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 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! | ||
| − | 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 | + | 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: |
| − | * [http://www.i1wqrlinkradio.com/antype/duplex.html I1WQR's page] has several links to easily constructed duplexer designs - including one by Tony G3KTU. | + | *[http://www.i1wqrlinkradio.com/antype/duplex.html I1WQR's page] has several links to easily constructed duplexer designs - including one by Tony G3KTU. |
| + | *[http://oh3tr.ele.tut.fi/moppe/diplexer1.html Very simple design from OH3TR] | ||
| + | |||
| + | And of course there are loads of units you can buy from the normal sources: | ||
| + | |||
| + | *[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] | ||
| + | *[http://hamradiostore.co.uk/search/?q=duplexer Waters and Stanton] | ||
Revision as of 10:27, 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 these pages:
- I1WQR's page has several links to easily constructed duplexer designs - including one by Tony G3KTU.
- Very simple design from OH3TR
And of course there are loads of units you can buy from the normal sources: