You can now help support WorldwideDX when you shop on Amazon at no additional cost to you! Simply follow this Shop on Amazon link first and a portion of any purchase is sent to WorldwideDX to help with site costs.
I own Megawatt 4000 and it works fine with tuned coil.
With original coil swr readings was not good anywhere.
Measured with antenna analyzer.
Same issue with 5000.
Can you tell gamma match lenght?.
Is it near to bottom when you get that result?.
Maybe you have to shorten top section to get lower swr on 27.405.
1:1.0 can be archived fine tuning.
I have tuned with antenna analyzer.
Just finished my tx measurement and warning!.
Do not tx under 136MHz without hw modification.
50MHz tx 2nd harmonic 100MHz is stronger then 50MHz signal!.
70MHz tx 2nd harmonic is equal to tx freq !
WFM rx is prety good.
I can receive radio stations from Kalix Sweden about. 160km away from my qth with Nagoya NA-775 antenna
Also air band works better with NA-775.
AM audio cracs some times when signal level chances , but that is not a big broblem.
Received 1 today.
Original antenna in poor.
I first tested firmware mod from https://whosmatt.github.io/uvmod/
But no tx lower then 136MHz.
Then https://github.com/Tunas1337/UV-K5-Modded-Firmwares
Opeded tx .
Now i have to do some hardware modifications.
RM703 is 16 fet amp.
I think there is some fet burnt.
You can test fets with multimeter.
If you chance all fets dont use IRF520
IRLZ14 is the right fet.
Old topic but must reply.
I Have owned several different antenna analyzers.
First was MFJ 259 and 269.
Then Comet Caa-500 and i liked a lot.
Comet was better then MFJ.
But then i started to build 4G yagis and need high freq.
I bought AAI N1201SA 34-2700MHz and AAI N2021BA 1-200MHz vector antenna...
Hi.
I have one 124cm long Abbree.
It should be VHF and UHF but not work well with PMR446.
So i tested it with vector antenna analyzer and result was a surprice.
Best swr can be found 140, 200, 300, 420 and 460MHz.
Maybe have to cut a bit.
I hope this information hepls someone.
My opinion about install height is 11m band vertical quad it have to be about 30m hi on the ground.
Then beam cant see near trees or buildings etc.
If you havent tested you cant know.
I have build and tested quads over 25 years.
This forum does not allow a single user to have more than one username. If anyone wants to change their username contact an admin and it will be done. Multiple accounts belonging to the same member will be deleted without warning.