for achieving wide bandwidth. The WRC Silver Bullet coil uses stainless steel wire. I've been told that the Chameleon coil uses stainless steel wire. Stainless steel wire (regardless of coil size) is the antitheses of high Q coil design, but it provides wider bandwidth -- at the cost of power transfer inefficiency.
@iseethou You are correct.
@@DaDitDaagree .. I doubt the Q of these sorts of coils are anywhere much approaching 100. Probably nearer 50.
@@DaDitDa No we use silver plated copper wire.
It's great to see your interest in amateur radio and antenna technology. It seems you've provided a detailed analysis of the Chameleon antenna and your thoughts on its design. However, there are a few points in your analysis that might benefit from a broader perspective:
1. **Power Rating and Construction Materials**: The Chameleon PRV antenna has a power rating of 500W SSB and 300W CW, indicating its capability to handle reasonable power levels. Additionally, Chameleon's use of materials like Delrin, PTFE wire, silver-plated copper, and anodized aluminum can indeed contribute to the antenna's durability and performance. These materials might set the antenna apart in terms of quality and longevity.
2. **Transformer Loss**: While you mention that a 5 to 1 transformer can be lossy, it's important to note that the trade-off between bandwidth and efficiency is a fundamental aspect of antenna design. Some users do require broader bandwidth, making transformers a suitable choice. Different designs cater to different needs, so a transformer-based design can be valid in specific situations.
3. **Price and Performance**: The assumption that the antenna's higher price is solely due to aesthetics ("PURDY") might overlook the potential investments in R&D, quality materials, and advanced manufacturing techniques that can contribute to its performance. While price is a significant consideration for many, it's essential to consider the overall value and performance that a product offers.
4. **Whip Length and Efficiency**: The choice of whip length is influenced by the desired frequency range of operation. Longer whips might indeed offer increased efficiency on certain bands, but they may be impractical for certain other bands. The use of a shorter whip for addressing 6 and 10 meters suggests an attempt to strike a balance between efficiency and usability across various bands.
5. **Connector Preference**: Your preference for solid ring and bolt connectors is valid, as different operators might have different preferences based on ease of use and durability. However, banana clips are widely used due to their convenience, and while they may break, they can also be easily replaced.
6. **Comparative Value**: While you suggest the "Silverbullet" coil and other antenna options as alternatives, it's worth noting that different antennas have different design philosophies and intended use cases. What works well for one operator might not work optimally for another, depending on their specific operating scenarios.
7. **Power Handling**: Judging the antenna's power handling capacity based solely on the appearance of coil wire size and core material might not accurately predict its capabilities. The stated power ratings should be taken into consideration, as they are determined through engineering and testing.
In the world of amateur radio, various antennas cater to different needs and preferences. It's important to recognize that a single antenna might not fulfill all requirements, and the choice of antenna depends on an individual's operating goals, budget, and technical considerations. Diversity in design and offerings allows operators to choose what suits their specific needs best.
Thanks Josh, great review. I testify of the great quality and more importantly, outstanding customer service!! #BuyAmerican
Seems familiar. Looks a bit like Super Antenna MP1. I have used the MP1 and love it. Like the ruler that comes with it so you know approximately where to slide the coil, then just use your tuner to do the final tuning.
thank you for the info.
This coil will go perfectly with my Buddi Stick Pro. I currently use the WRC Mini and that set-up is awesome but I like this for the form factor, then I can put my mini back into my WRC kit along with my Silver Bullet 1,000 and use the extensions to get a much lower take off angle
That's great if you are willing to pay $350.00 just for the coil. For me, the juice is not worth the squeeze.
@@johnkaelberer237 the price definitely gave me pause
I would suggest the extensions would screw on under the coil and make the shaft longer below the coil a bit like how Hustler do it.
