Amateur Radio Stack Exchange
Amateur Radio Stack Exchange

Questions tagged [antenna-analyzer]

13 questions
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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 currently own either an SWR meter or antenna…
David KF4MDV
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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 understand what it shows and what the graphs mean. …
progrmr
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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 (transportation and cost). Please guide me. The antenna…
Vaibhav Rekhate
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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) As the range was poor between my gateway and my…
DurandA
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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: looking for a manufacturer's replacement, but it's a…
Paul
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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 portable where I do not have PC available. A friend…
Pedja YT9TP
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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 equipment is the same, and I plan to work on the same…
Bartha
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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 up in USB devices. Also, and this is very strange:…
K8KV
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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 this isn’t an encouraging sign. Before I take the…
user2555403
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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 Photo 2 of 4: The Quad's SWR Photo 3 of 4: The…
abcd567
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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? Thanks!
CrossSlide
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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: f1 = 2110 f2 = 2155 2*f1 - f2 = 2065 2*f2 - f1 = 2200 this doesn't seem to follow…
steve
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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 separation and transmission loss for both ports. If I…
rodv92
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