Rubbish I run all my transverters and power amps right through 3456Mhz in
the shack with great results , On 3456 a single loop yagi has 112 elements
is 12 feet long and has about 23dbm gain with mast mount preampsresults are
excellent. More important is the correct installation of connectors to keep
loss to a minimum. Try putting a 200 watt 2304 amp on the tower,ain't going
to happen.
73 kf4yox
----- Original Message -----
From: "Lyle Johnson" <[EMAIL PROTECTED]>
To: "michael taylor" <[EMAIL PROTECTED]>
Cc: "Elecraft" <[email protected]>
Sent: Monday, October 29, 2007 4:14 PM
Subject: Re: [Elecraft] [K3] K3, P3E, Transverters (Satellites)
Maybe wait for future K3 VHF/UHF modules?
Perhaps a KM1 weak signals oriented (CW, SSB) DSP based VHF to
microwave transceiver? Maybe vaguely similar to Bob W7PUA's DSP-10 2m
SDR/DSP transceiver. :-)
One of the problems with gear for 900 MHz and higher is that you really
want the RF deck mounted at the antenna, if possible. A weatherproof
transverter, if you will. Feedlines affordable to most of us have too
much loss. AN alternative is to remote a preamp and power amp, and let
the feedline loss attenuate the Tx output of the shack-based exciter to
the drive level needed by the power amp at the antenna.
With satellites, you often have a situation where you only want/need a Tx
or an Rx converter. L band for satellites in the Amateur Service are
restricted to 1268-1270 MHz, uplink (transmit) only. Until now, S-band
(2.4 GHz) has been downlink (receive) only. So traditional transverters
may not be the most cost effective solution. For VHF/UHF this is not the
case, where 2m and 70cm are used for both up- and downlink and feedline
losses are manageable (even if the antennas aren't!).
Another consideration is full duplex operation for satellites, which
suggests you want different IFs for Tx and Rx. Finally, you probably want
VHF IFs for microwave operation for image rejection if nothing else.
73,
Lyle KK7P
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