[aprssig] Receiver overload issues with Kenwood TH-D72

Brett Friermood brett.friermood at gmail.com
Fri Feb 8 10:21:20 CST 2013


Trying the dummy will help you determine if something is indeed getting
overloaded. However, since it is not working in both directions I'm
thinking you're audio levels in the TT4 are not adjusted properly.

Brett KQ9N
On Feb 8, 2013 11:07 AM, "Andrew P." <andrewemt at hotmail.com> wrote:

> Greetings, all.
>
> I was conducting some software tests that required passing data between
> two stations to ensure the data would be transmitted and received
> correctly. So, I had my transmitting station (Alinco DR-135T mobile and
> Byonics TinyTrak 4) and receiving station (Kenwood TH-D72 HT) sitting on
> the bench, both tuned to the same idle simplex frequency (I picked a quiet
> frequency not used for anything in my area), with the Kenwood HT about 1
> meter from the Alinco's antenna. When I transmitted packets from the Alinco
> to the Kenwood, I could see the transmit indicator on both the TinyTrak and
> the DR-135T, but the TH-D72 would only occasionally squawk and acknowledge
> receipt of the packet (about 15% success rate). Transmitting in the reverse
> direction had an even lower success rate (zero packet detections at the
> receiver).
>
> Could it be I was overloading the radios' front ends by being too close to
> the other radio's antenna? I made sure to use the factory "rubber duck"
> antenna on the Kenwood to minimize gain, and even turned the HT on its side
> to ruin polarization, but that didn't help.
>
> Any suggestions (other than getting help because my arms aren't long
> enough to reach both rigs further apart)? I'm considering replacing the
> Alinco's antenna with a dummy load and depending on leakage to conduct the
> test, but I'm not sure if that will help.
>
> Andrew Pavlin, KA2DDO
> Sent from my Verizon Wireless BlackBerry
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