Just like Dave Castler said in one of his videos. A vertical is a vertical. If you like the build, materials, portability, price point. Go for it but thinking you’ve got a WRC and getting a chameleon is going to double your effectiveness. A vertical is a vertical. I’ve run their older emcomm II for a long while and been very happy with it.
Amen 👍
Thanks. Doesn't look like it has changed much since Bob debuted this antenna a month ago.
It hasn’t. It’s the same antenna Bob made a video on.
10:36 Josh and his light sabre !
The 2X 12” sections lift the coil off the ground. Elevated antenna is better performance. Top of tripod is better
From a performance perspective, the recommended number of radial/counterpoise wires is inadequate for a ground mounted, base loaded, short vertical antenna. At lowest operating frequency, a bare minimum of eight 1/10 wavelength radials, and a practical maximum of 32 1/4 wavelength. Anything between these two extremes is okay too. Generally, the greater the number and length of radials, the more efficient the antenna. Of course, for portable operation, a large evenly spaced radial field will be impractical. So, the minimum configuration above will suffice.
Also, an efficient ground mounted, base loaded, short vertical antenna will exhibit very low input impedance at lower frequencies. So, an antenna tuner or a variable step-down RF transformer (UNUN) will be helpful. If the antenna does not exhibit low input impedance, then it's operating inefficiently -- perhaps due to an inadequate radial system.
Nice, very nice!👍😃🇺🇸
interesting concept. i'm working on an antenna idea for 6m->-20m.
I got a JPC-12 (buddistick copy?) vertical which costs around $150, but it is basically the same principle as this chameleon one. I use it on 20m and 40m, and it can be tuned well below 2 SWR on the whole band. I just love it. The chameleon looks more massive though. I wonder what the price is going to be.
I’ll bet it will be very pricey, in fact I’m just gonna say it- it will be more than many rigs. It looks nice and beefy, but I’ll bet it’ll be more than I want to spend on an antenna. Thanks for the video Josh, 73, de NH7TR
The unit is ready to PRE-ORDER!
Next time you take it out get a Magic Carpet to use under it. A 4 ft by 6 ft window screen should work, maybe you can find something bigger to use as a counterpoise. Bigger may be better. There are some videos about this.
The main selling point is swr convenience. Might be better to use either a 9:1 unun or remote long wire tuner at the base with a non resonant length. Easier to band swap for less price. Plus on higher bands an antenna which is longer than a 1/4 wave and has the max current away from lossy ground.
I wanted to share some insights about using a long wire with a 9:1 transformer for your antenna setup. While this kind of setup can work well under certain conditions, it's important to note that it might not be suitable everywhere due to various factors.
Using a long wire antenna with a 9:1 transformer typically requires supports like tall trees or a portable mast to elevate the wire and achieve a decent height above the ground. This is crucial for efficient performance and reducing ground losses. Additionally, having enough open space is important to avoid interference from nearby objects and structures.
On the other hand, there's an alternative you might find interesting: the CHA PRV antenna. This small, portable antenna is equipped with a loading coil (CHA MCC) and a 58" long whip. It has a small footprint and can be easier to deploy, especially in environments where tall supports or a lot of space aren't readily available.
If you're still intrigued by the concept of end-fed antennas, Chameleon Antenna offers some great options. For instance, the CHA LEFS 8010 and the CHA LEFS 4010 are excellent choices. The CHA LEFS 4010 is specifically designed for portable operations like SOTA (Summits On The Air) and POTA (Parks On The Air). These antennas are designed to be more compact and easier to set up, making them suitable for on-the-go operations.
Keep in mind that the choice of antenna depends on your specific operating environment and goals. If you're dealing with space constraints or need a more portable solution, the CHA PRV and the CHA LEFS antennas could be great options to consider.
I'd be interested in seeing how this performs compared to the Super Antenna MP1DXMAX. It looks to be a similar design but also has extra coils to be able to use it for 60m and 80m. It can also do 6m and 2m. One thing I like is it also includes a "ruler" to hold up against the coil to get it close for the band you want (instead of using a chart and guessing how long you have it).
