[Boatanchors] Fwd: radio

Glen Zook gzook at yahoo.com
Mon Aug 13 11:33:56 EDT 2012

In the case of Hallicrafters, the "X" could have just indicated that there was some sort of crystal in the radio.  Both the SX-140 and the SX-101 series did have a crystal calibrator!

The HQ series was made by Hammarlund.  Most, but not all, of the Hammarlund receivers with a crystal filter had an "X" at the end of the model number.  A notable exception is the SP-600 series.  Those with an "X" in the model number such as the SP-600-JX-17, had the ability to have the frequency crystal controlled.
Glen, K9STH

Website:  http://k9sth.com

 From: Bill Fuqua <wlfuqu00 at uky.edu>
To: Brian Carling AF4K <bcarling at cfl.rr.com>; BoatAnchors <boatanchors at puck.nether.net> 
Sent: Monday, August 13, 2012 9:59 AM
Subject: Re: [Boatanchors] Fwd: radio
   Wow, it just occurred to me. There were other models that used the X and 
did not have a "crystal filter".
Models with low frequency last IF like the SX101 had LC filters but not 
crystal. So in that case
I assume the X means a very good filter. One as good or better than a 
crystal filter.
But still not a good explanation for the SX140.
    Now, keeping that in mind the HQ129X and similar ones had crystal 
filters but
the HQ170 did not nor did they use the X designation.

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