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[TenTec] Ten-Tec PA design

To: tentec@contesting.com
Subject: [TenTec] Ten-Tec PA design
From: Bill Tippett <btippett@alum.mit.edu>
Reply-to: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Date: Fri, 14 Jul 2006 16:03:18 -0400
List-post: <mailto:tentec@contesting.com>

 > K4KGY wrote:
 >  >The question of why TT didn't included a breaker instead
 > of a fuse--well in a way they did--it's in their matching power
 > supply. This is an electronic breaker not a magnetic and it works
 > as good if not better than the magnetic. The fuse in the rig is
 > then just a backup to protect the wiring system in case the
 > breaker should fail and to protect same if someone uses other
 > than a TT power supply. TT has always recommended to use an
 > Air-Pax breaker if their power supply was not used and if sized
 > correctly it works fine.

I replied:
 >          Thanks Jim!  Someone else responded privately that
 > Orion internally has a current limiting circuit (see below):
 > The Orion I has a "current limit" circuit in it that limits the PA supply
 > current by reducing RF drive to the PA when current exceeds a set level.
 > Reference A5 ALC Circuitry  R19  and A0 Input/Output R63 sense resistor.

         I just called Ten-Tec service and they
said Orion *does* need the external circuit breaker
when a non-TT power supply is used.  I told them
they needed to add that caution to both Orion manuals
since the caution is *not* there now.

 >ALC circuitry!! Just a couple days ago I was told there was NO ALC
circuitry in the Orion. Just after I'd pointed out that ALC could lead
to faster rise times and a sharp transition from rise to level that
could contribute to key clicks...

 >So there is ALC inside the radio and it can have that effect.

         I don't know who told you that but there has always
been ALC in Orions from day 1.  The ALC light is to the right
of the Meter and TT's Orion webpage specification states:

Power output: Adjustable 5-100 W, +/- 1 dB, ALC controlled.

         Anyway I just learned something after 3 years
of owning Orion and will get one of the Air Pax breakers.

                                 73,  Bill  W4ZV

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