[TenTec] Triton IV with digital modes

[N4NT]

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 at twcny.rr.com>
To: <tentec at 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.