Telewave is VERY responsive to e-mails and even phone calls. I've had technical
questions about their duplexers on several occasions and have sent e-mail to
their only public e-mail address. Usually I get a reply later the same day or
first thing in the morning from a man named Ray Collins. Turns out he's the
president of Telewave and very nice to converse with. Highly recommended.
I will offer this, however. Celwave (and possibly other manufacturers) seem to
have "cut lists" which specify the lengths of coax you need between cavities
and from the last cavity to the TEE connector. Telewave doesn't seem to have
them; I've asked in the past and I'm always told they make each cable set on
the shop floor when the unit is attached to expensive analysis equipment,
starting with some known (but un-publicized) length, just to get it close, then
they "trim to fit" until the unit performs as they want it to. In actuality,
they may have a bunch of cables all made in various lengths by 1/4 inch
increments, then select the right ones to get the desired performance.
You probably wanted a TPRD1454 unit, if they make one, as that would have the
right cable lengths and configuration for the 2 meter band.
Bob M.
======
--- On Fri, 7/25/08, garyp609 <[EMAIL PROTECTED]> wrote:
> From: garyp609 <[EMAIL PROTECTED]>
> Subject: [Repeater-Builder] Re: How to figure cable length for duplexer?
> To: Repeater-Builder@yahoogroups.com
> Date: Friday, July 25, 2008, 7:09 PM
> Jim,
> Thanks for the response. The duplexer is a Telewave
> TPRD1554. They
> are brand new and bought from Tessco tuned. The cable on
> the RX side
> is marked 11" in black marker on the connector and the
> TX side is
> marked 11 1/2 ". Both cables terminate at the T. I
> just want to feel
> assured that they are the right length as I feel my
> performance
> should be much better and want to rule out the duplexer.
> Gary K2ACY
>
> --- In Repeater-Builder@yahoogroups.com, Jim Brown
> <[EMAIL PROTECTED]> wrote:
> >
> > What kind of duplexer is it? I have several older
> Sinclair 2 meter
> duplexers that were up in the 170 mHz range that I moved
> down to the
> ham band, and I had to replace each 10.5 inch cable that
> went from
> the can to the Tee with a cable 12.5 inches long. Turns
> out for
> those older models that piece of cable was part of the
> tuned circuit
> for adjusting the nulls.
> >
> > All duplexers are not made the same, so I think you
> need to be more
> specific. Interesting on the frequency you are using.
> We are just
> putting one on the same frequency here in central New
> Mexico - HI.
> >
> > 73 - Jim W5ZIT
> >
> > --- On Fri, 7/25/08, garyp609 <[EMAIL PROTECTED]>
> wrote:
> > From: garyp609 <[EMAIL PROTECTED]>
> > Subject: [Repeater-Builder] How to figure cable length
> for duplexer?
> > To: Repeater-Builder@yahoogroups.com
> > Date: Friday, July 25, 2008, 5:46 PM
> >
> > Output frequency is 145.450 & input is
> 144.850. How do
> I figure out
> >
> > what length the cables should be between the rx side
> and tx side
> that
> >
> > connect to the T-Connector? Thanks and 73's !
> >
> > Gary K2ACY
