For those who may not have the Wacom catalog handy, the WP-643 duplexer
comprises six 8" cavities that are rated at 102 dB isolation at 600 kHz
spacing, with 2.2 dB insertion loss. Four of the cavities are BpBr, and two are
bandpass only. The WP-639 duplexer comprises four 5" BpBr cavities that are
rated at 80 dB isolation at 600 kHz spacing, with 1.5 dB insertion loss.
Needless to say, the WP-643 is vastly superior to the WP-639 at 2m spacing.
You could use two of the WP-639 cavities for bandpass application, if you
replaced the single BpBr coupling loop with two Bp loops on each cavity. Try
the WP-643 in stock form first.
73, Eric Lemmon WB6FLY
Brent wrote:
> With yours and Kevin's reply, I have decided to go with a set of WP-643s
> and not use the WP-639s. I believe this would get me going, and if I need
> the pre-amp, then I will add it along with the pass cavities.
>
> One more quick question: Since I have the set of 639s here, what would the
> effect of two cans from the 639s be if added to the 643's receiver side-
> besides the loss?
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