[amsat-bb] PSK-31 Satellite Diplexer Help needed

[Bob Bruninga <bruninga@xxxxxxxx>]

Satellite 2m HYBRID Ring and 10m Diplexer help needed:

                           |
                           |19" whip vertical
+---------+                |
|2m VHF-A |-----+==========+
+---------+     "          "
                "  90 deg  "
                "  HYBRID  "
+---------+     "          "
|2m VHF-B |-----+==========+--||---+------- 19" horiz whip
+---------+                |       |
                           L       L  inductor
                           |       |
                          GND   +------+
                                |10m RX|
                                +------+
The 10m uplink RX of the PSK-31 transponder will need to tie into
one of the orthogonal 90 deg 2m whips (19") on our satellite.
Since we will have dual packet systems also using these 2m whips,
the 90 deg hybrid will give us the cross polarization we want, and
the dual   system inputs.  But we also need a lowpass receive
port for the 10m receiver.

If anyone with expert experience in these areas would like to help
us with our detail design, please let us know.  The above sketch
is what we are thinking.  (But we would actually hook the 10mRX to
the vertical whip, but for the drawing, it was easier to draw it
this way.

For the Hybrid design details sketch see

  http://www.ew.usna.edu/~bruninga/pec/psk31ant.jpg

And for the whole PSK-31 Transponder concept see:

  http://www.ew.usna.edu/~bruninga/psk31uplink.html

de WB4APR@amsat.org, Bob

PCsat WEB  page     http://www.ew.usna.edu/~bruninga/pcsat.html

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