[Johnson] Ranger VFO Access Question

[Roy Morgan]

On Dec 18, 2012, at 10:10 PM, Roy Morgan wrote:

> ...  there has been identified a problem resulting in drift,  
> instability and warble in the VFO, especially on 40 meters ...

Johnson folks,

The web site where I Iearned about this is:

Johnson VFO chirp frequency jump
http://www.w8ji.com/johnson_vfo_chirp_jump.htm

Which explains:  " I finally figured out the problem was ground  
currents looping through the shafts and front panel, and getting into  
the VFO through the VFO shaft and other housing shield gaps."

The site is owned by Charles Rauch, W8JII. (I thought it was another  
person, but have gotten it straight now.)  His pages on Johnson  
equipment are:

[ Johnson TR Switch ]
[ EF Johnson Viking Ranger ]
[ Valiant ]
[ Audio Mod Ranger Valiant ]

My impression is that these pages should be required reading and study  
for Johnson equipment owners, especially anyone inclined to do the  
rather extensive mods found on the AM Window site and at other  
places.  The explanations and suggestions presented by W8JI impress me  
as being well founded in experience and measurements, reasonable, and  
easy to understand.

Thank you, Charles!

Roy

Roy Morgan
k1lky at earthlink.net
K1LKY Since 1958 - Keep 'em Glowing!