[MAMS] 5.7 GHz rainscatter question

[Dr. Gerald N. Johnson]

That's about what I thought. I have most all QSTs on CD or paper or 
both. Not all organized on paper but nearly continuous since 1955 when I 
was a novice. Have CD back to the first one but not the most recent 
decade or so.

Need a relay for the antenna end, but not really the mixer end. As Paul 
Wade likes to say, GAIN is CHEAP. His designs sometimes use a common 
mixer then a 3 dB splitter/combiner to connect RX and TX gain to the 
mixer. A circulator would work super in that position also. PIN diodes 
OK, maybe even plain diodes as RF switches since its easy to make up 
gain with any number of inexpensive MMIC. And with a bit more gain even 
a star connected set of three 16 ohm resistors would work. Probably 
actually needs a bit more filtering so copying a W1GHZ version with pipe 
cap filters would be a benefit.

Trying to fit in a relay and PA on my 10G portable I just stripped out 
one of the screws holding the SMA connector to the feed horn waveguide. 
And before that found the preamp I though about using has lost a bunch 
of gain, while it draws enough current to run hot and the HF is now 
poorer than the transverter alone, so I have work to do. The transverter 
alone received decently last fall, adding power to the transmit will 
help a lot.

73, Jerry, K0CQ

On 8/8/2012 1:25 PM, Zack Widup wrote:
> Danny has the 5760 MHz bilateral transverter designed by KK7B. There is
> only one mixer, used both on transmit and receive. It has one input and one
> output. If you're an ARRL member and signed in at the ARRL website, you can
> see the article here:
>
> http://p1k.arrl.org/pubs_archive/86168
>
> The only way to make this work with an external LNA on receive and power
> amp on transmit is to use some sort of relays to separate the signals.
>
> I built this one:
>
> http://www.w1ghz.org/QEX/A_Single-board_Transverter_for_5760_MHz.pdf
>
> This uses two mixers and separate transmit and receive lines. It's easier
> to work with.
>
> 73, Zack W9SZ
>
>
>