Difference between revisions of "Output duplexers"

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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 (for 146, 437 and 23cms operation) filter - as well as providing automatic band switching the duplexer (or triplexer) provides some bandpass filtering on the transmitter output!
  
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!
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[[File:tx filter 1.JPG|600px]]
  
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.
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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 these pages:
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*[http://www.i1wqrlinkradio.com/antype/duplex.html I1WQR's page] has several links to easily constructed duplexer designs - including one by Tony G3KTU.
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*[http://oh3tr.ele.tut.fi/moppe/diplexer1.html Very simple design from OH3TR]
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And of course there are loads of units you can buy from the normal sources:
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*[http://www.hamradio.co.uk/search.php?txtSearch1=duplexer&hidSpnSearch1=MyDEL+MX-72N+2M%2F70CMS+DUPLEXER+SO-239+IN+PL+%26+%22N%22+OUT&hidSpnProdId1=6072&srcType=SP&flagSearch=Y&searchProdId=&dispSearchVal=&selSpanId=0&cntSpanId=1 Martin Lynch]
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*[http://hamradiostore.co.uk/search/?q=duplexer Waters and Stanton]

Latest revision as of 09:05, 25 February 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 (for 146, 437 and 23cms operation) filter - as well as providing automatic band switching the duplexer (or triplexer) provides some bandpass filtering on the transmitter output!

Tx filter 1.JPG


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 these pages:

And of course there are loads of units you can buy from the normal sources: