<div dir="ltr"><div>For a voter project, we got the hamtronics VHF receiver pretuned to the repeaters input frequency. The idea is to use hamtronics receivers for every voted receive site for equivalent audio characteristics. </div><div><br></div><a href="http://www.hamtronics.com/r303.htm">http://www.hamtronics.com/r303.htm</a><br clear="all"><div><br></div><div>When hooked up to the discriminator on the hamtronics board, I could not get the RTCM to calibrate squelch. It usually told me the audio was too low weather the RX level was bumped up or down. I then hooked it up to a motorola SM50 and it calibrated shortly after adjusting RX levels.</div><div><br></div><div>So... I hooked a cheap sound card up to audacity, and took a look at the spectrum of each receiver. The hamtronics obviously looks like it lacks high frequency noise on the discriminator output. </div><div><br></div><div>Here is the SM50 discriminator out:<br></div><div><a href="http://amsatnet.info/SM50.png">amsatnet.info/SM50.png</a></div><div><br></div><div>Here is the hamtronics discriminator out:</div><div><a href="http://amsatnet.info/HAMTRONICS.png">amsatnet.info/HAMTRONICS.png</a><br></div><div><br></div><div>Here is an audio sample comparing them (you can probably guess which radio is first):</div><div><a href="http://amsatnet.info/Sm50_hamtron_DISC.wav">amsatnet.info/Sm50_hamtron_DISC.wav</a></div><div><br></div><div>Does anybody else have experience with hamtronics receivers?</div><div><br></div><div>Thanks,</div><div>Skyler KD0WHB </div><div><br></div><div class="gmail_signature"><div dir="ltr"></div></div>
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