[ARC5] Re: [Milsurplus] History of Ham Mods: Opinions?

[Marty Reynolds]

>
> To elaborate, there were four of the APS-13s in each weapon, in both
> Little Boy and Fat Man - all having a different set of frequencies to
> avoid interference.. There was an averaging system to account for spin
> of the bomb casing in flight. The weaponeer could have switch selected
> an alternate set of frequencies if Jacob Beser (the RCM officer) had
> identified potential interference.
>

Mike I've read the 'averaging' was that 3 of four sets had to agree on
altitude.  Provoking.  I've wondered just how with VT electronics.  Then
comes an epiphany.  Bet each APS-13 pulled in a relay with contact sourced
by a resistor-seriesed reference voltage.  That grounded it's own resistor
back to same resistor-seriesed reference voltage

When three such resistors parallelled, a plate-sensitive relay engaged
who's coil across same resistor-series reference voltage. In came it's
contact & BLOOOIE

Crude, simple, but effective

Next note the APS-13 antennas were half-folded dipoles with a half
reflector.  Someone a long time back wondered why USA avoided yagis
in ww2.  Know of another use & that was TRC-1.  Employed on D-day across
channel on 80 mhz +/-.  Then there was an Aussie B24 DF with the half-yagi
set-up.

Immitation is the sincerest form of appreciation, collector san

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