I have the Super Antenna, and with the add-ons. Works fantastic. The ruler is really good and works well for me. And you can always use a tuner to fine tune. 80m to 70cm (including 4m).
The kit I bought included counterpoise wires for 6/4/2m and 70cms (UK) and 40/30/20/10m.
I added the 80m coil and counteerpoise later. Also added some mounts and a tripod.
You can make your own counterpoise wires for the WARC bands, or you can buy them.
The Super Antenna is modular, buy what you want and add when you want it.
2E0GKF 73.
i feel like i’m reading two ads
@@jasesnow LOL.
Unfortunately, Super Antenna now only sells on Amazon, and Amazon is permanently boycotted.
@@denelson83 Available from other retailers here in the UK.
Your detailed explanations are excellent for newer hams. I am an old ham and have trouble realizing some things that are “obvious” to me are not. I don’t understand their radials. Why the different numbers for different bands. I would put 4 wires to each of four banana plugs.
They have sized and limited the radials to achieve a low VSWR -- at the cost of reduced radiation efficiency. Your approach of 4 radials to each of 4 banana plugs (16 radials total) is practical, in all respects. Of course, you have to deal with the moderately high VSWR (i.e., low antenna input impedance) via a matching network or transformer. Probably not much of an issue at 20M thru 10M, but below 20M it will be a problem.
@@DaDitDa Adding more radials to a short vertical antenna is a common technique used to improve its performance, primarily by enhancing the ground plane and increasing radiation efficiency. However, it's important to note that the concept of "more is better" doesn't always hold true in this scenario. There are several factors to consider when deciding how many radials to add, and blindly adding a large number of radials might not always yield the desired results.
One key factor to keep in mind is the electrical length of the radials relative to the operating wavelength. In an ideal scenario, the radials should be a quarter wavelength long to create a low-impedance ground plane that aids in radiation. When the radials are significantly shorter than a quarter wavelength, they can start to exhibit capacitive reactance, which essentially adds impedance to the antenna system. This added impedance can lead to poor antenna efficiency, increased SWR (Standing Wave Ratio), and reduced overall performance.
Adding too many radials can also lead to increased resistance in the system. The radials themselves have a certain amount of resistance due to their conductivity and length. When you add a large number of radials, the combined resistance can start to have a significant impact on the overall performance of the antenna. This increased resistance can lead to further degradation of efficiency and contribute to a higher SWR.
Furthermore, installing a large number of radials can be time-consuming and require a significant amount of space. This is particularly important in portable operations like Parks On The Air (POTA) and Summits On The Air (SOTA), where quick setup and a small footprint are crucial. Carrying and laying out a large number of radials might not be practical in such scenarios and could result in frustration and decreased operational efficiency.
The CHA PRV (Portable Random Vertical) antenna has been specifically designed with these considerations in mind. It's tailored for portable operations like POTA and SOTA, where installation speed and a small footprint are paramount. The design takes into account the trade-offs between radials, efficiency, and ease of deployment. By optimizing the number of radials and their length for the antenna's intended use, the CHA PRV antenna aims to provide a balance between performance and practicality. This design approach allows operators to quickly set up and use the antenna in environments where time, space, and ease of installation are critical factors.
Very cool...Chameleon fan here so I'll probably pick one up when available. Those two other spikes...do you think they may be there to elevate the antenna up off the ground a bit further? Thanks for the vid!
I have a knock-off of the very similar Super Antenna that I got at Dayton years ago. Poor machining and it uses metric sizes instead of standard antenna threading. Overall it is very similar to this Chameleon. It didn't get much use until I discovered POTA and is now one of my favorite antennas. Worked Antarctica from a park with this antenna. One secret to its success is that the coil is about 3 feet off the ground. That improves efficiency.
