On both my AL80B and AL1500 the Ameritron meter is significantly low on
10m, improving as you go down in bands. I don't think the metering
circuit shares the power supply board in the 1500.
Bob W2WG
-----Original Message-----
From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com]
On Behalf Of Floyd Sense
Sent: Sunday, March 16, 2003 7:39 AM
To: amps@contesting.com
Subject: [Amps] Accuracy of Ameritron forward power meter?
Has anyone here checked the accuracy of the forward power meter on the
Ameritron amps that share the same power supply board as the AL-80B?
(That
would include the AL-800, AL-800H, maybe others?)
I recently had to replace the toroid in the power/SWR sensing circuit,
along
with several other components in an 800H that came from the previous
owner
with extensive electrical damage in that area. When comparing the
forward
power output with a Bird 43, I note that the readings are on the button
with
the Bird on 160 and 80, but the Ameritron meter reads almost 500 watts
low
on 10 meters, with less discrepancy as you move down in frequency.
I suspect the problem might be the lack of a copper or brass shield
between
the toroid and the conductor carrying the RF.
K8AC
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