[Premium-Rx] Spectrum display

[Carcia, Francis A HS]

I built a home brew I/Q converter with a double balanced tayloe to hang
off my RA6830 IF 
Pretty cool stuff. I used a color burst crystal to give me a 7.625 KHz
IF I/Q 

-----Original Message-----
From: premium-rx-bounces at ml.skirrow.org
[mailto:premium-rx-bounces at ml.skirrow.org] On Behalf Of Al Klase
Sent: Sunday, November 19, 2006 12:56 PM
To: Leigh Sedgwick
Cc: premium-rx at ml.skirrow.org
Subject: Re: [Premium-Rx] Spectrum display

Hi Mike,

The problem is, you probably don't have the appropriate hardware to get 
the signal into the PC.  (High-speed A to D).  I think the best you can 
hope for is to build a down converter to move the 455 range down to 
audio and come in through your sound card.  You'll be limited to about 
an 18-20 KHz bandwidth.  This is what the
DRM guys are doing. 

A premium receiver can give you an advantage here.  In the case of my 
6790, I set the mode to CW, bandwidth to 16KHz and the BFO to -8KHz, and

run the audio line-out into the soundcard..  Works pretty good, but 
there are some images from the other side of the BFO.  I'm using this 
with Dream software.  It's free and does both digital (DRM) and analog 
(AM, FM, CW, SSB) detection plus spectrum display.  See:  
http://drm.sourceforge.net/

Could go on and on,
Regards,
Al



Leigh Sedgwick wrote:

>Howdy All,
>
>A few weeks back there was discussion regrading spectrum display
software 
>but I deleted the e-mail.  I want to pan display over a specified
frequency 
>range using the 455 kc IF output from various receivers I have.  Could 
>someone point me in the right direction.  Google just turns up a bunch
of 
>audio spectrum software.
>  
>

-- 
Al Klase - N3FRQ
Flemington, NJ
http://www.skywaves.ar88.net/



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