I hope Chameleon makes a SOTA version. Size and weight are paramount when dragging equipment up a mountain.
Yes- we've one kit for that!
Hopefully they will also sell the coil by itself so we can integrate it into our Buddipole- Buddistick set of parts. Looks easy to adjust vs. the Buddipole coil-tap system. But the high quality Buddipole extension arms, shock corded whips and the other pieces make buying the whole outfit redundant.
Yes! It's called CHA MCC
If you mount your Buddipole coil on an extension arm above its base, you'll be able to do the same with the CHA MCC simply by plugging a shorted PL-259 into the MMC's SO-239. In other words, regardless of configuration, the MCC can directly replace a buddipole coil by shorting the SO-239. This is different from the Super Antenna MP-1 coil that does not have a 3/8-24 threaded stud at its bottom; although, adding a threaded stud is a simple fix.
I just saw the price for the stand-alone MCC -- ouch!
You need to straighten out the radial wires. Paying attention to the ground system is the KeY to vertical efficiency.
Tell Carl at Chameleon I want one asap!!
Looks like it's good with apartments and HOAs with restrictions.
I want one
Thanks for the great video Josh. Besides the obvious physical differences, what does this bring to the party that the CHA MPAS doesn't already have (or do) ? For example, does one perform better or differently than the other ? Thanks !
The MPAS likes a tuner on some bands. The PRVT is physically adjusted for resonance.
I wonder what would happen if you put that coil on top of the extension that comes with the Chameleon MPAS 2.0 instead of that 24" extension to raise it up even higher? Looks like Im going to have to add that one to my MPAS bag and do some Frankenstein experimentation.
The 2 extensions are probably for center loading the coil.
I don't see this working with a center load due to the connector being on the coil so the bas would be grounded. A hack would be having a shorted closed connect and than using a base connecter for the coax instead.
The big question is can this handle the SS17, if not then it's a bust.
@@spareiChan good point and most likely correct. And yeah, if the thread top cap can work itself loose from the 17ft whip then that’s a miss. The future may bring design refinements though. (Like the roll pin the SS17 now has)
That’s a nice Rigexpert Stick XPro. Think I’m liking this Chameleon.
So, basically another coil+whip vertical, and that clever radial connector is the really new twist to it.
Looks nicely done.
How about adding one foot of solid 1" aluminum rod, tapped to screw onto the ground spike, so you can literally hammer the spike down, without damaging the threads? And then just remove the aluminum post.
Couldn't you just buy a long bolt that would fit the threads?
REZ Antenna came up with and released the radial puck idea earlier this year with their ranger 80 antenna so nothing new there. They simply copied the super antenna and that idea
@@Mike_12345 Just to make you're aware: It's the opposite. The puck was somewhere online for awhile already, they copied our MINI and MOCRO base and our SPIKE MOUNT!
Well if that’s true, as long as you aren’t claiming it’s innovative, then it’s fine. What’s not patented is fair game. I was just pointing that out for the OP
Josh, would you suggest them to add a “ bypass the coil” feature? I see this coil I immediately think that I’d place the ss17 on top of it and use the coil only for the bands below 20. 73!
Oh, nvm. Fully closed would be the by pass
The spiral of the should follow the coil to go up or down if you turn it or what for coil do they use in it as you turn it up or down just like a bolt and nut !!,
Pieter
It’s doesn’t work that way. The entire lip of the sleeve makes contact here. Twisting does nothing.
I would think those 2 extensions go on the spike to lift the coil and radials up above the ground.
I wonder if instead of the whip, you could use the cha mil 2.0 from the mpas, or the 17' whip from the tac dipole?
Agreed. I center load the coil like WRC design.
You likely can... but the whip this comes antenna is not the SA-17 (17') whip, it is a shorter version (extended and collapsed) that gets buys you the 2M band. I hope they sell the shorter whip antenna separately
yes I agree as well with the extension bar's, you could probably have the radial bobbin just under the loading coil for raised radials or have it at ground level, what ever suits the area the antenna is setup. I wonder if they would sell the radial bobbin separate that'll work with many of my portable antenna's.
