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U/S2 transponder frequency



Don Agro wrote:

The AMSAT-DL page shows the passband limits (without doppler) as:
<http://www.amsat-dl.org/journal/adljxpnd.htm
<http://www.amsat-dl.org/journal/adljxpnd.htm> >
  2,401.210                   435.780    S2 passband lower limit
  2,401.495                   435.495    S2 passband upper limit

This is:         Uplink = 2836.990 - Downlink


Wayne replies:

Unfortunately, the "old" AO40 frequency plan (showing a U/S2 transponder
frequency of 2837.025 MHz) is still prominently linked from the AMSAT-DL
English "home" page and "AO-40 links" section.  The URL with the updated
information is seemingly impossible to find if you don't have a direct
hyperlink.

I was very surprised to find such a large transponder frequency error when I
first got on the air during the test period.  A lot of needless QRM at the
start of the "test" period could have been avoided if the controllers
announced that the actual U/S2 transponder frequency is 35 kHz lower than
what was published at the time.

Wayne Estes W9AE
Mundelein, IL, USA

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