[Drake] RE: TR-7 Receiver Noise Question

Mon, 29 Mar 2004 08:00:39 -0500 (EST)

Jim,
Before you do anything drastic (or even simple) please read the TR7 mods 
here  www.dproducts.be/Drake_Museum/  Do a sight map, and look for the TR7 
section.  At the bottom of that section is an article reprint from 
Communication Quarterly magazine.  It has a simple audio modification 
specifically made for the problem you are discussing.

I am sorry that I can not get a better link.  At this time, I can not get 
to the site.  I know it is there because I have read it, and I have the 
original article as well.  Basically the s/n on narrow CW filters is poor, 
and a simple low pass audio filter will cure, AND all of the mods in the 
article are reversible.  The gentleman who wrote the article did an 
excellent job with his "no holes, cuts, marks" modification philosophy. 

BTW as anyone tried the QSK mod and can recomend a reed relay and diodes 
to sue? 

If you can not find the article, let me know I will find the specific link 
when I can get to the site again.

73,
Ron

-- 
============================================================
Visit my astronomy home page.   http://www.dma.org/~wagner
Amateur Radio Station: WD8SBB - Ron  and  KB8NRP - Joann
============================================================

On Mon, 29 Mar 2004 [email protected] wrote:

> 
> Message: 1
> Reply-To: <[email protected]>
> From: "Jim DiMauro" <[email protected]>
> To: "Drakemail" <[email protected]>
> Date: Sun, 28 Mar 2004 07:26:51 -0500
> Subject: [Drake] TR-7 Receiver Noise Question
> 
> Hi All:
> 
> My TR-7 exhibits a low level background noise that sounds similar to random
> atmospheric static.  The noise comes from inside the radio.  It's audible
> when a dummy load is connected, the RF gain is turned down and there's no
> external noise to mask it.  It's most noticeable (to the point of being
> extremely annoying) when using the 500 Hz CW filter; it's also present when
> using the other filters, but it's almost inaudible and isn't a problem with
> other modes.  It's independent of the audio gain control, so that's a clue
> as to where to start looking for the noise source.  Before I dig in, has
> anyone heard of this before?
> 
> Thanx & 73,
> Jim
> WA2MER