@@adam-g7crq
Yeah its $50!
Looks like a good quality antenna that's gonna last long.
Cons: with shipping and tax its gonna cost more then my Yeasu ft-891 lol
if it compared to ranger 80 which makes the best?
i like my buddy stick.
Hey Josh.. in this video you seemed perplexed at the two extensions that were provided... you mentioned adding it on the whip side.. which I believe was incorrect.. I think ( which is dangerous for some LOL ) that the purpose of those were to raise the take-off angle of the antenna. If you add it to the base of the antenna (not the whip side) its may provide an increased range. This is similar to the Wolf River Coil setup that I have. 73 K3MOT Odessa, DE.
I was perplexed because that only raises the feed point. It doesn’t center load the vertical.
Could just adapt a “screwdriver” antenna like the Tarheel. Same concept only using a rotating inductor turned by a DC motor. Could also be remotely tuned.
Looks like a Super Antenna
But it’s not! 😎
HI Josh, Pleas does the tune sleeve turn around the coil for fine adjust ment, thanks Pieter, ZL1PDT
The fingers on the sleeve cover 360 degrees of the opening. There isn’t much of a turn you can do in those cases.
WRC has a similar design at much less $$. I know the WRC design has been around for a while as well, and has extremely great performance.
Not knocking CHA, but not sure an all aluminum enclosure is really needed, but maybe there is a market for it? I’m good with my WRC.
73 😉
It's ok to like something else! Everyone have their own taste! Some people like Ford Pinto and other likes Rolls-Royce! It's a personal choice!
@@Chameleon_Antenna Amen! I'm considering this antenna, and might compare it to my TW2010 (TransWorld Antenna) as best that I can. Both will be used for POTA. I'm a Ham who doesn't mind paying for great quality and use-case diversity. This means I enjoy the design and build of Chameleon products and greatly appreciate your R&D. If you're interested in sponsoring this comparison, feel encouraged to reach out.
Hiw about matching?
Hmm. Unfortunately I don't think you can bring the complete set up as a carry on an airplane since TSA might consider the spike a weapon since it's a solid metal pointy object.
Good review and presentation Josh.
I took everything but the spike on a plane. No issue.
@@HamRadioCrashCourse Hello Josh. I figured that you probably left the metal spike at home.
On a separate topic, I've been watching a bunch of your past livestreams. I have yet to find a video of you covering a topic of a beginner ham's tools. As a Technician, I've pretty much stayed with using HTs. I'm now studying to take the test for General Class so I can dabble in HF. I've watched your videos about certain brands of HF rigs you have reviewed but I have not seen any videos about handtools for beginner (i.e. SWR meter, coax crimping tool, soldering iron, etc.) who's considering making DIY antennas. Care to make a video of Top 5 (or 10) hand tools a new ham should consider investing in, in order of priority?
I am almost positive I have. Hmmm let me look into that.
Where do you purchase this when available?
Does it seem sturdy enough to handle the moment a 10 ft or 17 ft whip instead of the stubby little whip they sent with it?
Yes
Looks like the coil is covered in a clear plastic tube. They should mark their recommendations of length on the tube. Think how measuring cups are. Thats what I'm picturing.
No it’s not covered with any clear plastic tube!
Interesting. I’ll give it a try. I’m a Chameleon fan very good antennas, don’t think it will out perform the LEFS EFHW. Just saying…….
Can you fine tune by twisting the sleeve up or down the coil like on the WRC?
ONCE WE CLICK TO THE LOWEST POINT, THEN WE CAN TWIST CLOCKWISE OR COUNTERCLOCKWISE TO A PERFECT 1.1 SWR.
Yes indeed!
