[Johnson] Ranger died - reviving

[Bill Cromwell]

On Sun, 2012-12-30 at 12:00 -0500, Pat Thompson wrote:
> Bill:
> 
> Sorry to hear your bad luck.  There's still straight key night ;-).
> 
> I'm interested in your replacement for the drive pot.  I'm assuming 
> you're going to use a small wattage pot to control what amounts to 
> variable DC power supply for the drive control.
> 
> Have you or someone else written this up where I can see the circuit?  
> My drive control for the Ranger still works but it's otherwise ubobtanium.
> 
> Pat
> wa4tuk

Hi Pat,

I have a file for a project involving the DX-100. It uses the same 4
watt, 25k pot in a very slightly different circuit. I intend to adapt
that into my Ranger and install it in the DX-100 as well. I would have
thought a 4 watt pot would be pretty much sufficient in that role. But..
it IS wirewound and has been exercised a lot in the past 50 plus years.
If a spot got worn thin it might succumb to the current it could handle
when it "young". I don't know where I downloaded the file but I have a
small web page saved (complete) in a small MHT file. I'll send you a
copy in a private message. Yes..it uses a high voltage NPN transistor as
the regulator a and puny little pot to control it.

I don't have another transmitter working that will do 160 meters. I have
a couple of them that get me on the other bands. Antique Kenwood and and
even more antique Apache. Probably the drive pot in the Apache would
interchange nicely but the Apache works. I don't wanna change that.

73,

Bill  KU8H