The other day I started to use the UPDOWN program (version 1.E) and noticed that the
program may not be calculating the transmit frequency correctly when a Doppler shift
is used. Can someone confirm if there is a problem or not?
Here is what the program produced when I entered the receive frequency and doppler
shift frequency:
For RS-10 Mode A
Down Freq MHZ Up Freq MHZ Doppler KHZ
29.380 145.880 0
29.381 144.881 +1
29.379 146.879 -1
It is possible that I don't understand how to correctly take into account the doppler
shift, but this looked real strange to me. I tried some other frequencies also and
it seemed to put the transmit frequency out of band.
By way of test to see if I knew how to figure in doppler shift, I was on RS-15 the other day (close enough to RS-10 in frequency conversion) and made cont
29.38048 + 116.504 - .202 = 145.884278. UPDOWN would have put me who knows where.
Thanks for any assistance.
73s,
Charlie Sufana AJ9N Internet sufana@ceco.ceco.com
ComEd - A Div. of Unicom (formerly Commonwealth Edison Co.)
Work address: ComEd, System Protection Dept. 1039E, 125 S. Clark St.,
P.O. Box 767, Chicago, Il. 60690
Work phone: (312) 394-2815, work fax: (312) 394-4583