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Diamond V2000A Upgrade
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- Опубліковано 18 кві 2024
- The Diamond V2000A is a fantastic tri-band antenna. Let's upgrade the radials and make it even better.
Note: upgrading the radials only changes your Standing Wave Ratio on 6m and does not significantly affect the already outstanding SWR on 2m or 70cm.
Written instructions on the Digirig help forum:
forum.digirig.net/t/diamond-v...
European V2000 upgrade instructions from EA4EOZ:
ea4eoz.blogspot.com/2012/09/m...
I've been curious about this, I've got a Harvest V2000 which is a clone of the Diamond... At the very end of your cut ( 4:55 ish ) leaving the die _STILL ON_ the element (or screw on a nut that thread size) cut that "boogered" looking end off straight and square with a hacksaw or dremel, then file the end to dress the rough edges up and tidy the threads. Then you can back the die off the element and clean the threads. Makes it MUCH less likely you'll Bork up the threaded holes in the antenna base or cross thread them! $$$
I appreciate the advice!
0:00 lol we have the same mouse pad mat, dad jokes and taste in antennas... I'm seeing a pattern here and I blame ham radio!😅 So brief back story... When I first got licensed I started out with a Firestik 5/8 λ _"2 meter band"_ ground plane base antenna, which BTW is also a great 2m antenna for longer range, with 6dBi gain on 2m. Anyway, dinking around out of curiosity, I tested the SWR for it on 70cm/440 and to my _surprise_ it had _WAY BETTER_ SWR on 70cm, dang near perfect 1:1 even though it's not at _all_ marketed for 70cm _ONLY_ 2m?! 🤔 Go figure? Naturally now I take what the sales/marketing "says" with a grain of salt!
Fast forward... A new 220/1.25m band repeater is in the area, so I threw the V2000 on the VNA just for giggles and... surprise, surprise, it was a still workable 2:1 SWR at 224 Mhz?! Now I'm curious, what's your VNA say your "modded" V2000A reads for SWR on 220?! 😁
Everything about this comment is awesome. I'll go grab my meter and check the SWR on 1.25m.
4.146 @ 222, 3.945 at 223, 2.989 at 224, 2.132 at 225
However, nearby at 202 the SWR is 1.136, and at 204.6 it's 1.113. The node below 1.5 stretches from about 201 to 205. Sadly, not in the amateur band.
@@TerminalElement The repeater here is on 224.12 MHz... And I discovered another nuance to antenna design from that old Firestik antenna, your ground radial lengths are directly _tied_ to your SWR! 😅
I found that out after a tree branch snapped a radial off, losing about 1/4". With the dip in SWR @ 201 to 205 that should mean the radials are a whisker too long for 220 if I'm not getting that bass ackwards? I've yet had but one cup of coffee so... They're possibly less than a 1/4" if not 1/8" or so too long? Still have scraps left from those first radials you tested?
@@macgyver5108 I don't have them anymore. But, I can confirm changing radials doesn't alter the SWR on 2m or 70cm, so it must be only 6m/1.25m.
Pardon me going off the topic of this video, but I have a question for you. A mutual friend mentioned you are into Raspberry Pi, so figured I would run this by you. I'm consodering changing up my mobile kit for JS8Call, using a Pi. There are several different versions of the hardware, as well as operating systems. In your opinion, what is the best one to run for JS8. Also, which OS would you suggest for someone that is a Windows shop?
No prob. Caveat: we have successfully used JS8 over VHF with the Pi's, but I do not have extensive experience with running JS8 with CAT control on a Pi (my HF computers are windows). I also don't have any experience yet with the new Pi Model 5, but I have read that the Pi 5 with Bookwork OS runs JS8Call just fine.
If I were setting up a system like you're describing, I think I'd try out either that new Pi 5 (note the greater power consumption specs for the Pi 5 may make it more difficult to power without a 110v outlet. The pi models 2-4 are difficult enough to power straight off of a DC system as it is), or I'd get a Pi 4 with 8 gb of RAM. JS8 seems to need a lot of processor power to decode incoming signals, so Pi models 2 and 3 appear to be disadvantaged with that software (although VK2SKYs info on PSKReporter shows he uses a Pi 3B+ with JS8 and that guy's station obviously works great on 40m).
On the Pi 4, I prefer the older Bullseye OS over Bookworm. Bookworm ran JS8 great for me on the Pi 4, but FLDIGI lagged like a dead horse. If you don't plan on ever using FLDIGI then you're probably fine using the newer Bookworm, although it would be a shame to lose the option of using the FLDIGI suite of programs for photo and file transfers. There are of course other operating systems that can be flashed to the RPi with their SD card flasher software, but I don't have a lot of experience with those so I can't advise. As far as a comparison to windows, the GUI interface of Bullseye and Bookworm are similar enough to Windows that the experience should be comfortable to a windows user, with the understanding that there are enough differences that the transition still mandates additional learning.
If you do use Bullseye OS, there is an issue with selecting sound cards in JS8. KJ7VWV taught me a command to run in the terminal in order to download some additional software that it needs in order for you to be able to select sound cards in JS8, and I've included that info in the Pi Setup checklist linked on the About section on my channel.
The Pi's are all a compromise. The small package and low power consumption of the older models are appealing to me. None of them are terribly fast by modern standards, but they seem to do the job okay. Please let me know if I answered your question. I've got other videos in this playlist consolidating the setup information, in addition to the setup checklist that I put together. Learning how to do this - as a person who does not work in the tech industry and was new to Linux - felt like reeling up a log off the river bottom. My goal is to make the process a whole lot cheaper and easier for others than it was for me.
@@TerminalElement Thank you for the detailed response. I'm thinking I will give the Pi 5 a shot, and see if I can tie it into my existing portable power supplies. I was considering running a tablet like a Microsoft Go 3, but I like the form factor of the Pi. Anyway, I appreciate you taking time out of your day to respond. I'll let you know how it works out.
@@PartisanCommsGroup Hey! A radio engineer just showed me today the device he uses to power his Pi 5s off grid. The brand is Tobsun, and on it is written "25W DC-DC CONVERTER" Input is 12 or 24v, and output is 5v 5a. It's a small black semi-cube with four silver screws on the bottom - two for pos/neg input, and two for pos/neg output. I think the model name is EA25-5V but I'm not certain.
@@TerminalElement Thanks for the heads up. I'll look into that.