My Pegasus has the same circuitry but the pot wasn't labeled in the
schematics I have. Tentec told me what the pot was for when I was asking for
info after replacing my finals, which were destroyed by lightning.
I believe the current sensing resistor in the Omnis and Paragon sensed the
current for the whole rig, so putting it in the power line to the final only
was probably a refinement
Dave, VE1ADH
----- Original Message -----
From: "WA3FIY" <wa3fiy@radioadv.com>
To: "Carl Moreschi" <n4py@earthlink.net>; "tentec" <tentec@contesting.com>
Sent: Sunday, March 10, 2002 8:52 PM
Subject: Re: [TenTec] Re: Tuners
> I agree with you Carl about this being the best protection I have
> seen. As far as I know, it started with the Paragon and I believe
> it is included in the Pegasus/Jupiter. Looking at my Jupiter
> schematic here, I see a current sensing resistor in the power line
> to the PA stage. Current information from that resistor is
> conditioned and sent to the ALC circuit through a potentiometer
> labelled "Set PA Current Limit". This leads me to believe that
> the PJ's are equally like the Paragon, Omni V and Omni VI.
>
> -Lee-
>
>
> On 10 Mar 2002 at 22:14, Carl Moreschi wrote:
>
> > The Omni VI and Omni V had the best protection I've ever seen
> > for mismatched antennas. Instead of folding back the transmit power
> > by sensing SWR, they have a collector current sensing circuit that
> > adjusts drive so that the finals can never draw more than 20 amps.
> > These two radios do not require a power supply that shuts off with
> > excessive current.
> >
> > It is too bad they dropped this circuit in the Pegasus and Jupiter. I
> > bet they will have it in the Orion.
> >
> > Carl Moreschi N4PY
> > Franklinton, NC
> > ----- Original Message -----
> > From: "George, W5YR" <w5yr@att.net>
> > To: "John Buck" <kh7t@arrl.net>
> > Cc: <tentec@contesting.com>
> > Sent: Sunday, March 10, 2002 8:56 PM
> > Subject: Re: [TenTec] Re: Tuners
> >
> >
> > > John, how does this relate to the high-speed circuit breakers built
> > > in to TT power supplies and required if non-TT supplies are used?
> > >
> > > Just curious, since I read your story and then I read other postings
> > > about how a low impedance load drives the collector currents to 30
> > > amps almost instantly and if the fast breaker doesn't operate, poof!
> > > there go the finals . . .
> > >
> > > Straighten me out! <:}
> > >
> > > 73/72/oo, George W5YR - the Yellow Rose of Texas
> > > Fairview, TX 30 mi NE of Dallas in Collin county EM13qe
> > > Amateur Radio W5YR, in the 56th year and it just keeps getting
> > > better! QRP-L 1373 NETXQRP 6 SOC 262 COG 8 FPQRP 404 TEN-X 11771
> > > I-LINK 11735 Icom IC-756PRO #02121 Kachina 505 DSP #91900556 Icom
> > > IC-765 #02437
> > >
> > > All outgoing email virus-checked by Norton Anti-Virus 2002
> > >
> > >
> > > John Buck wrote:
> > > >
> > > > The TenTec design approach of designing a Crunch proof 100 watt
> > > > amplifier with at least a 3 to 1 full power capability will make
> > > > it easy to use many antennas over the whole band without tuner and
> > > > without blowing up the radio.
> > >
> > > _______________________________________________
> > > TenTec mailing list
> > > TenTec@contesting.com
> > > http://lists.contesting.com/mailman/listinfo/tentec
> >
> > _______________________________________________
> > TenTec mailing list
> > TenTec@contesting.com
> > http://lists.contesting.com/mailman/listinfo/tentec
> >
>
>
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>
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