CHA PRV on backorder. Planning on uses now. I have a SS-17 currently and curious if it is worth my while to experiment using with the MCC. What is my expectation?
The CHA PRV is back in stock!
Either conditions on 20m were really bad or that antenna is massively worse than a lot of antennas. For a small footprint and being portable seems okay. Like you implied at the end, would be nice to see a comparison against a wire antenna and a standard vertical.
Also, these videos are great. Forgot to say thank you.
Which antenna analyzer do you recommend, Josh?
RigExpert
more specifically, which RigExpert do you prefer for field activations on HF?@@HamRadioCrashCourse
Stick 500.
How long is that whip? Is that an approx 7 foot whip, like the one on the Gabil 7350? Except a lot more beefy?
It’s the CHA SS58 = 58”
It's my understanding that the coil is made with stainless steel wire. I'd be interested only if the coil used thick silver plated SS wire to reduce RF power loss in the coil.
No it's Silver Plated Copper wire
@@Chameleon_AntennaSuper!
Have you tried the little tarheel II tunable coil antenna in similar set up on a ground spike...seems like it would work very similarly. I have mine installed on my truck right now...but was thinking of trying it on a ground stake to see if it will work in a similar manner. Curious to see if anyone has tried this alternate set up?
Would adding the CHA SS17 17’ whip improve this system vs. using the CHA SS58 58”?
It would likely reduce Q, but make the entrance top heavy.
You can use the SS17. It will be more efficient but a little harder to operate due to the weight.
ONCE WE CLICK TO THE LOWEST POINT, THEN WE CAN TWIST CLOCKWISE OR COUNTERCLOCKWISE TO A PERFECT 1.1 SWR.
That’s the idea of the system!
Great quality in this antenna, but I need 80 meters. Any add-ons for 80m?
There could be on the future. Unknown now.
YES - ALREADY WORKING ON THAT!
Nice review! What is the total length of the stainless whip with this system?
58 Inches... per the review on the HOAham channel.
IMO, the stainless steel whip (4.8') is far too short for half-way efficient use below 20M -- and that's being generous. The Buddipole long whip (9.5') or adjustable shock cord whip (13.5' or 17' version) are good alternatives -- and they are NOT stainless steel. Of course, the stainless steel CHA SS-17 is another alternative.
Very instructive video, as usual. Have you tried using the antenna on a mag mount? Would you use the vehicle as the ground plane or would you use the fixed length radials (48 inch) with it.
73 G0BXS
A mag mount for VHF/UHF on a vehicle shouldn’t require radials.
OK with that but was thinking about the Chameleon Portable Resonant Vertical (CHA-PRV) you tested in the video.
One major critique/suggestion: you always want to connect your impedance bridge/SWR meter/ antenna analyzer *directly* to the antenna feed-point using AS SHORT OF A LENGTH OF INTERCONNECTING COAX/TRANSMISSION LINE AS POSSIBLE. 1-foot or less is ideal for antennas operating in the HF bands.
Reason being: when the SWR-meter/antenna analyzer is connected to an antenna via a coax/transmission line that’s an appreciable percentage of wavelength at the frequency being measured, and there is a mismatch at the antenna feed-point, then there is a continuous impedance transformation taking place all along the length of coax/transmission line. Unless the electrical length of coax/transmission-line is an exact multiple of 1/2 wavelength, then the impedance characteristics being measured by the SWR-bridge/ antenna analyzer will NOT be the actual impedance/resonance condition at the antenna feed-point.
So… to avoid having different and conflicting coax-length-variable impedance match readings depending upon what final length of coax is used to connect the antenna to the gear in the shack, one needs to measure the impedance/resonance of an antenna at or very close to the actual antenna feed point (and NOT via undue length of coax) so that the actual antenna feed point resonance and impedance match of the antenna to coax/transmission-linecan be adjusted properly.
