[BC] LPAM (was Smallest AM Radiator/TIS)

[R J Carpenter]

Uncle Willie,

WINX 1340 Washington ran a synchronous booster in the mid-1940s.  I 
understood that they sent the carrier frequency over the "microwave" 
link to the booster.

WWDC 1450 Washington also had a booster.  The story was that they sent 
100 kHz on an open-wire transmission line along the B&O Railroad 
right-of-way from central Washington to the booster between Silver 
Spring and Chevy Chase.  More likely they sent 1450/16= 90.625 kHz to 
the booster.  The 1450 main transmitter was near Union [railway] 
Station in DC and is still there.

Niether booster was a success. They never found a good phase 
adjustment the would place the destructive interference in a location 
were it didn't matter.   Among other problems.....   I imagine that 
equipment reliability was also a problem way_back_then.

bob c.



From: WFIFeng at aol.com
> Well, when you figure that you can pass a couple of Mhz in a video 
> channel,
> it's not too hard to pass an AM carrier frequency there. Even if you 
> have to
> skip pulses during the H and V blanking intervals, any decent x-tal 
> osc at the
> other end (Rangemaster unit) is not going to drift by much during 
> those tiny
> gaps. Sounds like a pretty decent and workable way to sync a bunch 
> of
> Rangemasters. Kudos to some creative thinking/engineering. :)