January 10, 2006


Bill McArthur on UHF band next weekend.


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