[Premium-Rx] Preselector for HF Receiver

[Gary Geissinger]

Enrique,

The RF-551A is an amazing preselector; however, its strengths probably don't matter to most HF listeners.

It is designed for installations where full duplex HF radiotelephone operation occurs.  We use these for ARRL Field Day.  It is possible to listen on 7 MHz while 1500 Watt transmissions are taking place on an adjacent antenna.  It will operate nominally with high amplitude RF coming in the receive antenna input.

The downside is that it has a relatively high noise figure.

I suspect there are good passive preselectors out there that don't impact the noise figure as severely.  I use an F-1238/URR-62 passive preselector with my WJ-8712.

Gary WA0SPM

-----------------------------------
Sent from my BlackBerry Wireless Handheld

----- Original Message -----
From: premium-rx-bounces at mailman.qth.net <premium-rx-bounces at mailman.qth.net>
To: Premium-Rx at mailman.qth.net <Premium-Rx at mailman.qth.net>
Sent: Sat May 26 13:32:03 2012
Subject: [Premium-Rx] Preselector for HF Receiver






 
 Hello all,
 
    I am quite confused about what preselector to choose for my Racal 1772 receiver.   Single pole or four pole?
 
   Recently, I have read an article about preselectors and says that one pole provides outstanding protection against out of band interferences.
 
   Harris RF 551 A could be a good election but it start to work from 2 Mhz and I am interested in a full coverage of HF spectrum.
 
  Any recommendation or advice would be greatly appreciate.
 
  Thank you very much.
 
  Regards
______________________________________________________________
Premium-Rx mailing list
Home: http://mailman.qth.net/mailman/listinfo/premium-rx
Help Page: http://mailman.qth.net/mmfaq.htm
Post: mailto:Premium-Rx at mailman.qth.net
Help Contact eMail:  paul at 8zo.com
Home Page:  http://www.premium-rx.org/

This electronic communication and any attachments may contain confidential and proprietary 
information of DigitalGlobe, Inc. If you are not the intended recipient, or an agent or employee 
responsible for delivering this communication to the intended recipient, or if you have received 
this communication in error, please do not print, copy, retransmit, disseminate or 
otherwise use the information. Please indicate to the sender that you have received this 
communication in error, and delete the copy you received. DigitalGlobe reserves the 
right to monitor any electronic communication sent or received by its employees, agents 
or representatives.