On 3/27/16 5:12 PM, Skyler F wrote:
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.
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.
Does anybody else have experience with hamtronics receivers?
Yes, I have a number of them in place and find they work perfectly with the RTCM. It can give about 2v P-P on the discriminator pin, and has the high frequency compute the RTCM squelch needs. My prime setup is here: http://gallery.keekles.org/d/28384-2/0330141929a.jpg Note you'll want to put a cap in line, as the discriminator is DC coupled in the hamtronics. Can you put a scope on the discriminator line and measure the voltage? You might have a problem with the receiver. 73's -- Bryan Fields 727-409-1194 - Voice 727-214-2508 - Fax http://bryanfields.net