[amsat-bb] Re: ISS Repeater

David Barber david.barber at dbelectronics.co.uk
Mon Dec 29 05:56:52 PST 2008

So guy's correct me if I'm wrong but from a rough calculation that puts
Mike's ERP at 4.7Kw.

Leaving my 170w ERP looking rather meagre by comparison! :-)

Congrats to Mike and Clare on their contact.



-----Original Message-----
From: amsat-bb-bounces at amsat.org [mailto:amsat-bb-bounces at amsat.org] On
Behalf Of n1jez at burlingtontelecom.net
Sent: 29 December 2008 12:36
Subject: [amsat-bb] ISS Repeater

Just got on the ISS repeater - L band up and V band down from FN34 here in 
Vermont.  I used full power here. 80 watts in the shack to a 55 el 1269 
Directive Systems loop yagi. Transmission line is 75' of 7/8" hardline.

Results were mixed. The pass was 25 degrees max here. I had little to no 
success as the ISS was ascending. I opened the repeater a couple of times. 
I'm not sure if this was because other stations were trying and we were 
clobbering each other or not. As the ISS was going overhead, it appeared 
that the polarity was shifting rapidly as I would open the repeater for just

a word or two. I did hear Clare, VE3NPC briefly. As the ISS was descending, 
things got better and I was able to consistently open the repeater, but 
nobody came back.... I could not access the repeater below 10 degrees....

If anyone else was on and trying, can you let me know? I'd like to see if 
that was the reason I couldn't access the repeater as it was ascending. One 
other observation, I found the doppler correction to be pretty critical. 
I've seen this when running low power into AO-51 for tests.

I hope to try a few  more passes this week.

Mike, N1JEZ
AMSAT 29649
"A closed mouth gathers no feet" 

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