[Hallicrafters] SX-25 band 4 comment

[Rodney Bunt]

Tim,

In the good old days of octal tubes, you were really pushing it to receive much above 18MHz. The
15meter band was not even allocated in those days. Hallicrafters was one of the few manufacturers
to cover the VHF part of the airwaves. Technically VHF is from 30MHz to 300MHz.

They were well placed at the out break of WWII in Europe to provide radios that would receive up
to 42MHz. Hallicrafters sold a LOT of receivers to the UK and Russia.

The Sx-25 top band goes from 15MHz to 42MHz.

Only specialize Hammarlund SP-200 went to 40HMz.

Hallicrafters receivers were used in planes and on top of radio masts, to find the "Radio Beams"
used by the Germans to guide aircraft to bomb British Cities. The newer "Beams" went as high as
67MHz and 75MHz, the Hallicrafters SX-36 went up to 250 MHz using "acorn" tubes.

So when one says the rig is deaf on band 4 they mean the performance from 20MHz to 30MHz is not
what you would expect from a post WWII rig using Miniature tubes.

Rodney
VK2KTZ


--- tlogan7 at cox.net wrote:
> Hi folks - Below is a caption taken from a description of an SX-25 for sale
> on ebay. Could someone explain the comment made here about all SX-25's beng
> deaf on band 4 (and what does band 4 cover on the SX025)? I'm a newcomer to
> studying Hallicrafters - thanks for any input.
> Regards, Tim NZ7C
> 
> "Here is a Hallicrafters SX-25 Super Defiant receiver. The radio plays well
> on all bands but is a bit deaf on Band-4 (aren't all SX-25's?). The set has
> Push-Pull audio and sounds superb. It has had several cap's replaced
> including the electrolytic can. The set is clean except for scratches and
> blemishes on the top cover...an easy repaint job if you are so inclined. The
> bottom cover is missing. The line cord has been replaced by a modern 3-wire
> type. A fuse and fuse holder to protect the radio was added on the rear
> chassis"
> 
> _______________________________________________
> List Administrator: Duane Fischer, W8DBF **for assistance**
> dfischer at usol.com
> ----
> Hallicrafters Collectors International: http://www.w9wze.org
> ----
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