--- In [email protected], Eric Lemmon <[EMAIL PROTECTED]>
wrote:
> Paul,
> ...snip...
> A 100W repeater normally requires 100
> dB of isolation for zero desense, and that usually calls for six
> cavities. However, I have used a Q-202G duplexer with two added
> bandpass cavities on the receive side, and it had zero desense
with a
> 100W PA.
>
> 73, Eric Lemmon WB6FLY
>
>
>
Hi Eric and others
Question...I have the same duplexer and was thinking of adding a
couple of bandpass filters as well. Does the 14" cable length apply
to the added on cavities as well? And should they be installed
between the antenna port and first RX cavity or between the last RX
cavity and receiver or does it matter? I know the cabling for this
duplexer is kinda funky so I'm wondering just where in the cabling
scheme of things any add on filters should be added and their cable
lengths.
I have a DB Products 4 can bandpass duplexer 150/160 mHz or so
that's just sitting around doing nothing and I figured I'd put some
of the cans to some use. The model is a DB 4044 but I don't know if
the rods are long enough to tune to 146.775/.175 mHz (my 2 meter
frequency)...never tried to tune it down low. Its currently on
152.915/159.900.
If they can be used, should the add on cans be tuned independently
and then the whole shebang re-tuned? All I have is a couple of
simple service monitors with no spectrum analyzers or network
analyzers...would I be able to get "close enough for government
work" do you suppose? I'm not sure that there are any "qualified
filter tuners" in my area (piedmont of NC).
Thanks and Happy Holidays!
Bob, GMRS WPVV845, Amateur KG4WAD, LMRS WPXC892
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