> Why not just use the RF PWR adjustment on the front of the
> transceiver and save all that costs and wasted heat dissipated by the
> attenuator.
Because many transceivers designers - particularly Icom - control Power
with the ALC circuit. That does nothing to stop the spike due to a
slow ALC attack time and excess IF gain (excess drive to the PA).
73,
... Joe, W4TV
On 7/27/2012 10:11 AM, Jim Hargrave wrote:
> Duh...
> Why not just use the RF PWR adjustment on the front of the transceiver and
> save all that costs and wasted heat dissipated by the attenuator.
>
> "Discipline" is the keyword. With proper drive power management, most
> linears will operate trouble free for decades.
>
> I have a Clipperton-L (1980) with the original tubes. I also have a
> homebrewed 4-400(2) that I built in 1979. I did not even bother to include
> an ALC circuit. Both have been trouble free.
>
> 73s de Jim
> W5IFP
>
>
>
>
> > -----Original Message-----
> > From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com]On
> > Behalf Of Michael Tope
> > Sent: Friday, July 27, 2012 8:37 AM
> > To: amps@contesting.com
> > Subject: Re: [Amps] Overdrive protection
> >
> >
> > On 7/27/2012 6:13 AM, Michael Tope wrote:
> > >
> > > With an extra SO-239 on the rear panel and a coax jumper, the amp
> > > manufacturer could provide a "loop-thru" for an external power
> > > attenuator. This would allow the user
> > > to tailor the drive requirements of the amplifier to their transceiver
> > > output characteristics by selecting the appropriate attenuator value.
> > >
> > > 73, Mike W4EF.....................
> > >
> > Oh, duh, I should have said two extra SO-239s, otherwise you couldn't
> > insert the attenuator after the input T/R relay.
> >
> > Mike W4EF.................
> >
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>
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