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Commercial Radio Antennas - Please keep discussion related to professional, commercially used antennas and antenna systems for the two-way radio industry. Topics for the use of these antennas on amateur bands are accepted here.

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Old 08-16-2017, 10:45 AM
  Amateur Radio Operator
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Default Chinese Duplexer as a notch filter see text.

Has anybody tried this. Take a Made In China Duplexer and tune both sides for a notch
on the same frequency. Put a T Connector on the combined port and leave the two
other ports unterminated. If you tried this how did it work ?? Do not know if it would
make a mess out of the match or not.

I have a PNA so I guess I could try it and see.
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Old 08-24-2017, 5:34 PM
RFI-EMI-GUY's Avatar
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Default

Quote:
Originally Posted by KA3ODJ View Post
Has anybody tried this. Take a Made In China Duplexer and tune both sides for a notch
on the same frequency. Put a T Connector on the combined port and leave the two
other ports unterminated. If you tried this how did it work ?? Do not know if it would
make a mess out of the match or not.

I have a PNA so I guess I could try it and see.
You should sweep it. I think, to make it work, you would have to use both the transmit and receive ports (no time connector) . But that leaves the antenna port unterminated.

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