Questions tagged [antenna-analyzer]

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2 votes
1 answer
41 views

Rig Expert AA-35 ZOOM Amateur Band coverage in the United States

I am having difficulty understanding the low end of the AA-35 ZOOM frequency range. The tool can help with frequencies between 35 and .06 MHz. Looking at a chart I saw that 60 kHz was Standard ...
Radio Rails's user avatar
2 votes
1 answer
98 views

Diagnosing antenna problem with RigExpert AA-600

Last fall I put up a 40ft tower with a Diamond X50 dual band antenna at the top. This antenna had previous been mounted at the corner of my house with no issues. Since putting the antenna on the tower,...
Matt's user avatar
  • 21
1 vote
0 answers
40 views

RigExpert AntScope2 is missing Data popup

I recently started using AntScope2 and everything was great. But all of a sudden the Data popup has disappeared. The missing popup is circled in the photo. How do I turn it back on or get it back? ...
CrossSlide's user avatar
3 votes
1 answer
164 views

Do you need to analyse the SWR of your radio repeatedly? Or periodically? If so, Why?

Let us assume that I have an adjustable antenna, between 160m - 6m. And let's also assume that using an antenna analyser I have estimated the SWR for that antenna for a specific frequency. If my ...
Bartha's user avatar
  • 169
5 votes
3 answers
1k views

Measurement of antenna with VNA does not match its specs

I have a NanoVNA V2 Plus (50kHz - 3GHz) and decided to test my LoRa antennas: an unknown antenna delivered with a LoRaWAN gateway (RAK831) a 868Mhz antenna from Linx Technologies (ANT-868-OC-LG-RPS) ...
DurandA's user avatar
  • 175
4 votes
1 answer
942 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: ...
Paul's user avatar
  • 1,455
3 votes
1 answer
457 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 ...
K8KV's user avatar
  • 377
7 votes
2 answers
922 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 ...
progrmr's user avatar
  • 342
0 votes
0 answers
36 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 ...
rodv92's user avatar
  • 173
1 vote
1 answer
86 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: ...
steve's user avatar
  • 113
2 votes
1 answer
276 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 ...
user2555403's user avatar
3 votes
2 answers
783 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 ...
Pedja YT9TP's user avatar
1 vote
1 answer
827 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 ...
abcd567's user avatar
  • 389
5 votes
1 answer
3k 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 (...
Vaibhav Rekhate's user avatar
13 votes
5 answers
11k 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 ...
David KF4MDV's user avatar