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The frequencies are no big secret.....there have been multiple posts here 
about how to set up your radio to correct for the doppler. I pasted the 
method at the end of this post.

As far as joining the club....you have a ham license ...then you're already 
in it.

We all help each other out here. This morning I made my UHF contact with 
ISS ...I asked Bill if he would try and contact a handicapped student who 
couldn't get to my station because of snow here in NJ. He was trying using 
his kenwood 2000 with 20 watts to a verticle. Bill asked everyone to hold 
off calling while he called this kids call sign (KC2FDQ) 3 times. We 
weren't successful but, hey, that's part of the game too.

I run a big  gun station and can get in on any pass, but I've only made two 
contacts. One on VHF passing Ed Coles call sign and schedule in Alaska up 
to ISS to help Bill get his WAS and one this morning on UHF trying to help 
KC2FDQ. My Son Sean KC2DIJ made one on UHF the day before.

Don't get frustrated by lack of success, sooner or later you'll nail it. 
Talking to an astronaut is not so much a contact but an accomplishment.

Keep learning and keep trying.... we love it when some one posts their 
first contact here on the board.  !!!

Al Emer, N2YAC
Amsat 30942

Ken Ransom sent this to the club:

This weekend (Jan 14-15 UTC) Bill McArthur plans to operate on the UHF band
exclusively. It is his desire to work all continents on the UHF band from
the International Space Station.

The frequency he will be using will be 437.55 simplex. Due to the high
Doppler effect on this band, one will need to operate split frequencies for
most of the pass. A very simplified chart showing memory assignment for
transmit and receive with 5 KHz spacing is below as an example .

Mem.     TX     -    RX
Ch A - 437.540 - 437.560  Acquisition of signal (AOS)
Ch B - 437.545 - 437.555
Ch C - 437.550 - 437.550  Time of closest approach (TCA)
Ch D - 437.555 - 437.545
Ch E  -437.560 - 437.540  Loss of signal (LOS)

Good Luck and 73,

Kenneth G. Ransom - N5VHO
ISS Ham Radio Project Engineer
Johnson Space Center
Houston, TX


At 01:27 PM 1/15/2006, you wrote:
>I guess this is some kind of big "secret" about what uplink and downlink 
>frequencies you are supposed to use to communicate with the ISS 
>austronauts when they are active. I just saw someone post that they talked 
>with ISS via 437.55 (uplink or downlink??) and have also tried 145.2 and 
>144.49 U/L always using 145.80 for D/L. I do not see 437.55 even listed on 
>the AMSAT sat info site. Nothing so far, and perhaps I am not even using 
>the right freqs?? How do I join this club??
>John Owens - N7SEJ
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