Re: {Collins} SDR Radio

Actually, an IF DSP, given that the demodulators are implemented in software, meets the definition of an SDR.  See

It is only recently that, for certain applications, downconversion and upconversion have been implemented in the sampling process to allow an almost all software-defined radio.  High power output and low noise high dynamic range input are still a challenge for all digital techniques.

Only my opinion, of course….



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From: Bill Carns
Sent: ‎Wednesday‎, ‎May‎ ‎13‎, ‎2015 ‎5‎:‎38‎ ‎PM
To: 'David C. Hallam', 'Collins List'

David,  I think you are confusing SDR (Software Defined Radio) with DSP
(Digital Signal Processing).
No way will you ever make a 75S-3, or any of its potential outputs, into a
SDR radio.

You can, though, use that pan adaptor I.F. output as input into some kind of
DSP processor and there are many available for both IF and AF level
Good Luck,


Bill Carns, N7OTQ (Trustee K0CXX)
Past President, Collins Collectors Association
Founding Board, Collins Radio Heritage Group
Editor, Signal Magazine
Wimberley, TX
512 618 2762  (Cell)
512 847 7010  (Home)

-----Original Message-----
From: Collins [] On
Behalf Of David C. Hallam
Sent: Wednesday, May 13, 2015 2:13 PM
To: Collins List
Subject: {Collins} SDR Radio

I would like to try SDR  with my 75S-3.  How would I go about a "starter"
set to see what it is like?  I have the 455 KHz output now for my Heath


The very essence of a free government consists in considering offices as
public trusts, bestowed for the good of the country, and not for the benefit
of an individual or party.
John C. Calhoun 1835

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