[Premium-Rx] RA6790 alignment done....noise blanker info?

[John Reed]

----- Original Message ----- 
From: "Paul" <radioboy at telus.net>
To: <premium-rx at ml.skirrow.org>
Sent: Monday, December 12, 2005 9:15 PM
Subject: [Premium-Rx] RA6790 alignment done....noise blanker info?


You can buy copies of this article from the National Radio Club archive site 
at:

http://www.nrcdxas.org/catalog/reprints/

The chip, Allegro Microsystems ULN3846A is no longer available.  There is an 
SMD replacement for it but I don't have the designation for it.

John Reed

> Hi group,
>
> Just wanted to let you know that I have finished the repair/alignment of 
> my
> RA6790GM. As it turns out, the A2 mixer FETs were fine (thank goodness) 
> and
> it was a combo of the A2 alignment and the main IF, A4 alignment being 
> off.
> I used both the alignment instructions from this web site reference 
> section,
> plus some info emailed to me from Frank. Thanks for your help Frank, and
> others. It's back in the rack and working perfectly.
>
> I have found reference to an article written in 1995 by Dallas Lankford
> regarding a noise blanker circuit he designed for the 6790 using an 
> Allegro
> Micro chip. Does anyone out there have it and could you please email it to
> me if you do? I would like to look at it as one of our neighbors has just
> installed an electric fence....you know the kind that goes tick in the
> night. :-)
>
> Thanks again for all of your help. It's a great group.
>
> Paul
> VE7KHz
>
>
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