Mathew,
Yes, and possibly. Perhaps Decibel Products Tech Support can advise you
on the correct jumper length for a DB4001-2 filter, which is two
DB4001-1 cavities in series. Adjust all four coupling loops for optimum
return loss at the receive frequency and a total insertion loss of 1.0
dB. The jumper between the duplexer's RX output and the input to the
first bandpass cavity should be approximately 1/2 wavelength, inclusive
of the lengths of the coupling loops within the cavities at each end.
Before getting "wrapped around the axle" on this, first try using a
cable that is the same length as the jumpers on the RX side of the
duplexer. You might get lucky with a random length, and if it works
okay...
73, Eric Lemmon WB6FLY
w9mwq wrote:
>
> I am going to use two of the Decibel Products DB-4001-1 Filters on
> the receive side of my repeater once I connect a preamp this week.
> What I need to know is, is there a certain length the cable has to
> be between the two cavities that connects them together as well as
> between the preamp and the filters?
>
> Mathew
>
>
> Yahoo! Groups Links
>
>
>
>
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