[Milsurplus] Ray's mystery box

[ed sharpe]

APT 5....  isn't that  a countermeasures transmitter?   I seem to remember
it as such...

ed sharpe
----- Original Message ----- 
From: "Eric Jones" <ejones at hiwaay.net>
To: <milsurplus at mailman.qth.net>
Sent: Friday, August 27, 2004 5:15 PM
Subject: [Milsurplus] Ray's mystery box


> de N4TGC Eric
>
> Ray's mystery box does sound like an early v. of the ASB (Aircraft,
Special,
> Bombing) gear.  I have schematics for the ASB-5 and -7, which describe
much like
> his, except the front end is composed of three 446A 'lighthouse' tubes for
RF
> amp, 55mc converter, and HF osc., followed by a string of six 6AC7's, the
third
> of which is a second converter on 16mc (fed by a 6AC7 as 71mc osc); then a
6H6
> detector, 6AC7 video amp., and 6AG7 video PA.  The unit was the receiver
for a
> ~400mc radar ranging pair, of which the tx would be an APT-5 or such,
using
> 3C22, more 6AC7's, 829B, 6AG7, and 6LG7 (huh?! - have to look that one
up!)
>
> The front might have a power jack in the lower right, tuning gearbox above
that;
> a couple of spring-loaded covers over other tuning adjustments; a quad of
jacks
> for sensitivity switch, video in, rcvr out, and rcvr input.  Can't really
tell
> the size from the illustration in Caringella and Clark's book.
>
> Probably a pretty useless piece of 'looky-here', but probably rare, too!
e
>
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