The Triton relies upon the ALC voltage's being generated to prevent
oscillation in the final amplifier. The diodes which generate this voltage
sometimes go bad -- often from a lightning storm in the next county. When
this is the problem, the rig will work at lower power settings but once the
drive is advanced beyond a certain point the oscillation starts. That will
give a higher reflected power reading and excessive current.
If that is the trouble, I suggest replacing not only those diodes but also
the SWR detection diodes since they are in physical proximity and sometimes
fail at the same time.
73, Mike N4NT
----- Original Message -----
From: "Louis Ciotti (KC2RVD)" <lciotti@twcny.rr.com>
To: <tentec@contesting.com>
Sent: Wednesday, December 26, 2007 4:56 PM
Subject: [TenTec] Triton IV with digital modes
I have been using my Triton IV with PSK31 and RTTY over the past few weeks,
and occasionally something odd happens.
I tun up the radio/antenna for about 1:1 using the lock position. When I
go
to transmit using rtty/psk31 I will get a very high SWR reading on the
Triton meter, and I get a weird buzzing noise coming from the 262G power
supply. I think the rig may be going into oscillation, but have no way to
verify this. Anyone else experience this?? I have been able to make some
digital contact with good signal reports, but it this is with the drive
turned way down.
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