[Johnson] re: Ranger driving Thunderbolt attenuator

[Dee C. Almquist]

Hi All
That ER mod for SS pwr control of W3BYM works real well & is stable, & no
heat. I use it all the time on my modified Rangers. I changed a few
component values so I can control down to nr 0 watts to 60 watts full power.
And no flaky PA tuning on the Rangerl. Control pot goes on the crystal
socket w/ double backed tape so no holes in panel.
Regards
Dee

----- Original Message -----
From: "Peter Markavage" <manualman at juno.com>
To: <Johnson at mailman.qth.net>
Sent: Friday, July 09, 2004 2:14 PM
Subject: Re: [Johnson] re: Ranger driving Thunderbolt attenuator


> You could put in the mod that was in Electric Radio that added a variable
> solid-state control of the 6146 screen supply. Then you could control the
> output of the Ranger into the Thunderbolt. You could also run the 6146
> off the low voltage supply. Drops the output down to approx 15 watts.
> When making the 3 or 6 db pad of resistors, unless they're nonreactive
> resistors, you may have some reactive problems on some frequencies.
> Definitely don't use wire-wound resistors. I originally built my pad out
> of 2 watt carbon resistors. It got real warm on 15 and 10 meters.
>
> Pete, wa2cwa
>
> On Fri, 9 Jul 2004 11:39:30 -0500 "Ron Samchuk" <samvideo at escape.ca>
> writes:
> > 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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