Hi Don,
Coming to Shelby?
Have that last section of AB-105 which I will put on the trailer if you want?
73 de Dave K4DLJ
>
> From: don daso <k4za@juno.com>
> Date: 2004/08/19 Thu PM 08:20:15 EDT
> To: tentec@contesting.com
> Subject: Re: [TenTec] re Ten Tec amps and ALC
>
> The ACOM is 0 to -11volts, if my memory of conversations w/the gang
> @K4JA's station is correct
>
> Automatic Drive Level, known as ALC for short, was originally designed to
> limit grid current, preventing overdrive by applying a negative DC
> voltage "back" to the exciter/transmitter, especially useful in tetrode
> amp situations.
>
> Today, our amps require a drive level between 50-80 W for legal limit.
> You can use ALC or not.
>
> Circuits can be internal or external; they can be set by the op, or
> automatic.
>
> If external ALC isn't used, the output of the exciter/transmitter should
> be reduced using the power output control to avoid over-driving the grids
> of the amp. Some ALC circuits (like the Emtron amp) produce a negative
> 1-10Volts, proportional to the grid current, when overdriving the
> tube(s). It's not as easy to over-drive, say, a pair of 3-500Zs w/a
> typical 100W rig....
>
> And today, not all transceivers (which have generally replaced
> exciters/transmitters) have a direct ALC jack or output jack. Recent
> KENWOOD rigs, for instance, have the ALC on a DIN-plug (the REMOTE jack),
> while the FT-1000 has one.
>
> N1EU once had a good write up on ALC circuits on his web-site (along
> w/lots of other useful information on contesting/DXing/modern rigs). I'm
> sure a quick Google search would turn up that link.
>
> I gave up using ALC when I began using triodes in grounded grid. Never
> had a rig capable of over-drive.
>
> GL & vy 73 de Don K4ZA
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