Byron, I finally got a chance to look over my notes. Our machine was
originally in the 152 mhz range
when it came out of commercial service. The amp is a model TLD5082A
which is for 150.8-162 mhz.
Model TLD5083A covers 162-174 mhz. What split is your machine? Have you
checked the power
before the harmonic filter? My notes verify that I converted the exciter
but the amp tuned down without
modification. I think we replaced or modified the harmonic filter for
one in band. Motorola did make
a 250 Watt version of this machine it's a model B83RCB.... whereas the
375 W station is B93RCB....
I think the 250 watt version had a single tupe amp but I'm not sure.
Maybe some of the Mot gurus
can let us know. Your B+ should be 1500 volts. Hope this helps.
73, 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
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>Yahoo! Groups Links
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