The T-1504 works very well if clean. The notches are difficult to tune
perfectly if the inside of the cavity has been exposed to moisture. I
have opened up cavities and cleaned with steel wool and coated with
light grease and they tune much better.
I am not sure if anyone else has had this problem, but with these
duplexers I have had a hard time with tuning a pair of cavities with
the stock phasing lines. I seem to be getting "double peaks" and the
peaks just won't pull together down around 443 MHz. I went and made
new phasing lines out of the same type cable, but just 1/2 inch longer
on all lengths. Now the peaks pull together, therefore resulting in
sharper pass band and less loss. Maybe it was just mine.
73, KC4FWC
--- In Repeater-Builder@yahoogroups.com, "Kevin Berlen, K9HX"
<[EMAIL PROTECTED]> wrote:
> A Motorola T-1504 series is an excellent choice. Should be available
used
> for $125-$150. 73,
>
> Kevin, K9HX
>
> At 12:10 PM 4/12/2005, you wrote:
>
> >Do you have any recommendations on 70cm duplexers capable of 100W?
> >
> >Thanks
> >
> >
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