On Sat, 24 Jul 2004 23:42:42 +0200 "Peter van Daalen"
<peter@pmvandaalen.demon.nl> writes:
> Hi all, I am new to this list and need some help.
Hi Peter,
Welcome to the group!
> In various ( linear SSB ) 4CX 1500B PA designs I have seen various Vg2
> voltages from + 225 V until +300V.
It may be useful to make it adjustable over that range.
> As far as I could recall, the lower the Vg2 the lower the IM3.
Generally true.
> What could be the reason for designing a ( SSB linear ) 4CX1500B
circuit
> with Vg2 at 300 V ?
Higher Vg2 will allow for higher peak power output.
> End of all, one of the reasons to choose for a 4CX1500B is the relative
low
> IM3.
Yes!
> What are pro's and con's of such high Vg2 ?
More peak power capability at slightly higher distortion.
225 volts is allows for about 900 watts; 250 volts is good for 1400
watts or so.
In either case, the distortion is lower than 99.9% of the driving
transmitters out there.
> EIMAC's " Care and feeding.. " does not resolve this question for me.
> Who could ?
Maybe this group? :-)
>
> Thanks.
> Peter, PE1ECM
>
73 & Good morning,
Marv WC6W
*
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