Joe and the group,
I have a ham band exciter and a good 10 watts out of the driver PA, I just
can't get more than 160 watts out of the final. My dip in the plate current
is not so great and when I bring up the screen voltage the plate current
flattens out and no more power is made. I got a little more out from the
initial tune up by adjusting the antenna coupling but still 160 watts was
the max...
I do know that 400 watts is excessive but I was tuning for max power but
still staying under my plate current limit. I brought the screen voltage
back down when on the commercial frequency and left it at 350 watts or so
for quite a while. The power stayed rock solid and the PA looked clean on
the analyzer.
Just wish it would go down a bit further without mods. Oh well I guess I
will pull the plate line and see what can be done...
Bryon K0BSJ
At 12:13 PM 2/23/2006, you wrote:
>Byron, I have successfully moved a 375 watt station down to the 147
>region. Check that
>your exciter is putting out the required drive pwr in the ham band. It
>was a long time ago
>but I think I converted the exciter into the lower band by just
>replacing the components indicated
>in the parts list. (the parts list shows frequency sensitive
>components). I don't believe
>any conversion was necessary for the AMP but the conversion was done
>about 20 years ago.
>By the way, that's excessive power. We run ours well below half power by
>turning the screen
>control down.
>Good luck. Joe
>
>
>Bryon Jeffers K0BSJ wrote:
>
> >I have a Micor 375 Watt station that has the TLD5082 high power PA. I have
> >a fresh set of tubes in the station and on a commercial frequency (156.???)
> >it makes good power, about 400 watts or so.. I have tried to get it to tune
> >up on a 147.??? ham frequency but to no avail. I have heard of these going
> >down with no problem but this one just won't do it. I of course checked MOL
> >to see if the needed parts were available to convert it to the ham band
> >(TLD5081) but they are NLA...
> >
> >Has anyone converted one of these to the ham band and if so what parts did
> >you change?
> >
> >According to the manual the grid tuning cap and some other assorted coils
> >are needed, but I would like to hear from someone that has made one of
> >these work in the ham band...
> >
> >Thanks for your time!
> >
> >Bryon K0BSJ
> >
> >
> >
> >
> >
> >
> >
> >Yahoo! Groups Links
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
>
>
>
>
>
>
>Yahoo! Groups Links
>
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>
>
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