When the antenna is properly resonated and impedance matched to the coax at the antenna feed-point, then the coax/transmission-line will be operating in a true matched condition, which is known as a *flat impedance line* characteristic, whereby it doesn’t matter what length of transmission line to the shack is used, because a uniform impedance characteristic will exist all along the transmission line.
I hope this helps out.
-Thomas, Advanced-Class U.S. Ham for 30+ years
Try the Slidewinder DX. Cheaper and easier to tune … and longer whip ?
Easier to tune? Have you tried the CHA PRV?
I would like to see the "Chassis mount" have 4 screws instead of 2, would make it look finished
In the manufacturing world it’s not because you see a hole that you need to fill it! Two set screws are than sufficient to hold the PL-259 in place and provide great ground. It remove manufacturing time and cost. ALL our products ONLY use TWO set crews to secure PL-259.
I assume the added pole lenths is to make it a center loaded coil setup like you can with WRC or the BuddiStick Pro ..
Agreed
Exactly
You'll need to short the SO-239 to use as a center loading coil. Otherwise, it should work.
What's the power limit on this bad boy? (digital/full duty)
500W SSB and about 300W CW
How do you think it compares to the CHA MPAS 2? Better or worse performer?
WSPR Shoot Out between CHA MPAS Lite and CHA PRV on 20 meters!
CHA PRV (foreground), MPAS Lite (background) (Instagram Post)
WSPR Results for both antennas (20 minutes total)
CONFIGURATION
CHA PRV: Ground mounted with 2 12’ 6” counterpoises E/W
MPAS Lite: Ground mounted with 1 34’ counterpoise NE
RANGE: Northern Alabama
MODE: WSPR
POWER: 5 WATTS
CYCLES: 2 TX, 3 RECEIVE (10 MIN FOR EACH ANTENNA)
RESULTS (raw data file attached):
CHA PRV
TOTAL (TX+RX): 130
AVERAGE SNR (TX+RX): -13.77 DB
STD DEV (TX+RX): 9.72 DB (Standard Deviation is the dispersion of the results. If this data set normally distributed, this would mean that 68% of the values fall between the range of -4.05 DB and -23.49 DB).
TOTAL TX: (89)
AVERAGE SNR (TX): -13.74 DB
STD DEV (TX): 10.4 DB
TOTAL RX: (41)
AVERAGE SNR (RX): =13.83 DB
STD DEV (RX): 8.2 DB
AVERAGE DISTANCE (TX+RX): 2314 KM
MEDIAN DISTANCE (TX+RX): 1557 KM
MPAS LITE
TOTAL (TX+RX): 192
AVERAGE SNR (TX+RX): -12.56 DB
STD DEV (TX+RX): 10.21 DB
TOTAL (TX): 141
AVERAGE SNR (TX): -12.55 DB
STD DEV (TX): 10.98 DB
TOTAL (RX): 51
AVERAGE SNR (RX): -12.57 DB
STD DEV (RX): 7.8 DB
AVERAGE DISTANCE (TX+RX): 2933 KM
MEDIAN DISTANCE (TX+RX): 1567 KM (the median is a better measure for this value)
CONCLUSION: The MPAS Lite has a 1.2 DB advantage in TX SNR and a 1.3 DB advantage in RX SNR (1.2 DB overall).
The median distance communicated was almost the same.
The 1.2 DB advantage increased the average distance communicated from 2314 KM for the CHA PRV to 2933 KM for the MPAS Lite. It also resulted in 62 more reception reports.
The overall conclusion is that both antennas are effective portable QRP antennas with the MPAS Lite being better, but the CHA PRV performing quite well for its small size.
The CHA PRV has several reception reports from ZL’s and VK’s!
This also aligns with the good results from the David Crocket State Park POTA activation. My bottom line is that I will not hesitate to take the CHA PRV on POTA activations.
