SDR has clear strong signal, 2 Meter ham rig has bad signal using same antenna

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KM4OVZ
Posts: 1
Joined: Thu Oct 10, 2019 4:50 pm

SDR has clear strong signal, 2 Meter ham rig has bad signal using same antenna

Post by KM4OVZ » Thu Oct 10, 2019 4:54 pm

I have an RTL SDR and a Kenwood tr 7400a 2 meter ham radio. Using the same antenna in the same location, the SDR gets a clear full quieting strong reception of my local 2 meter repeater. The ham rig gets a low, bad, staticy reception but good full quieting transmission into the repeater. The gain on the SDR is at full +49db. How can I made the ham radio get the same reception as the SDR? I cannot adjust the gain on the ham radio I don't think.

alanzfq
Posts: 56
Joined: Thu Oct 04, 2018 11:18 am

Re: SDR has clear strong signal, 2 Meter ham rig has bad signal using same antenna

Post by alanzfq » Thu Oct 10, 2019 8:46 pm

My first thought is that your TR7400 is faulty.
It would be the first time a RTL was better than a good proper radio.
Alan

snn47
Posts: 178
Joined: Tue Dec 27, 2016 11:00 pm

Re: SDR has clear strong signal, 2 Meter ham rig has bad signal using same antenna

Post by snn47 » Fri Oct 11, 2019 7:16 am

Always check the transmission line (cable, switches and ...) first.

Did you check for faulty distribution, meaning exchange the two receiver, connecting the TR-7400 to the cable you used for the SDR and the SDR to cable previously used by the TR-7400?

nospam
Posts: 11
Joined: Tue Jan 03, 2017 10:08 pm

Re: SDR has clear strong signal, 2 Meter ham rig has bad signal using same antenna

Post by nospam » Fri Oct 11, 2019 7:20 pm

Besides possible antenna connection problems something could have blown out the front end receive transistor/fet of your handy talky. I would think even the lowly uv5r would have a better receiver than a dongle.

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