[Johnson] Ranger VFO Access Question

[Patrick Thrush]

" The site is owned by Charles Rauch, W8JII.."

Or better known to many of us, Tom Rauch of Ameritron design fame (or
infamy, if you happen to be talking to Rich Measures, AG6K...)

Tom backs up his writing with demonstration on lab grade equipment.  I
second the observation to check out his Johnson info before going all
Timtron on your rig...

73,
 
Patrick Thrush, AE1PT
Bath, NY  14810
42.333  -77.309   CQZ 5  FN12ih
SKCC #4473

-----Original Message-----
From: johnson-bounces at mailman.qth.net
[mailto:johnson-bounces at mailman.qth.net] On Behalf Of Roy Morgan
Sent: Wednesday, December 19, 2012 8:47 PM
To: Johnson at mailman.qth.net
Subject: Re: [Johnson] Ranger VFO Access Question


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!



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