[amsat-bb] Re: RE: Geo Opportunity

[Keith N6ORS <k2@xxxxxx>]

ok, this is for a Mode K transponder.  21.4 mhz uplink /29.4 mhz dnlink.
Using 5w on the uplink (portable qrp type nuts) , and 10w (single
signal) on the downlink.

This would work nicely with a diplexer and a single tape whip with a 3/8
wave on 10m (1/4 on 15m).

Keith (N6ORS)



Uplink 15m
TX power          5W    37 dBm       
TX Antenna Gain          3 dBi
Polarization loss       -3 dB
Resulting EIRP          37 dBm
Path Loss at 10m      -150 dBm
Receiver Antenna Gain    0 dBi
Received signal       -113 dBm
Required for 10dB SNR
  in 3 KHz bandwidth  -119 dBm
------------------------------
Margin                 +6 dB

downlink 10m
TX power         10W    40 dBm
TX Antenna Gain          3 dBi
Polarization loss       -3 dB
Resulting EIRP          40 dBm
Path Loss at 10m      -153 dBm
Receiver Antenna Gain    0 dBi
Received signal       -113 dBm
Required for 10dB SNR
  in 3 KHz bandwidth  -119 dBm
------------------------------
Margin                  +6 dB
----
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