> The TS930s had both a Carrier control and a Power control active in
> CW mode.
Find a separate carrier control in modern transceivers! In general
the carrier control is buried in a factory set-up menu as the IF gain
on each band and they are often set high specifically to avoid issues
with user complaints that they can't make full power on some bands.
73,
... Joe, W4TV
On 7/27/2012 11:32 AM, Vic K2VCO wrote:
> In some cases it depends on how you adjust the transceiver.
>
> The TS930s had both a Carrier control and a Power control active in CW mode.
> The power
> control set the point at which the ALC would hold the output. So if you
> turned the carrier
> control all the way up and adjusted the output with the power control, you
> would get some
> overshoot. But if you controlled the output with the carrier control and then
> left the
> power control set no lower than the point that ALC just started to operate,
> there was no
> overshoot.
>
> On 7/27/2012 7:32 AM, Joe Subich, W4TV wrote:
>>
>>> 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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