[hpsdr] Why would "anyone" run a slower sample [sic]

[Mark Amos]

Mr Carcia,

I can think of a few reasons to run at a lower sample rate than 192Kbps:
- The processor load on my old ham computer is a lot less at 48K or even 96K 
(consequently fewer audio dropouts)
- I like to run both the FlexRadio and HPSDR at the same time, another reason 
for me to want to reduce processor load.
- I typically operate CW so 192K bandwidth on the panadapter is superfluous
- Also, I get a better pile-up spread on the panadapter at the highest zoom
- Filters at 48K appear to be considerably sharper

Is there some reason that you believe 192Kbps is the only rate that should be 
used?

An opto-isolator is a fine idea.  I use a transistor and a couple of resistors 
as a buffered switch for T/R relay isolation.

Good luck with the additional A/D heat-sink project.  I chose to use a muffin 
fan for additional cooling of the Ozy/Penny/Mercury stack.

Mark
W8XR


Message: 7
Date: Wed, 31 Dec 2008 13:31:27 -0800 (PST)
From: FRANCIS CARCIA <carcia at sbcglobal.net>
Subject: [hpsdr] Sample rate
To: hpsdr at lists.hpsdr.org
Message-ID: <863948.34939.qm at web82304.mail.mud.yahoo.com>
Content-Type: text/plain; charset="iso-8859-1"

Happy New Year,
Mercury got another good workout today. I do notice the A/D running pretty 
warm. I think I will solder some copper flashing?on the back of the thermal pad 
at?some point to pull more heat off the part.
I wonder why anyone would want to run a slower sample than 192 KHz? My computer 
is usually running below 10% CPU most of the time. Janus interface was higher.
Someone asked about out of band signals. As a test?I put two HP8640Bs into a 
combiner. Then I listened to a signal near MDS on 75 meters?and?tuned the 
second generator up to 8 MHz? at a level just below saturation. I never heard 
anything or saw anything on the?display.
frank?
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