[MRCA] Bruce Kelly 1929 Event - - - Transmitter Buzz and Chirp

[Robert W Boyd]

Breck, it's a great job!

73, Robert, VE3BE

On 18/11/2019 7:10 p.m., B. Smith wrote:
> Spent a pleasant Sat evening and Sunday afternoon working the Antique 
> Wireless Association  Bruce Kelly 1929 QSO party. Several hours of 
> attempting to copy various stations with  some of the transmitters 
> drifting in frequency and producing various chirps, buzzes, klicks, 
> and whoops. So the technique was  to keep one hand on the receiver 
> tuning dial while I wrote down the contest exchange information with 
> the other hand. The rules required that you  exchange QTH, Op info and 
> type of transmitter with each participant using a circuit and tube 
> used in 1929 or earlier and I used a type 10 tube in a  simple Harley 
> Oscillator circuit mounted on a piece of plywood -  Not difficult to 
> construct and a nice weekend project, I know its ugly but it 
> functioned, I might varnish a board and clean up the circuit but that 
> is not my style. Improvise-Adapt- Overcome.  Biggest problem during 
> construction was finding a tube socket or you had to utilize brass 
> tubing for a crude tube pin connections.   During the contest I had 
> noticed that my transmitter had a annoying problem with a  occasional 
> varying in frequency by several hundred cycles and was intermittent. 
> The mystery drift would last for several seconds. Finally I realized 
> that the local winds were gusting up to 15 knots and my tree supported 
> loop antenna and open wire line were being blown back and forth by the 
> wind and effected the load on the transmitter. Anyway a operating even 
> that is  different and you have to actually build something.  The 
> wooden dowels help with keeping the circuits isolated while you tune. 
> Small dial lamps were used for the filament center tap. The TR switch 
> was fabricated out of copper tubing that was squeezed flat in a vice. 
> One special highlight  was working Vermont and  and MRCA member KK1K.
> Z
>
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