[App_rpt-users] Hamtronics receiver issue with AllStar RTCM

Jeff DePolo jd0 at broadsci.com
Mon Mar 28 14:56:20 EDT 2016

> 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 

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