[Lowfer] Fw: Xtal-Controlled Beacon Transmitter

John Andrews w1tag at w1tag.com
Sat Sep 13 06:59:23 EDT 2008


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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