[amsat-bb] Re: Frustration
rwmcgwier at gmail.com
Mon Nov 30 04:20:33 PST 2009
Do you have a 70 cm source of any type that you can use downrange to
prove that the system is working? That is, all together as a complete
system. If you can drive the source away until it is demonstrably
weakening, then you can test the beam pattern, etc. If the preamp
front end is hooked to a dummy load (non functioning antenna system in
front of it), then the noise from the dummy load will increase. You
need an external source.
Michael Tondee wrote:
> I definitely can heart an increase in noise when I power up the preamp
> and also see an S-meter response. Unfortunately I have absolutely no
> terrestrial repeaters within my range on 70cm. I've never been able to
> get into one even back in the days when I had my TS-2000X. Never been
> able to hear them either. Checked the preamp cables to make sure they
> weren't backwards also.
> In reference to some questions from others I've had, I am compensating
> for doppler on receive and I've checked all my cables except for the 40
> foot piece of LMR 400 for open or short with an ohmmeter.
> Just for giggles I decided to see if I could copy NOAA weather on 162
> Mhz band and I can. Don't know if that means anything. I will check my
> antenna pointing. Getting an accurate fix on true north has sort of been
> my achilles heel before but I've managed.There is not that much
> declination here. When I did happen to pick up the brief SO-50
> transmission last night the rotator was making a fairly large change in
> Azimuth though. I may just whip up a quick little groundplane to give me
> a baseline as someone suggested also.
> Thanks for all the responses I've gotten so far.
(Co)Author: DttSP, Quiktrak, PowerSDR, GnuRadio
Member: ARRL, AMSAT, AMSAT-DL, TAPR, Packrats,
NJQRP, QRP ARCI, QCWA, FRC.
"You don't need to see the whole staircase, just
take the first step.", MLK.
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