[Johnson] Ranger 1 Question/Problem

[peter markavage]

If you haven't done so, why not check the Johnson and boatanchors for
past discussions on the Ranger.

Go to http://www.w9wze.org/  Go to left side of screen down to E-Mail
Reflectors; Click on "Search All Archives"; Select Johnson and/or
Boatanchors from the drop down list; Put in "key word or words" ; Get
discussion info all the way back to the 90's. This is easy and provides a
lot of useful input.

Pete, wa2cwa


On Thu, 07 Apr 2005 17:54:45 -0400 Jim Brannigan <jbrannig at optonline.net>
writes:
> The conventional wisdom ( in all the on line literature) is to move 
> the
> Ranger VFO VR dropping resistor to the OUTSIDE of the VFO box.
> I have done so, but the Ranger is still on the bench so a change is 
> not a
> big deal...
> 
> What is the new "conventional wisdom"?
> 
> Jim
> 
> 
> > Makes sense to me, Glen. I don't relocate them anyway, I just 
> change out
> the
> > original carbon unit with a 7.5 watt 18K Dale wirewound, and that 
> seems to
> > work just fine. Doesn't change the wattage inside the VFO cage, 
> just
> spreads
> > it out a little. Ha. Hope folks don't get the idea they don't have 
> to do
> > anything about R3, though. It will fail for certain someday, and 
> it's
> > failure mode will invariably be decreasing R, with a resultant 
> increase in
> > load on VR tube, and concurrent increase in I as the poor 
> overworked VR
> tube
> > works it's little guts out trying to keep up, which of course 
> increases
> the
> > current through R3 again, which increases the heat, which 
> increases rate
> of
> > R decrease, ad infinitum. A classic vicious circle, and the 
> eventual
> result
> > is not pretty, as documented by some photos floating around the 
> web.