[amsat-bb] Re: DELFI decoded

Mark L. Hammond n8mh at embarqmail.com
Tue May 6 13:36:54 PDT 2008

Hi Bruce,

On my TS-2000x I find setting the LOW cut off around 200 Hz (or maybe 100 Hz) and the HI cutoff around 2600 (or maybe 2400) works pretty well on 1200 BPSK signals like Delfi-C3. 

Give that a try... you can go a bit wider (100/2600), or a bit more narrow (200/2400)..but 200/2600 should be pretty good. 


Mark N8MH

Date: Tue, 6 May 2008 12:04:48 -0300
From: "Bruce Robertson" <ve9qrp at gmail.com>
Subject: [amsat-bb] Re: DELFI decoded
To: "Viktor Kudielka" <viktor.kudielka at ieee.org>
Cc: AMSAT <amsat-bb at amsat.org>
	<49657a760805060804xcf5383ah2810ae488bff1db9 at mail.gmail.com>
Content-Type: text/plain; charset=ISO-8859-1

It is possible to tune for RASCAL by ear. I use the following steps:
1. Tune to find the frequency with the greatest s-meter reading
2. Listen to the tone part of the signal, not the raspy part, and aim
for a note much higher than a regular CW signal.
3. When the green sync light goes on in RASCAL, fine-tune to centre
the signal at 1600 Hz.

Does anyone know how narrow a SSB filter I can apply to this signal? I
have a TS-2000, which is quite adjustable. For now I'm using it wide
open. I know the centre signal is 1600 Hz, which is quite high. How
high/low do the sidebands go?

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