Output duplexers: Difference between revisions
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Rather than use a lossy expensive RF relay on the output of the DATV transmitter we can use a duplexer (for just 146 and 437 MHz operation) or a triplexer filter - as well as providing automatic band switching the duplexer (or triplexer) provides some bandpass filtering on the transmitter output! | |||
The duplexr / triplexer can be a standard unit as we all use to run a dual band VHF / UHF rig in to a dual band antennae up one co-ax or they are very simple and cheap to build - links and circuits are available on this page: | |||
* [http://www.i1wqrlinkradio.com/antype/duplex.html I1WQR's page] has several links to easily constructed duplexer designs - including one by Tony G3KTU. | |||
Revision as of 10:20, 16 January 2017
Rather than use a lossy expensive RF relay on the output of the DATV transmitter we can use a duplexer (for just 146 and 437 MHz operation) or a triplexer filter - as well as providing automatic band switching the duplexer (or triplexer) provides some bandpass filtering on the transmitter output!
The duplexr / triplexer can be a standard unit as we all use to run a dual band VHF / UHF rig in to a dual band antennae up one co-ax or they are very simple and cheap to build - links and circuits are available on this page:
- I1WQR's page has several links to easily constructed duplexer designs - including one by Tony G3KTU.