[TenTec] Ten-Tec PA design

[Lynn Lamb, W4NL]

Bill, share with us the model number of the Air Pax please.  Didn't know I 
needed one with the Astron supply.

Thanks, Lynn W4NL

----- Original Message ----- 
From: "Bill Tippett" <btippett at alum.mit.edu>
To: <tentec at contesting.com>
Sent: Friday, July 14, 2006 4:03 PM
Subject: [TenTec] Ten-Tec PA design


>
>
> > 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.
>
> K0CQ:
> >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:
>
> TRANSMITTER:
> 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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