[Boatanchors] 20s or 30s type transmitter

[howard holden]

Hello Bill, sounds like you're thinking of the Antique Wireless Assn 
Bruce Kelley 1929 transmitter party in December. You can visit the AWA 
website antiquewireless.org for details on it.

There are lots of circuits around for suitable transmitters for the 1929 
party. I'd start by taking a look at Steve VE7SL's website, 
http://members.shaw.ca/ve7sl/. Lots of good info, some schematics too. 
If you are an ARRL member, you can also use the ARRL's QST archives and 
wander around the 1920's. Many circuits there. Simplest, and easiest to 
get going is the Hartley oscillator. Most hamfests will provide suitable 
tubes for this (think 210, 245, etc.)

They're simple to build, easy to get going.

On the 1/4" copper, that's pretty much the "standard" for most people 
building these. The sand idea that Howie WA3MCK suggests will work well, 
although typically 1/4" copper doesn't collapse significantly unless you 
try to wind it too small in diameter. You want to use 2.5" or better 
diameter. PVC pipe from the local big box store makes an excellent form 
on which to wind. You wind it close under fair tension, allow it to 
spring away from the pipe, then space the coil by threading different 
size screwdriver shanks or similar in between the turns. Spaces them out 
very evenly. I've built a number of different types of self excited 
oscillators, with very good results.

Good luck, hope to work you in the AWA party.

73, Howie WB2AWQ/7 Reno NV




On 10/19/2016 9:54 PM, Howie WA3MCK wrote:
> Hi Bill,
>
> What method will you use for winding,  bending, or rolling a tank coil
> utilizing 1/4" copper tubing?
>
> My Elmer, Jerry W3YVZ (SK) described a method where he filled the section
> of tubing he was bending with sand. I forget the specific details.
>
> Looking forward to hearing about your 20's / 30's transmitter project.
>
> Tnx de Howie WA3MCK
>
>
> On Wednesday, October 19, 2016, William Wood <ke9xq at charter.net> wrote:
>
>> OK guys
>>     I just picked up a very nice dark maple
>> breadboard earmarked for an early type
>> transmitter.  Would like to see a half a dozen
>> schematics and study this for a while before
>> making up my mind which way to go…
>>     Bought some nice 1/4 inch copper tubing for
>> the coil and think I have a meter or two to help
>> in the collecting of parts.  Anyone want to give
>> me a hint or two on which rig you would build if
>> you were going to?
>>     And, I should ask for info on making sure it is
>> type excepted for the QSO contest…   (Can’t
>> remember what the name of it was, but basically
>> it is 20’s or early 30s type of transmitter…   Please
>> set me straight on that and the rest of the questions
>> I should have been asking.
>>     Tomorrow night I plan on doing some web browsing
>> and then should find some of those answers and maybe
>> learn to ask some more questions…  : )
>>     No hurry on my part, just thought this might be a
>> nice winter project.  Thought of this for years, but never
>> started the project.
>> 73 fer now
>> Bill  KE9XQ
>>
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