Re: [amsat-bb] Local Anomoly

[Don Woodward <don@xxxxxxxxx>]

Do you set you PC clock with NTP so it's exactly on time?

Second possibility would be old KEPS.

73's

Don Woodward
KD4AP

On Thu, 2006-01-12 at 15:55 -0500, David Rush wrote:
> Earlier today I was trying to work SO-50.  I completed one QSO on SO-50 the 
> other day, have heard a few other stations, and had a partial QSO a day or 
> two ago, so I know my equipment is capable, if marginal, for working SO-50.
> 
> Anyway, while SO-50 was up, I was listening for other stations (I heard one 
> or two "out there", but not enough to copy a full callsign).  Then I tried 
> finding my own downlink, which I did (or thought I did).
> 
> The pass was nearly over, so I had manually adjusted for doppler: downlink 
> freq down to 436.7865 and the uplink up to 145.8516.  There I heard my own 
> signal.  Weak, but clearly there.  No noticeable delay, but I figured it's 
> a LEO, so not much expected.  Called CQ for a while, but no takers.  Well, 
> SO-50 went well past LOS and I was still hearing myself.  Huh?
> 
> Equipment: FT-736R and a dual-band Ringo Ranger, using a Comet duplexer 
> (antenna has a single connection while the radio has separate connections 
> for each band).  Yes, this is a nice radio with a relatively lousy antenna 
> system, but it's what I have right now.
> 
> Harmonic?  Well, 145.8516 x 3 = 437.5548, which is 0.7683 MHz away from 
> 436.7865.
> Intermediate frequencies for the radio are 455 kHz and 13.69 MHz, plus 
> 47.43 MHz on 430.  I can't find any combination of those that make up the 
> 768.3 kHz difference.
> 
> Nearby freq pairs where I can hear myself:
> 
> tx 145.840 and rx 436.760
> tx 145.850 and rx 436.781
> tx 145.855 and rx 436.792
> 
> But I cannot hear myself transmitting on 145.860 anywhere near 436.802 +/- 
> 20 kHz, nor 145.835 and 436.750
> 
> Any ideas?
> 
> David, KY7DR
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