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- Subject: [linrad] Daydreaming
- From: Stan <stan@xxxxxxxxxxxxxxx
- Date: Tue, 21 Oct 2003 14:19:13 +0000
Hello the Net:
We have come a long way with DSP on a PC.
Progress on RX is significant with Leif's hardware offerings. After we
get to a 2M IF, many other bands can be used
with other dual channel down converters with a common LO.
But, what direction are we going in, with the TX side ?
If the TX DSP signal is to be generated from a PC/Soundcard, we will
have to up convert to the operating freq
and separately feed the linearly polarized V and H antennas.
With 2 separate TX channels, components will be 2 X as expensive as they
I am trying to think of alternate approaches to get a polarization
variable signal more suitable for EME or terrestrial comms,
without the expense of 2 separate TX systems, 1 for V and 1 for H.
Possibly if I could power divide the TX output into 2, one going
directly to one antenna polarization and the
other split going to a electrically tuned phase shifter. The phase
shifter being controlled by a PC/Soundcard.
What are others proposing to do for the most improved TX side ??
What would be the result of feeding a RHCP and a LHCP signal from a
septum feed to the 2 RX channels
and down converters for use with LINRAD ??