Laird 450-470MHz 5/8 over 5/8 wave no ground plane antenna. Testing on GMRS repeater frequencies.
Вставка
- Опубліковано 30 лис 2018
- Laird 450-470MHz 5/8 over 5/8 wave antenna. Testing on GMRS repeater frequencies.
assets.lairdtech.com/home/bra...
To help support this channel donations can be made at. / mikesradiorepair or through PayPal at paypal.me/MikesRadioRepair
Great video. I've been watching gmrs videos for weeks. This is probably the best one about antennas. Thank you!
They are good compromise antennas. Is it perfect, no. No antenna is. I know several people that use these mounted to their window air conditioner, on top of their refrigerator, setting on the floor in their attic or on a shelf on a bookshelf. Since it's a no ground plane design it's not picky about what it's setting on. I actually ran around for almost a year with this on the roof of my 1 ton van and noticed no difference in performance compared to the normal ground plane version of this antenna from Laird.
This is one of the better GMRS videos that are not trying to push Midland products. Breath of fresh air!
Yes Midland is junk! Theres a reason why Laird and Larsen are commercial and only used by police emergency and other government enties!
Awesome thanks Mike. Thanks for the info on GMRS realm. This is one of those items we were talking about. Looks like it work with our work truck.
I bought a browning. Measured the diameter of the antenna rod, .2.5 mm. Ordered 2.5mm stainless rods from Amazon. Now if I make a cutting mistake, I have ten more rods to go. I can also make a seperate cut for uhf ham frequencies. . Have a Nagoya ut-72 that comes more tuned for GMRS. I cut and tuned a rod, again 2.5 mm for UHF ham frequencies. Now have 2 dual use antennas. I hold a license for both.
Personal favorite is the Laird TRAB4500NP antenna. Use them a lot for control stations, often a simple L bracket for the mount. Unity gain without a ground plane, 3 dBi with antennas. Not for working DX but for interfacing with local repeaters works great.
Often I mount these to metal structure in metal framed buildings.
Great details … thx
Hi Mike, Nice video. I recently picked up the 4503 (5/8 wave version) and 4505 (5/8 over 5/8 what you have in the video) and have a Laird magmount also. Locally I have tried many repeaters using both of them on the car and found the 4505 to be a little better but I also have a Laird 1/4 wave which is what I have been using and seemed to do equal or better in some cases than the 4503 but the 1/4 vs the 4505, I found the 4505 to be 6 db or 1 s unit stronger on one repeater and about the same on others. So it really depends on the application. Of course I am up here in Williamsport, PA where high mountains are typical, it just depends. 5/8 over course typically work better in the flat lands and 1/4 better for mountain areas with the high angle of radiation.
I have a browning 180. 2 meter antenna. ..works real good..
I got the same antenna with a tram 1265R base. Cut antenna off about 3/4 inch swr is 1.01-1.02 and can talk on
repeater 30 miles away from my living room.
Nice video Mike, informative too.
What could the expected range be
for this antenna with a 5 watt HT?
I know, too many variables!! But a
rough estimate would be okay for
a mobile & set up as a base.
Norman in Montreal.
I am guessing it probably uses an inner shielding on the coaxial cable as the ground plane.
hey mike would you consider reviewing a anytone termn-8r hand held 6 band radio? they look like a great radio for the money very flexable. ty
You really crack yourself up...
New to all of this but I'm thinking of installing a base unit/power supply on a shelf in the back of my closet. The closet is for storage only and does not get opened very often. Don't want to drill through the ceiling and into the attic if at all possible for the antenna. Can the antenna reside on the same shelf or should I put it on a higher shelf? Would you recommend the Laird (with or without the ground plane) for such a configuration and what problems could I expect to encounter, if any? Thank you.
I only use Laird antennas for my HAM uses.
I get a security risk warning on that link to Laird Tech.
yeah where i am uhf cb has taken over hf cb. less range but smaller antennas. so its like a more mobile thing.
i like Happy match
I am still trying to work out how it works without a ground plane and as it is 5/8 over 5/8 wave has got me, the only thing to give it a ground of any kind is the braid part of the co-axial cable. Tidy antenna and nice looking though.
It's a vertical dipole where each arm is 5/8ths the wavelength. Ground isn't required as it is a 'balanced' antenna already. Essentially 'one arm' of the dipole supplies the ground plane. It probably has a balun at the base to impedence match, so that's all it needs. All this would need is a 12x12 bit of ANY metal (including a tray, cookie sheet, anything really... aluminum foil, lol) under it if it were the type that required it.
@@mindmaster064 Co-linier antenna.
I have a midland 5001z. Cb radio.
Tweak & tune with frequency line up. ...out of the box real bad. 4 miles and muffy sounding. ..
Now clear as a bell. ...normal receive now after tweak and tune. About 8 miles on average. If somebody running a amateur radio and putting out 35 to 40 watts. .I can receive that single up to 14 miles....YOUR THOUGHTS ON THE MIDLAND RADIO. ..
MIKE FROM MINNESOTA (MINNESOTA CORN BREAD )
Question how do you plug it up to your radio?
Would there be any benefit to cutting smaller lengths from voth the top and the bottom? (Rather than only removing all thr length from bottom portion)
Many mobile antennas have a tip designed to discharge static electricity. You DO NOT want to cut that off. That is why you'll see radio guys cutting from the bottom.
There is a filter at the bottom of that antenna. If you talk dirty. Will you have to clean that filter?
