[Heathkit] Audio filter on HR-10B

[Robert & Linda McGraw K4TAX]

I've used the Timewave DSP-9+ in several applications.  They seem to work 
quite well although only being a DSP audio filter thus doesn't do anything 
for front end or IF overload.

73
Bob, K4TAX



----- Original Message ----- 
From: "TJRachwal" <tjrachwal at comcast.net>
To: <heathkit at mailman.qth.net>
Sent: Tuesday, July 04, 2006 8:03 AM
Subject: [Heathkit] Audio filter on HR-10B


> Hello all,
> After posting about mods for improving CW selectivity and other mods and 
> receiving many responses I decided to follow the advice of adding and 
> audio filter rather than making mods to the HR-10B.  It was a good move 
> and a very good suggestion.  I opted for the SCAF filter from Idiom Press 
> rather than the MFJ much cheaper filter.  The filter arrived within three 
> days (Oregon->Mihigan) and in about 15 minutes was hooked to the HR-10B. 
> Wow!  The performance difference is amazing!  It wasn't "quite" the same 
> as the 500 hz filter but leaps and bounds over the "wide as a barn door" 
> front end in the HR-10B.  I could copy CW stations clearly that were down 
> in the mud without the filter and not workable.
> Since I didn't have an MFJ to compare it against I can't say the SCAF by 
> Idiom press is any better but it has made the use of the HR-10B much more 
> enjoyable and I look forward to many FB CW QSOs with the DX-60B, HG-10B 
> and HR-10B.  By the way, an xtal calibrator (HRA-10-1) is on the way for 
> the HR-10B; station complete!
> HR-10B $80.00; SCAF wired and tested $140.00; enjoyable QSOs, memories of 
> days gone by....priceless!  Thanks to all for their advice and help.
> 73....Ted K8AQM
>
>
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