> However, according to Ameritron and Tom, W8JI (designer of
> the AL-80B), 1000 watts PEP on SSB is the upper limit as is
> 800 watts on CW.
I don't normally disagree with Tom, W8JI. However, Eimac's
data sheets on the 3-500Z - both the 1968 version and the
current (1980) version - rate the PEP Output Power of a single
tube in AB2 at 750 Watts. The 1980 version includes a set of
at 3500V on the plate that pushes the output to 900 Watts
PEP - NOT 1KW.
> The key to minimizing non-linearity is to
> tune with drive set to produce the maximum PEP that will be
> produced by the transmitted envelope and then slightly
> "over-tune" (less capacitance) the load control.
And that's not something that one can do when trying to drive
the AL-80B/K3 combination to 400 W carrier/1600W PEP output.
73,
... Joe, W4TV
> -----Original Message-----
> From: elecraft-boun...@mailman.qth.net
> [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Chuck - AE4CW
> Sent: Sunday, February 21, 2010 5:30 PM
> To: elecraft@mailman.qth.net
> Subject: Re: [Elecraft] K3 on AM with AL811H amplifier
>
>
>
> Joe,
>
> You are quite correct about limiting AM carrier power on the
> K3 to 25 watts and AL-80B carrier power to 200 watts.
> However, according to Ameritron and Tom, W8JI (designer of
> the AL-80B), 1000 watts PEP on SSB is the upper limit as is
> 800 watts on CW. The key to minimizing non-linearity is to
> tune with drive set to produce the maximum PEP that will be
> produced by the transmitted envelope and then slightly
> "over-tune" (less capacitance) the load control.
>
> Chuck, AE4CW
>
>
>
> > Don´t know how much the AL80B can handle
> > but 1600W PEP sounds to be too much.
>
> The AL-80B is a single 3-500Z. It is capable of 800W peak if
> it is to remain clean and should not be run at more than 500 W
> CW. 40W carrier from the K3 and 400W carrier from the AL-80B
> are, in both cases, grossly out of spec.
>
> The K3 should not be run at more than 25W of carrier (28W absolute
> max) and the AL-80B (or any single 3-500Z) should not be pushed to
> more than 200W carrier (absolute maximum).
>
> 73,
>
> ... Joe, W4TV
>
>
> --
> View this message in context:
> http://n2.nabble.com/K3-on-AM-with-AL811H-amplifier-tp4605487p
4609071.html
Sent from the [K3] mailing list archive at Nabble.com.
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