OK when this thread first came out I was reminded of an experience I had on Saturday setting up for field day. There was an ISS pass about 45 minutes before The start of the contest. I was still setting up and had no intent on working the ISS crossband repeater, but tuned in just to see you how much noise there was. I was not using Doppler correction just manual control of the FT 847. I had started my radio about 437.809 figuring that was the beginning of the pass with plus Doppler. I found that I had to tune up about three or 4 kHz to get the strongest signal on my receiver. I thought that was odd but had other things to do and so blew it off. I then saw this thread start about somebody commenting that they were about three or 4 kHz off and that got me following it a little closer.

Oh yes with the international space station, running reasonably current orbital elements is a very important thing to do for timing of the pass. In my case though since I wasn’t driving the radio with Software, it was just a surprise to me that they were that far off. 

So then has anybody experienced what I experienced? Maybe I have a radio issue I don’t know. But I just thought it was strange. 

73,  N5HYP Tom

Sent from my iPhone

On Jul 2, 2021, at 10:21, Paul Stoetzer <[email protected]> wrote:


Hmm...those keps are just a couple of hours newer than the ones in both nasa.all and nasabare.txt. I don't see any mention of an ISS manuever yesterday...

73,

Paul, N8HM

On Fri, Jul 2, 2021 at 10:59 AM jeff griffin <[email protected]> wrote:

Hi Ray, I'm now having the same problem. I found the keps for the ISS in amateur.txt to be what I think is right.  When I copied the keps for the ISS into my nasa.all file the ISS  AOS  was changed to 4 minutes later, so I think their correct. I don't have another pass to check this until 14 hours from now.  Plug these in and try....

ISS (ZARYA)            
1 25544U 98067A   21182.75718579  .00001475  00000-0  35189-4 0  9990
2 25544  51.6449 270.6712 0002215 128.1764  13.7831 15.48754489290857


73 Jeff kb2m

On 7/2/2021 10:39 AM, crohtun via AMSAT-BB wrote:
So… using nasabare for 7/2 didn’t help. The ISS was still about 10kHz above where SatPC32 was tuning the IC 9700. Had to enable the VFO and manually tune up to it and then follow it back down the band. Also still getting good signals after supposed LOS, down to -5 to -8 degrees. Had SatSat in front of me on the iPad watching the ISS az, el, range, altitude and Doppler at 100MHz, AOS/LOS times. It was all very close to what SatPC32 was displaying. Yet SatPC32 did not put the rig where the ISS links were. Only seems to affect ISS as far as I can tell. I really don’t get it. 


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