[hpsdr] preselectors on a bigger scale

[Henry Vredegoor]

Hi Frank,
 
I would be interested in a copy of the diagrams!
Would pictures of the hardware also be possible? [ They say more than a
thousand words..... ;-)  ]
 
Thanks,
 
Henry.

-----Original Message-----
From: hpsdr-bounces at hpsdr.org [mailto:hpsdr-bounces at hpsdr.org] On Behalf Of
FRANCIS CARCIA
Sent: vrijdag 16 maart 2007 13:29
To: hpsdr at hpsdr.org
Subject: [hpsdr] preselectors on a bigger scale


All,
The cubic preselector module is pretty nice and it is small. I have 2
R3030s.
The next size up would be the Racal DF preselector in a 3 inch rack. 13
filters (1/3 oct) to cover .5 to 30 MHz. 4 bit control again with three bits
to select one of 3 20 dB pads. all the inductors are larger and it has a
bipolar amplifier. They come in two models single board or dual board
(channels) The TCI DF system used used 5 channels and 5 receivers. I can
scan it and mail it to anyone interested.  These show up on ebay once in a
while and make a good front end. This one uses relays to switch all
channels.  fc
 

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