[Johnson] T'bolt afterburner for AM

[James M. Walker]

Welll,
Yes and no, actually 600 is more than enough, but I have never run mine that
hard! I tune in CW mode from the 10B exciter, set the power out at 400 watts
to the dummy load, and then antenna. Then switch to AM mode insert the 
carrier
for proper levels out of the T-Bolt and then apply audio. Result is a clean 
sounding
(not mushy) and loud signal for folks that like that.

As for the Heating problem, I find the fan blowing across the 4-400As from 
the
side adequate, and assuming you have the chimneys there is also a fan under 
the
chassis that blows up thru there and then out. I use solid State 
replacements
for the 866/3B28 and that helps, but the real heat is generated in the 
regulator
compartment, which has virtually no direct air from either fan.

YMMV
Jim
WB2FCN
2 and counting!

----- Original Message ----- 
From: "John Lyles" <jtml at losalamos.com>
To: <johnson at mailman.qth.net>
Sent: Tuesday, February 20, 2007 11:41 AM
Subject: [Johnson] T'bolt afterburner for AM


> Thunderbolt is rather anemic, with regards to output. It is a 1 kW 
> input-rated amplifier, and the output is approx 600 watts before it runs 
> out of steam. I have one here at work, used for various tests, and it was 
> hard pressed to get much over 600. The fact that it can be driven into AB2 
> helps. If it is run full throttle on AM, add a fan outside the cabinet, to 
> help cool the 4-400As.
>
> 73
> John
> K5PRO
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