[Hallicrafters] RE: SX-24 Receiver Super Det

[Mike Everette]

A correction to the information below:

--- Bill Gerhold <k2wh at optonline.net> wrote:

> The SX-24, the Skyrider Defiant" as it was called,
> was manufactured only in
> the year 1939.  

The SX-24 was produced from 1939 till 1943.  It even
carried a JAN nomenclature in military service.  I
think that was R-203/U or maybe R-208/U.  Check the
online Military Commo Equipment List.

if you have what you call a "Power
> pack", that was probably the
> optional 12 volt DC pack for operating the radio in
> the car.

Cars in the 1940s (and continuing through some time in
the mid 50s) used SIX volt electrical systems, not 12.

Yes, it is a general coverage receiver, 540 KHz
through 43 MHz in four bands.  The bandspread is
calibrated for 80-40-20-10 meter ham bands (no 15
meters till well after WW2).  

The SX-24 is probably the design-antecedent of the
SX-99 and SX-110, as the circuitry is very similar
except for the use of more modern tubes in the later
receivers.  All three have one RF stage, 2 IF stages
at 455 KHz, crystal filter and single ended audio. 
Halli was good at taking a basically sound design and
"stretching" it, in some cases merely by reboxing the
radio (SX-99 and 110 are a  standout example; they are
identical circuitwise).

73

Mike
WA4DLF




		
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