[Hallicrafters] SX-100 and the SX-101CMKIIIA

[wb8jkr at juno.com]

  Let me correct myself, the SX-110 did indeed
have  "Sharp" and "Broad" selectivity settings 
so you very well may be right.

Mark  WB8JKR


On Sun, 21 Nov 2004 07:42:14 -0500 wb8jkr at juno.com writes:
>  Well again, the SX-110 general coverage receiver
> didn't have variable selectivity capability. It looks
> to me that it wound up being if the RX had a crystal
> anywhere in it, it was an "SX" be it in the I.F. as a filter,
> or as a crystal in a calibrator, or if the BFO was crystal
> controlled.
> 
> Mark  WB8JKR
> 
> 
> On Sun, 21 Nov 2004 07:23:56 -0500 George KB2Z
> <Thermionic_Emission at earthlink.net> writes:
> > It began as a designator for the xtal filter. I would venture to 
> say 
> > it 
> > became a marketing scheme to represent higher quality, our best, 
> > expect to 
> > pay more, etc. Name and series recognition. All manufacturers do 
> it. 
> > Cars, 
> > boats, appliances. and electronics.
> > 
> > The following was lifted from LA5KI
> > "The first "SX" series radio, the SX-4, was built in 1934 as an 
> > option to 
> > the S-4 "Super Skyrider" . The difference between the two was the 
> > addition 
> > of the crystal filter in the "SX" prefix. The "SX" prefix from 
> that 
> > point 
> > on meant that the radio had switchable selectivity position(s)."
> > 
> > It looks like in later years it was  switchable selectivity 
> > position(s) 
> > that made it an SX.
> > 
> > Happy Hammin, George KB2Z
>  
> > 
> > At 06:59 AM 11/21/04 -0500, you wrote:
> > 
> > >The "X" designation in all early Hallicrafters receivers always 
> > denoted a
> > >model with a crystal filter to differentiate it from that same 
> > model 
> > >without the
> > >crystal filter. Later Hallicrafters receivers featured dual 
> > conversion,
> > >passband narrowing and or filters that did not have a crystal as 
> > engineering
> > >refinements were adopted and circuits were better designed. Is it 
> 
> > possible
> > >Hallicrafters included the "X" in the model prefix of later 
> models 
> > without 
> > >a crystal
> > >filter to denote receivers having crystal controlled 2nd 
> conversion 
> > >oscillators?
> > >
> > >Regards,
> > >Greg Gore; WA1KBQ
> > >Charlotte, NC
> >
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