[amsat-bb] Re: [Hearsat] Opinions on receivers
Loren Moline WA7SKT
lmoline at hotmail.com
Tue Oct 6 20:48:28 PDT 2009
One other thing I have found is that the tracking of the varactor tuning may not be as good as it once was. As far as the capacitors I looked at my receiver and being a newer production it does not have the same DC board as the older serial numbers. My DC board looks good and I scoped the DC lines and they are clean..
I have more testing and possibly a re-align of the bandpass filters to do but for now the receiver is ok...
I want a second receiver and thats why I asked about receivers.
Member: ARRL and Pacific Northwest VHF Society
Member: Hearsat Satellite Monitoring Group
From: ko6th_greg at hotmail.com
To: smeuse at mara.org
CC: amsat-bb at amsat.org; lmoline at hotmail.com
Subject: RE: [amsat-bb] Re: [Hearsat] Opinions on receivers
Date: Tue, 6 Oct 2009 20:41:20 -0700
REALLY? Great tip! It's never been a great receiver, but anything will help.
I'll do some Googling around, but would you happen to have a pointer to more detailed information on the repair?
> Date: Tue, 6 Oct 2009 23:24:49 -0400
> From: smeuse at mara.org
> To: ko6th_greg at hotmail.com
> CC: amsat-bb at amsat.org; lmoline at hotmail.com
> Subject: Re: [amsat-bb] Re: [Hearsat] Opinions on receivers
> Greg D. expunged (ko6th_greg at hotmail.com):
> > But, as a general coverage receiver or scanner, it's 20-year age clearly shows. First of all, it's a bit deaf by modern standards. The local NWS weather channel is an S6 or S7, being fed by a very large TV antenna, with Preamp, in the attic. It's full scale on my HT with its rubber duck antenna in the shack. My S-band equipment (Drake 2880, and all that) barely gets above S1 or S2. You get the idea.
> Keep in mind that the lack of receive sensitivity in the R7000 most likely is due to old leaking electrolytic caps. Specifically, there is a DC-DC converter board on the underside of the receiver that ends up generating broadband noise as the caps fail over time. I recently rebuilt this board and have regained nearly all of the sensitivity that I've lost. I suspect that if I replaced more electrolytics I could have it back to factory specs.
> N1JFU - http://n1jfu.blogspot.com - smeuse at twitter
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