I whole heartedly agree, Glenn, but with one say 100 Watt pa feeding a cavity duplexer, there is no phase delay issue, just a minor mis-match, that I doubt would ever be seen or heard outside the transmitter shack. The advice I was given on duplexers is once they are tuned properly, leave them alone. The difference you see from a little tweaking will not be noticeable, and external matching devices like a Z-Matcher or a tuning stub don't generally offer enough benefit to be worth while. 73, Steve NU5D
On 6/30/07, Glenn Little WB4UIV <[EMAIL PROTECTED]> wrote:
WE also use a line stretcher in TV. When you have two UHF PAs that are fed to a combiner, it is very important that the phasing of the signals be correct. We use a line stretcher in the output of the exciter to the closest PA to effectively place the PAs at the same electrical distance from the exciter. This gets the phasing correct into the combiner. When dealing with 25KW PAs, a little phase difference makes for a lot of loss in signal in the combiner. 73 Glenn WB4UIV
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