[Milsurplus] Need help with ART-13

[Meir WF2U]

Bob,

 

What are you trying to load the ART-13 into? Just in case you have a 50 ohm
load you're trying to work into, you won't get a plate dip and you're going
to get a low output because the ART-13 is not designed to work into that
kind of load. Try to connect a 500 pf variable capacitor from the antenna
connector to ground and tune that as well, you should achieve a plate
current dip and the  normal output power.

 

73, Meir WF2U

Landrum, SC

 

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From: milsurplus-bounces at mailman.qth.net
[mailto:milsurplus-bounces at mailman.qth.net] On Behalf Of Robert Watson
Sent: Tuesday, March 08, 2011 12:28 PM
To: Milsurplus at mailman.qth.net
Subject: [Milsurplus] Need help with ART-13

 

I have acquired an ART-13 (ATC model) and am having trouble getting it on
the air.
My power supply provides 26vdc, 400vdc and 1200vdc.  I powered up the
transmitter and the battery meter functrion indicates normal.  In tune mode
and using manual channel, I see appropraite amount of grid current when the
test switch is operated.  When I place the meter switch in the plate
position, the meter immediately pegs off scale to the left.  If I operate
the test switch, no change in the reading.  My power meter indicates that
approximately 30 watts of carrier is present at the transmitter output and
the antenna current meter does show  a low value.  No increase in output
power no matter where I position the tune and load controls. I am able to
adjujst frequency OK. Hopefully, I am overlooking something. 
 
I would appreciate any suggestions for troubleshooting.
 
Many thanks,.
Bob, KN4HH


     
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