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Re: [linrad] A simple front end
I started recently with similar experiments aiming at building a simple
front end for Linrad with 40 Khz of radio spectrum in the 20 M band.
For that purpose I bought two weeks ago a board from Expanded Spectrum
Systems (ESS ) and a R2PRO kit from Kanga.
Both systems contain the building blocks you described.
Currently I only have the ESS solution up and running.
You can find a detailed description of this ESS solution with Linrad at the
website of Roger W3SZ.
My R2PRO-kit is still under construction.
----- Original Message -----
From: "W6WO" <ron-skelton@xxxxxxxxxxx>
Sent: Thursday, August 07, 2003 5:43 PM
Subject: [linrad] A simple front end
> I am keen to experiment with the "very easy way to get 40 kHz of
> radio spectrum into a PC" that Leif described in Fig 2 of the Jan/Feb
> 2003 QEX. My interest is only the cw end of 20 meters
> For an RF stage I plan to use a Mini-Circuits ERA-5 amplifier with a
> band-pass filter ahead of it. Instead of the quarter wave of coax the
> SPH-16 voltage controlled phase shifter looks like the way to go
> unless I can find a cheaper solution. I looked for low noise audio
> ICs that were not surface mount and the best I can find is the LM833.
> Initially I will use a signal generator for the LO but a crystal osc
> would make it a self-contained front end that could be packaged in
> quite a small box.
> I would like to share work of this kind with others, either via the
> list or direct.