[Lowfer] Fw: Xtal-Controlled Beacon Transmitter

[Zack Widup]

The famous Tri-Tet oscillator circuit should do nicely.  Uses a single 
tube, the ones I used in the circuit in the 60's were 6L6 or 6V6 tubes. 
I'll dig up a schematic shortly.

I was shown a neat trick for low-power applications when you need 120VAC 
at a remote point.  Get two transformers with 120 volt primaries and 6 or 
12 volt secondaries. Run the low voltage AC through the wires to the 
remote point and use the other transformer backwards to get 120 VAC 
remotely.

This doesn't work for a kW!  But it might for a simple small transmitter 
like the tri-tet.

73, Zack W9SZ


On Sat, 13 Sep 2008, John Andrews wrote:

> Ed,
>
>> As was previously stated re. my original message (below), I'm interested in
>> building something rock-bound & "vintage" for the 1750-meter band (160- to
>> 190-KHz)...NOT 1750-KHz! (apologies for my fat-fingering).
>
> Your message is getting through OK, but I'm afraid that most of us went 
> solid-state for this application a LONG time ago. The principal reason is 
> that the U.S. regulations count transmission line length against the antenna 
> length. This means that the transmitter has to be out at the antenna 
> feedpoint, lest you wind up with a very small antenna. For a tube rig, that 
> generally requires you to run 120 VAC to the transmitter, or possibly 
> separate filament and plate lines. It's much simpler to deal with 12-24 VDC.
>
> A quick web search turned up no real schematics for a tube rig. You might try 
> Googling "Dave Curry", and see if he can help you. There's a missing 
> schematic on his web site...
>
> John Andrews, W1TAG
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