[ARC5] My ARC-5 40 meter station

[Robert Nickels]

When I wanted to put an ARC-5 transmitter on AM, I took the same 
approach Charles did, lazy man's style.

Clegg made the Thor 6, a 50 watt AM transceiver that was made small and 
compact by putting the power supply and modulator in a separate box.  It 
provides all the needed voltage including 600 volts B+ plate modulated 
by a pair of 6DQ6Bs, and interfacing to the ARC-5 or other transmitters 
is easily done by way of  a 12 pin Jones connector.   Since Clegg put a 
speech amp in the desktop unit and sent high-level audio down the cable, 
I included an LM-386 to provide sufficient audio with a hi-z mic input.

While it may not be easy to find a Thor lying around, I think there is 
merit in the notion of building a standalone power supply and 
modulator.   Since plate modulation transformers aren't easy to come by 
either, screen or controlled carrier modulation is an option if you 
can't find one.   With a bit of thought to AM/CW switching, T/R control, 
etc and you can come up with a nice solution that can be used with any 
number of different transmitters in the same power class.    I see 35-40 
watts output and 100% modulation with the minimally-modified command set 
transmitter.

73, Bob W9RAN

PS:  Here's what the Thor PS/Mod  looks like, if anyone wants to pursue 
this, email me for some easy and reversible modifications:
http://www.machine--tools.com/By-Location-/South-Dakota-/Clegg-thor-mod-ps-ham-radio-amplifier-power-supply-tube-img.jpg