[Johnson] Ranger I problem

[Gary Schafer]

The resistance on each side of center on the primary won't necessarily be
the same. Its been awhile since I checked a good transformer so I can't
remember the difference but it can be in the order of 10% or so difference
from one side to the other. This is due to the different lengths of wire on
each side of the primary. It takes more wire as the core gets bigger.

Maybe they will tell you in the manual what the difference should be.

73
Gary  K4FMX

> -----Original Message-----
> From: johnson-bounces at mailman.qth.net [mailto:johnson-
> bounces at mailman.qth.net] On Behalf Of Craig C. Heaton
> Sent: Monday, August 21, 2006 6:30 PM
> To: Jim Brannigan; johnson at mailman.qth.net
> Subject: RE: [Johnson] Ranger I problem
> 
> Jim,
> 
> Take a look in the manual and see if the dc resistance is listed for the
> modulation transformer. On the primary side each side to center should be
> the same, hope the manual gives values for both primary and secondary.
> 
> I had talkback problems in a Johnson "500", Peter Dahl to the rescue. Had
> to
> buy a new mod tranny, the old one didn't have the same resistance on the
> primary (each side to center) and the secondary was out of spec (internal
> short).
> 
> 73's
> wd8kdg
> Craig
> 
> -----Original Message-----
> From: johnson-bounces at mailman.qth.net
> [mailto:johnson-bounces at mailman.qth.net]On Behalf Of Jim Brannigan
> Sent: Monday, August 21, 2006 3:00 PM
> To: johnson at mailman.qth.net
> Subject: [Johnson] Ranger I problem
> 
> 
> My Ranger was completely refurbed and has been working properly.
> 
> I put it on the bench to reset the bias and keyer settings, while it was
> on
> the bench I finished the PTT wiring (ala Phil Salas and WA1HLR).
> 
> 
> While testing it, I noticed that one 6L6 metal modulator tube was running
> considerably hotter than the other (laser thermometer)  Substituting glass
> 6L6's showed a slight glow on the plates of the tube in the same position.
> 
> Then, in AM,  the Ranger started to "talk" to me and I can't quite isolate
> the source.
> 
> Resistance and voltage checks are OK.  Before I start to take it all
> apart,
> any ideas??????
> 
> Tnx in advance,
> 
> Jim
> 
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