, 2006 9:24 PM
To: Repeater-Builder@yahoogroups.com
Subject: [SPAM] [Repeater-Builder] Re: Adding Bandpass Can to Duplexer
Herold,
I agree that it would be a ton easier with a network analyzer.
What happened in my case was the loop in the PD-1173 can was about
8.5 inches long (8.5" down an
Herold,
I agree that it would be a ton easier with a network analyzer.
What happened in my case was the loop in the PD-1173 can was about
8.5 inches long (8.5" down and 8.5" back up). It seemed that was way
longer as compared to what was seen in other bandpass cans. After
reading the theory p
Not exactly right.
The length of the cable between the pass cavity and a notch or pass
reject cavity has to be 1/4 wave length including the length of the
loop in the bandpass cavity and that is why the cable lengths are
different for different cavity brands that have different loop sizes.
If the
Dwayne, you are right... The cable length Mst be 1/4 electrical wave
length to come out right just like the ones on your exesisting
duplexer. This is shorter than the calculated wavelength in free
space because the RF propegates slower in coax than free space. You
have to determine the velocity
Bob,
I think you got it right on. Placing in random lengths of cables (out
of the junk drawer) between the band pass and the duplexer got
different results.
Re-reading the VE2AZX duplexer theory paper on the Repeater-Builder
web site verified that the cable should be shorter than a 1/4
wavel
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