Re: [HCDX] SPR4 Audio Help

["Bjarne Mjelde" <bjarne@xxxxxxxxxx>]

Hi Patrick,

I did the same mod when I bought my SPR-4 back in 1979 - and the audio  
quality was just as awful.  In fact the audio quality was the main reason  
I and the SPR-4 parted some 15 years later.  Maybe a highpass audio filter  
might be helpful - I assume if you can clean up the lowest 2-300 Hz the  
audio quality should improve.  Should have steep edges though.


-- 
 From The World's Northernmost DX-er
Bjarne Mjelde
Berlevag, Arctic Norway
www.kongsfjord.no
weblog: mjelde.blogspot.com

På Mon, 28 Nov 2005 10:28:11 -0800, skrev Patrick Martin  
<mwdxer@xxxxxxxxx>:

> Greetings everyone,
>
> Recently I got the mod done on my Drake SPR4 so the 2.3 crystal filter
> will work on AM. The filter is very good. In some cases comparing the
> R/C filter, also 2.3 khz on the R8, the SPR4 does better. It is amazing
> hearing the difference.  But the problem I now have is the audio on the
> SPR4 is so muddy that understanding is hard to do in many cases. In
> comparing the 2.3 khz crystal filter in the old SP-600 I had, the audio
> could be adjusted with the crystal phasing, which the SPR4 does not
> have. The notch filter helps a bit. I do have an old Radio Shack graffic
> eq that I could run the audio through. Any suggestions on cleaning up
> the SPR4 audio?  Thanks.
>
> 73,
>
> Patrick
>
> Patrick Martin
> Seaside  OR
> KAVT Reception Manager
>
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THE INFORMATION IN THIS ARTICLE IS FREE. It may be copied, distributed
and/or modified under the conditions set down in the Design Science License
published by Michael Stutz at http://dsl.org/copyleft/dsl.txt