yes i am aware of this, but what i am after is if anyone has the cavity
filter that is placed after the duplexor and before the aerial
all depends on price of course
Marcus
DCFluX wrote:
"Duplexer" is a generic term for a filter network that allows a single
antenna to be used for a receiver and transmitter in the same band,
such as a repeater. These usually take the form of several cavity
resonators, coaxial stubs or even helical resonators in either a band
pass, notch reject or band pass band reject.
A single cavity may be added between the duplexer and receiver if
there is alot of RF at the site and or the duplexer offers very little
out of band attenuation, But the cavity has to be a low enough quality
to have a pass band wide enough for both the transmit and receive
frequencies.
"Diplexer" is a filter network that facilitates a single antenna to be
used on 2,3 or 4 different bands, either feeding a single radio or
multiple radios. Usually constructed with L/C filter networks.
A "Combiner" is a device which allows several transmitters, very close
in frequency to use a single antenna. These are usually a dual stage
circulator followed by large band pass cavitiy per channel into a
passive power divider with enough ports to handle the total number of
channels
A "Circulator" is essentially a one way valve that allows RF to pass
in one direction. Used in combiners and for intermod control to keep
transmitters from mixing stray RF. Power refelected back from the
antenna goes into a dummy load instead of the transmitter.
On Sun, Oct 25, 2009 at 8:14 PM, Marcus <[email protected]
<mailto:[email protected]>> wrote:
thats fine, but unless i am mistaken, a Duplexor is not a cavity
filter
the duplexor is installed before the cavity filter(S) the output
of the cavity filter(S) goes to the Aerial
Marcus
K5IN wrote:
I listed Decibel products DB-4071 duplexers a couple of days ago
for $150.00 shipped.
Brian, [email protected] <mailto:[email protected]>
----- Original Message -----
*From:* Marcus <mailto:[email protected]>
*To:* [email protected]
<mailto:[email protected]>
*Sent:* Sunday, October 25, 2009 5:30 PM
*Subject:* [Repeater-Builder] Tait UHF Standby Repeater D-Band
is there anyone on this list that resides in NZ and if so/not
does
anyone have any Cavity filters, if so how much
i have a Tait Repeater running D-BAND it was a backup system
would like to get it running, forgive the contradiction, the
system is
fully operational, i would like to put it to some use
must be loads of points i have not mentioned, so if need be
fire away, i
shall answer all my old almost had it brain can conjur up
Marcus
