Quote:
Originally Posted by turretslug
I'm sure I recall a three-hole coax fitting on some versions of the CR100, though I've no idea of its designation.
Did the receivers have provision for 240VAC operation as standard, or just US market mains- perhaps the mod was a UK-suited mains transformer. Or (clutching for those straws) a wider IF bandwidth for supersonic modulation, monitored by something wider-band than the human ear?
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Mine has a non-standard [rather larger] mains transformer fitted: it _looks_ to be rather old (cloth-covered leadout wires...) so I imagine it could have been fitted early in the radio's life. Equally, it could have been an 'old' surplus part that was fitted later to replace a burned-out original.
The 'wide' bandwidth positiongives 50KHz bandwidth, so there wouldn't have been much need to modify it to receive above-human-hearing modulation. I'd have expected this to be done though ny fitting a separate 'IF-out' socket so whatever Blumlein or Watson-Watt wanted could be coupled up as an external unit.
Interestingly, a few photos down here:
http://www.alternatewars.com/Bomb_Lo...Bomb_Guide.htm
shows what some claim is a S27 and others a S36 (at one time during WWII on the Hallicrafters production-line the front plates were seemingly interchanged depending on what they had and how urgent the order was...) Apparently it's being used to set up the radar-altimeter that triggered the bomb at the required height.