[Johnson] re: Ranger driving Thunderbolt attenuator

[James M. Walker]

Ron,
My T-Bolt setup included the Pacemaker, and Thunderbolt, and I think a
couple
of points are in order, for the attenuator per the manual.

I built the one for the pacemaker, using the recommended 2 watt resistors,
also added
a 220VAC rotron fan in the box, and one side covered with perforated panel.
The thing gets warm during use on AM as the output of the pacemaker is 30
watts in that mode.

Now the caveat, the T-Bolt manual suggests a 60 inch cable between the
pacemaker
and the attenuator, with a coaxial barrel between the attenuator and the amp
input. I
saw it and ignored it until I noticed the 6146 plate was wandering all over
on AM, DON'T leave the cable out as it IS necessary.

If you build your attenuator, try to provide some means of cooling the
resistors as they
do get hot, and the smell WILL drive you crazy (essence of OHM)!

I might mention that the last T-Bolt runs well with the pacemaker on CW/AM
Jim
WB2FCN
http://eshop1.chem.buffalo.edu


----- Original Message -----
From: "Ron Samchuk" <samvideo at escape.ca>
To: <Johnson at mailman.qth.net>
Sent: Friday, July 09, 2004 12:39 PM
Subject: [Johnson] re: Ranger driving Thunderbolt attenuator


Hi everyone.  I have both the Ranger and Thunderbolt.... both in good
working condition.  I have the diagram for the Johnson attenuator using
about two dozen resistors, but before making it up, is there any other
'simpler way' to reduce the drive the Ranger and still get positive peak
modulation along with the required drive for the Thunderbolt?  Any
suggestions or comments will be appreciated.  Thanks from Ron VE4SR in sunny
Manitoba, Canada.
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