Hello guys,
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.
Loren WA7SKT
Member: ARRL and Pacific Northwest VHF Society Member: Hearsat Satellite Monitoring Group Location: CN86cx
From: ko6th_greg@hotmail.com To: smeuse@mara.org CC: amsat-bb@amsat.org; lmoline@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?
Thanks,
Greg.
Date: Tue, 6 Oct 2009 23:24:49 -0400 From: smeuse@mara.org To: ko6th_greg@hotmail.com CC: amsat-bb@amsat.org; lmoline@hotmail.com Subject: Re: [amsat-bb] Re: [Hearsat] Opinions on receivers
Greg D. expunged (ko6th_greg@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.
-Steve
N1JFU - http://n1jfu.blogspot.com - smeuse@twitter
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