[hpsdr] Excalibur Issues (fwd)

[John Koster]

Interesting.  Measuring 50MHz doesn't sound good.  Before I read that part
I was going down the path of multiple reference sources beating against
each other.  Don't remember all the s/w and jumper settings needed to
switch from internal 10MHz to Excalibur.  Kind of thought it was automatic
with current FPGA code and PowerSDR.

Might check the soldered connections, a bad joint might cause the TCXO to
act funny.

On Wed, 10 Nov 2010, Jeremy McDermond wrote:

> ***** High Performance Software Defined Radio Discussion List *****
> 
> I was working on some improvements to Heterodyne in the past couple of days, and noticed a significant warble to signals when I switched to SSB mode on the ham bands.  It's something that I could both hear (which made conversations unintelligible), and see on the waterfall (you could see what were supposed to be constant tones looking like sine waves).  I narrowed the issue down to Excalibur.  When I have it pulled, signals are okay, but when it's in the system, I get the warbling effect.  For fun and games, I set the Excalibur jumper to "external" without anything hooked up, and the warbling went away.
> 
> I took my MFJ-259B with a length of RG-58 cable stripped on the end to expose ground and signal (I know, not a real precision instrument) and measured the frequency at TP2 (the output of the Crystek), and was measuring 50 MHz.  I'm wondering if I have a bad TCXO, or whether folks maybe have other ideas (cue making fun of the software guy).
> 
> --
> Jeremy McDermond (NH6Z)
> Xenotropic Systems
> mcdermj at xenotropic.com
> 
> 
> 
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-- 
73,
John, W9DDD