TX/RX will be very close to that as it is the nature of
ganging 2 pass /reject cans on each side of a duplexer... 2 cans on
each side actually widens things out as compared to one, but 2 are
deeper passes and reject notches than one.... three cans gets
wider/deeper yet... 4 cans winds up in mhz wide as apposed to khz
wide... ( as in an rx preselector, the more cans the wider it is....)
If it was tuned correctly in the first place the 1db window
is probably about 150 khz wide on each port or more..., usually
equally distributed on each side of the center freq...the notch may
be a bit sharper but within 50khz is normally no tune needed if it
was correct in the first place...
Doug
KD8B
At 12:14 PM 6/27/2008, you wrote:
>I have a TX/RX Vari-Notch duplexer. Would the same thing apply to no
>re-tuning?
>
>--- In
><mailto:Repeater-Builder%40yahoogroups.com>Repeater-Builder@yahoogroups.com,
>"Steve Bosshard (NU5D)"
><[EMAIL PROTECTED]> wrote:
> >
> > Most band pass / band reject will be plenty wide - I measured over
>200
> > Khz on a Wacom 678 that I use with 3 UHF close spaced combined
>trunking
> > repeaters (some minor loss). I don't believe re-tuning will be
>needed.
> >
> > Steve NU5D
> >
> >
> > garyp609 wrote:
> > > If a repeater was on 447.575 and the frequency was changed to
>447.5625
> > > would the duplexers need to be re-tuned?
> > > Thanks & 73's
> > > Gary K2ACY
