Hi Gary,
It's not exclusively related to the Loaded and Unloaded
Q of the Cavity.
Cavities do get warm under extreme conditions, but
I've yet to feel a typical two-way radio cavity rise
more than warm to the touch in high power pager type
operation.
I have seen some "small cavity" mfgrs place hefty heat
sinks on the high current end of a cavity... but none
of the mfgrs has actually offered up the honest technical
reason why they use them.
I once heated my lunch on a multi section tx band pass
cavity used by KFOG FM in San Francisco (Sutro Tower
Site). The high current end of the cavity would almost
boil water during normal high power fm broadcast operation...
Was very impressive...
Back to square one of the topic. One can set up a band
pass cavity using a service monitor. The final tx side
BP Cavity adjustments should be checked with a watt meter
(or two) included... under actual rf power.
cheers,
skipp
> [EMAIL PROTECTED] wrote:
> Skipp.....Thank you for the info on duplexer tuning with
> RF power change. Interesting. Maybe expansion of the
> actual can due to heat vs Invar rods?
> Gary
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