| |
VK6BE > CW 24.07.05 04:45l 27 Lines 1081 Bytes #999 (0) @ WW
BID : C00256VK6BE
Read: GUEST
Subj: RE: VK6BE & Fullerphone..
Path: DB0FHN<DB0MRW<DB0WUE<DK0WUE<SP7MGD<RZ6HXA<OK0PPL<DB0RES<ON0AR<ZL2BAU<
VK6HGR<VK6BBR<VK6ZRT<VK6JY
Sent: 050723/1356Z @:VK6JY.#ALY.#WA.AUS.OC #:64272 [Albany] wFBB7 $:C00256VK6B
From: VK6BE@VK6JY.#ALY.#WA.AUS.OC
To : CW@WW
I think Fuller was the name of the inventor. I also received a bulletin
(PN) asking why they didn't just use a DC telegraph line in the Army
instead of a DC buzzer type of signalling device.
A DC device would have been a sounder which could be heard at some
distance (and read) by the enemy. The Fullerphone had built in secrecy in
that you couldn't detect it unless you were connected into the same line
with another Fullerphone.
The field telephones (Don 5s) used by the Aust. Army in WW2 had a buzzer
calling device and a morse key built in, no bells. However to send morse
code using the buzzer breached secrecy since the buzzing noise was
broadband and could be picked up quite easily with a simple crystal set.A
more sophisticated field telephone was the Freddy Phone which had calling
bells.
Bob VK6BE.
>
> Thankyou to Bob for his information about the fullerphone, all very
> interesting, had asked a couple of local hams who had worked with CW
> for many years, they had never heard of one.
> (&) Andrew J. Bowlby
>
>
Read previous mail | Read next mail
| |
