Questions tagged [antenna-analyzer]

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3
votes
1answer
55 views

How can I replace the NiMH battery in an old RigExpert AA230 Antenna Analyzer?

I have an AA-230 Pro Antenna Analyzer. Its similar about 5-10 years old with a failing battery. The battery will only hold a charge for a day or so, and only for minutes while in use. I tried: ...
3
votes
1answer
41 views

How do I get my Windows 10 PC to consistently recognize my RigExpert AA-35 ZOOM?

I have connected my brand new RigExpert AA-35 to my Windows 10 PC via the provided USB cable, but the AA-35 does not show up in Device Manager. There is no COM port assigned to it, nor does it show ...
6
votes
2answers
132 views

What does an antenna analyzer tell me about these coaxial cables?

Note: more measurements added after graphs below I recently acquired a RigExpert antenna analyzer and I am trying to learn how to use it to test cables. I took two cables to start with to try and ...
0
votes
0answers
28 views

UHF cubical quad VNA analysis interpretation (part2)

This is the follow up to: UHF cubical quad VNA analysis interpretation This is a S21 and S31 analysis of an oversized 385 Mhz 50 Ohm to 90 Ohm balun between 100 Mhz and 600 Mhz I tested phase ...
1
vote
1answer
66 views

why is 3rd order intermodulation for 2110-2155 = 1710-1755?

Trying to calculate 3rd order intermodulation for a frequency range (2110 to 2155). I know the answer is 1710 to 1755, but I don't know how to get there. attempts: ...
2
votes
1answer
124 views

Faulty MFJ-259 - meter hits end stop on power up

I have a faulty MFJ-259, the early model I believe. When I power it up, the power light doesn’t illuminate, and the meter needles hit the right hand end stops. I immediately power down as I guess ...
3
votes
2answers
540 views

Is it possible to measure antenna trap with MFJ225 without help of PC?

I have MFJ225 antenna analyzer. I measure coax trap filters by connecting this analyzer to PC and using IG_miniVNA application. That works fine. But, sometimes I need to make such measurements in ...
1
vote
1answer
545 views

Why Coaxial Collinear Antenna Gives Strange Graph of Frequency Sweep vs SWR?

Antenna Analyzer gives a understandable results for a Quad Antenna (photos 1, 2 & 3), but gives strange results for Coaxial Collinear Antenna (photo 4) Photo 1 of 4: Test setup for Quad Antenna ...
4
votes
1answer
2k views

How to measure gain of an antenna?

I have dual stacked crossed yagi antenna. How can I practically measure the gain of the antenna combination? I know that this can be done in an anechoic chamber. But this is not feasible for me (...
10
votes
4answers
9k views

Is an antenna analyzer necessary for building antennas?

I'd like to try my hand at building a few antennas for VHF/UHF use. I'm going to be going approximately from established designs, but obviously the final result will require some tuning. I don't ...