@@Chameleon_Antenna thanks. A lot of great info. I knew my MPAS lite was a great antenna. Now on 40m the tables would probably turn even though I use my MPAS on 40m with a tuner
@@Chameleon_Antenna Would have been interesting to see a third comparison with ground mounted CHA SS-17 and same length radials as PRV.
I love my MPAS 2.0 with cap hat, talked all over the world from Ireland on 20m mostly because it's the band that's open when I get radio time.
It's broadband yes but with 100w I never fail to make contacts on it, 80m and 40m are obviously lacking given it's length but I've made contacts on 80m with a tuner and on 40m all over Europe into Russia and middle East with no tuner. But 20,17,15,12 and 10 m perform really well for what it is.
I originally got the MPAS for portable ops but found out how well it works and decided to put some NOALOX on it to stop corrosion and it's been on my front lawn since 2019 and it's a very well used antenna, why use it just for portable when I can use it much more frequently as a 2nd setup in my sitting room ? I Use it with the FT-891 or lately with the IC-705.
The MPAS 2.0 also doubles as a fantastic low noise SWL antenna.
I wish Chameleon would make a larger vertical with better performance on 40m.
I have the Super Antenna MP1 and it's a good antenna too but running back and forth for tuning was a bit irritating.
I wouldn't be surprised if Chameleon came up with a remote tuning system for the screwdriver antenna, now wouldn't that be sweet ?
what about the 2 12" rods ?
What about it?
How would anyone rate this compared to the MPAS 2.0 antenna?
Very different animals/antennas. Mpas generally needs a tuner and this is physically adjustable.
Not da Craw! Da Craw!! 🤣
With the SS17 you get 80meters.
With just the SS17 you only get down to 20 meters.
And the coil.
Well that is not just the SS17 is it?
Give me skema to make loading coil for 11 meter band please
No need - the CHA PRV covers 11M.
Can it cook a hot dog?
I had a CHA mobile antenna, it was a dummy load! This one looks alright, but I'm surprised at how short the whip is, I was expecting to go way up. Even their website says it's 20ft extended. Do you reckon it would go the distance? Rubbing up and down would damage the shaft? ;)
How come you never put direct links to the products you test !?
Never?
Will this antenna work on my high powered 11 meter unit??
“And I have it!l
Ehhh.. kind of seems like reinventing the wheel. And the radial puck was already brought to market from REZ. Ripoff. Ill just stick to the tried and true WRC SB1000 and an EFHW. The size and construction quality are great, tho. But will it justify the price tag? Just my opinion.
I have an EFHW, but Wolf River Coils does not know how online sales work and I was consequently not able to order anything from them.
They already ripoff our MINI and MICRO base connectors and the SPIKE MOUNT.
@@denelson83That and the WRC will melt with higher power full duty cycle modes. Even their “higher power” version has issues. I’d rather pay Chameleon money for something that I can beat the crap out of and have it survive.
@@denelson83 That is a fair point. Kinda looks like Fred Flintstone himself had some input on that website lol It did take a bit for me to figure out what I wanted and how to get it. But the price is solid. Nothing's perfect. Everything has ups, downs, and trade-offs.
@@Chameleon_Antenna Interesting... The puck idea is clean, but I am partial to larger alligator clips for radial connections. Radials are then easily applied to different setups. Just clamp 'em on. Not as high speed low drag, though.
I wouldn't ever buy radials/counterpoise wires again, I'd buy wire and make my own.
Not all ham radio operators make their own radials.
just the lazy ones buy them @@denelson83
No doubt it’ll be sub 300 dollars, right?
The price of the coil alone is $350! For a whole kit its around $500! It may be a quality built product, but...
At the price they are asking for this vertical, maybe they could Gold Plate the coil and get less loss....lmao
Sheesh $680.00. I’ll home brew something🤪
Soooooo....would you buy this antenna with your own money????????? You asked that question multiple times but never answered it.
SO239? Who even uses those anymore?
Me
There are two types of people: those that use BNC and those that are wrong.