Always terminate the un-used port in a 50 ohm load. A 20 dB pad
will work here as the return loss is 40 dB.
Neil - WA6KLA
Ken Arck wrote:
>
> At 05:18 PM 6/15/2005 -0700, you wrote:
>
> > It sometimes helps to
> >use 6 dB attenuators on either side of the cavity when tuning in
> >this manner, so that a relatively uniform impedance is presented.
>
> <---I would argue that you should ALWAYS use a pad (3 or 6 dB)
> when tuning a cavity. If for no other reason, to present an
> accurate 50 ohm load.
>
> I never tune a duplexer (or cavities) without a pad on each port.
>
> Ken
>
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