Steve,
With this scheme, the input power does not reduce. The actual
output power will of course reduce, but you are always transmitting
the most you can without destroying the finals.
Carl Moreschi N4PY
Franklinton, NC
----- Original Message -----
From: "Steve Ellington" <n4lq@iglou.com>
To: "Carl Moreschi" <n4py@earthlink.net>; "tentec" <tentec@contesting.com>
Sent: Sunday, March 10, 2002 11:06 PM
Subject: Re: [TenTec] Re: Tuners
> I wasn't aware of that but if the drive is reduced to prevent the finals
> from drawing more than 20 amps then isn't the power reduced anyway?
>
> Steve Ellington
> N4LQ
>
> When two wrongs don't make a right, try three.
> ----- Original Message -----
> From: "Carl Moreschi" <n4py@earthlink.net>
> To: "tentec" <tentec@contesting.com>
> Sent: Sunday, March 10, 2002 5:14 PM
> Subject: Re: [TenTec] Re: Tuners
>
>
> > 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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