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

[J Forster]

Possible, but it could also have been done with a simple configuration of
relays w/o any analog "voting". Each of the four APS-13's would simply have to
have 4 independent NO contacts and the contacts wired as follows:

Connected as follows: (A.B.C)+(A.B.D)+(A.C.D)+(B.C.D)= Poof !

Much easier, IMO.

Best,
-John

=============

Marty Reynolds wrote:

> >
> > 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
>
> I have pictures
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