Re: [App_rpt-users] Hamtronics receiver issue with AllStar RTCM

Here is the schematic of the hamtronics output: amsatnet.info/r303out.png

Isn't R34 and C44 a lowpass??

I don't know what to make of your calibration errors as they don't seem to correlate to a HF roll-off problem, but to answer your question, yes, it's an RC low-pass filter, with a -3 dB corner at 2.4 kHz. You might want to replace the 0.033 uF shunt cap with 0.01 uF to flatten out the high end of the audio passband a bit. --- Jeff WN3A --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus