[Amps] Ameritron AL-1500 Problem

[Keith Dutson]

Sounds like a TR relay problem, such as sticking or intermittent ground.
Have you checked the TR connection from the transceiver?  Do you have a
second transceiver?  If so, does the problem continue with the other
transceiver?

73, Keith NM5G

-----Original Message-----
From: amps-bounces at contesting.com [mailto:amps-bounces at contesting.com] On
Behalf Of Jose E. Ribeiro Sa
Sent: Wednesday, October 05, 2005 8:19 AM
To: amps at contesting.com
Subject: [Amps] Ameritron AL-1500 Problem

Good afternoon
Maybe some of you can give me a clue about this problem Iam experiencing
with my Ameritron AL-1500 amp.

A couple of days ago I switched on the AL-1500 and when I started TXing
there was no output power at all (zero watt), the HV was OK (3300 Volts),
but no IP and power mesurements in the meter. Theres an ALC reading.

I thought in could be some kind of bad contact in the 8877 lamp so I took it
off cleaned the lamp socket metal contacts put in on again and the Linear
amp. was working ok at full power. === so far so good ===

Next day when I turned it on is WAS NOT TXing again, the problem was still
there but after some tries the amplifier started transmitting at full power
again and worked all day long.

This morning again the same, but this time its not transmitting at all, I
tried to to see if I could detect any malfunction but nothing, all seems OK,
the amp. seems to be working ok, but no Power out no matter what I do.
I also noticed that the impedance between the radio and the amp has changed
because SWR in the radio is way too high (and before the match was perfect
without SWR).

I will apreciate your feedback and ideas about what might be originating
this problem.

73   Jose  CT1EEB




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