The Antenna in this video is : Laird B4505CS (No Ground Plane) or B4505C (Ground Plane)
What model mfj meter were u using for that gmrs antenna test?
Model MFJ-847. It's printed on the front of the meter below the display.
What would happen if you added a ground plane or put the mag mount on a car
dbi no doubt.
Do we know the antenna mount part #? Is it that Laird magnet mount?
Mike, I love your videos!!! Are you familier with and what do you think of the following Galaxy radio: GALAXY DX 959B SSB 40 CH CB RADIO, SUPERTUNED ON OUR OSCILLOSCOPE & SPECTRUM ANALYZER, ((SKIP TALKING^^^SKY WALKER)), 35-40 WATTS PEP OUTPUT LEVELS, HIGH RECEIVE KIT, POWERFUL!!! I found this radio listed on ebay. What do you think of the Modification done to it?
Hard to comment on a radio or it's modifications if I don't have it in front of me to analyze. In general if it's been "peaked" and "modded" then I would probably avoid it. If it's pretty much stock with only a transceiver alignment done to it then it's probably fine.
@@mikesradiorepair Thanks for the fast reply, I think I will just buy a stock radio and send it straight to you for an alignment & mods so that I will know what I'm getting. If you have a large back log of work, I'm willing to wait. Thanks
What bands is the Ailunce HD1 FCC Type Certified on? When I look up what appears to be the FCC ID, nothing shows up.
Midland and others make a 3db gain ghost antennas that are only a few inches tall. They are truly invisible to any sort of HOA or apartment restriction.
They are very small but I seriously doubt they are 3db gain. Those are only good for close use like people traveling together on the road/trails. You would be better off using something like the one on this video or a GMRS base antenna and disguising it with something like a plant.
What is the component that separates the 2 5/8 antenna called? I have been trying to figure this out for a while now.
It's commonly called a phasing coil.
MikesRadioRepair Thank you.
@@mikesradiorepairI love your work. How do I get in touch with you Mike?
I didn't know that you could use the Ailunce HD1 on GMRS. I hated carrying 2 radios. I can program GMRS in my Ailunce and drop the Wouxun KG 805. Good deal!!
His information is incorrect, the antenna part number he is giving is a ground plane antenna that requires a metal ground plane, Laird b4505cn is the no ground plane antenna
Nice I have a Browning for gmrs . I got a 1:01 match is that good ? I have a tram 1140 with 50 foot of lmr400 . I also use a yeasu ft3d mod . But is 1:01 good
I've often wondered if there is really any difference between the Laird and Browning/Tram versions of this antenna. I know that Laird is generally higher quality products. Another confusing thing is that Browning has 2 versions of it. They have a br-173 & a br-450 both look the same and have similar gain but they don't explain what the difference is.
@@timtaylor8557 There is also a vx30a base atenna .I have one on my 2nd base . Just as good as the tram .
@@timsmith9169 That appears to be for 70cm and not tunable. Not sure how good that would be for GMRS.
@@timtaylor8557 the browning I tuned 1:01 the tram was done by the clubs master tech . As from the vx30a I was told it was per tuned I can hit all 3 repeaters .they are around 50 miles apart . I will have to put a meter on the vx
How's the bandwidth? OK, I asked too soon. Not too bad.
Isn't the static mat conductive? It should act just like a rf ground right?
What about an 9:1 UNUN driving a piece of copper pipe the height of the house and the ground going to a ground spike driven into the soil, would that work.
I have found using a 9:1 Unun feeding twin lead end fed half wave dipole half wavelength to the frequency above ground (earth) to be ideal for the given frequency.
With what your describing, I'am thinking your talking about a using the ground radial as a "counterpoise" in a vertical polarized installation, which will work as well, as long as your ground is the same length as the radiator (quarter, half, three quarter etc...) your actual RF antenna ground will be at the box where the (balun matching network) is housed in, If I'am understanding your question and description correctly?.
There is a Ham operator and author Stan Gibilisco ( W1GV) who has literally dozens of you tube videos and many books available, very, very easy to comprehend regarding all forms of antenna designs, balun winding tutorials etc...which I highly recommend to both novice and advanced antenna builders. You can also Install an app " Amatuer Radio Toolkit" which covers practically every frequency of radio communication antenna subject e.i. verticals, horizontal, dipoles, inverted V's, quads, Yagi, ground planes. All that you need to do click on antenna designs desired, frequency and wavelengths desired and the app will calculate everything necessary to construct the antenna. It also covers inductance, capacitance, resistance etc...
Math doesn't lie.
I have never heard of that antenna,, what is the company phone number?? thank you. 02-18-2019.
I would go to home depot and get a full size empty paint can for that lol
(cough)stop sign(cough).
@@matthewdavies2057 cant put a stop sign on a table lol. A paint can is at least 6 inches tall.
All i could read was MFJ. What freq range does it cover? And because of your review i plan on buying a president mckinley when i get my tax return. And a 15 watt midland micromobile radio lol
www.mfjenterprises.com/Product.php?productid=MFJ-847
Laird B4505C
Im broke. Have little money. I have seven.antennas laying around
@Phil Shnieder Sharpen them into rapiers and become a highwayman...
Isn't GMRS 1/4 wave
your brains quarter wave
dont use that info. i cut mine long according to the chart on the 1st one o bought. it was too short.
operator error! Cut 1/8 inch at a time only!