I purchased a duplexer a while back so that i could connect my VHF and UHF to one antenna. I followed the instructions for installing and everything works fine. I noticed on the duplexer the pl259's are band specific labeled, makes sense. Out of curiosity what inside the duplexer makes one port specific to that band?
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Duplexer/Triplexer Question
- Thread starter Colton25
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n5ims
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There are filters that send the appropriate signal from the combined connector to the one specific for that filter's bandpass. For a two port one with a common, a VHF and a UHF connection, there will be two filters. One that will pass the VHF signals (and block others) and the other that will pass the UHF signals (and block others). That's how you can split out (or combine) the two bands without side effects.
Makes sense, so it wouldn't be a good idea to defer away from what the port is specified for? The reason I ask is because I want to add another VHF, unfortunately I haven't found any with 2 VHF plus 1 UHF port. What would happen if I used a triplexer and utilized the additional port for VHF? Additionally I would only ever transmit on VHF and if need be I could limit that to one specific VHF radio. The other 2 radios would be for monitoring only, so I would think even if the radio doesn't match the band specified on the triplexer I would still be capable of receiving correct?
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The filter will only pass RF that it states on each port. It filters out other frequencies. This is how you can transmit on a VHF radio and not blow the UHF radio up.
Hmm ok so my idea won't work, I guess I could just connect the 2 receive only radios to a splitter but that would require a second antenna, my main goal is trying to keep limited to 1 antenna.
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WQPW689
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I use Stridsberg's fine multicouplers:
Receiver Multicouplers, Passive and Active, HF to VHF/UHF
For my purposes the MC204 four port passive model works just fine. They're wideband so just connect all your scanners to one antenna and listen away.
Receiver Multicouplers, Passive and Active, HF to VHF/UHF
For my purposes the MC204 four port passive model works just fine. They're wideband so just connect all your scanners to one antenna and listen away.
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But i can't combine a TX radio with RX only radios on one multicoupler right? Wouldn't the TX go back into the other radios causing damage?
WQPW689
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Might be a question for Stridsberg. They have a phone support outfit. I don't connect my ham handhelds to that coupler anyway out of general principles of not wanting to transmit too close to my four bunched up scanners/receivers.
Is there some kind of inline filter i can use to keep power from going back into the receive radios?
prcguy
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Your current diplexer will allow you to transmit on UHF while receiving on VHF. The suggestion of using a Stridsberg multicoupler will allow you to connect more than 2 VHF receivers to the VHF side of the diplexer without any loss.
You would not want to connect a VHF receiver with a VHF transceiver or two VHF transceivers on the same VHF port of the diplexer because if you accidentally transmit, something will break.
prcguy
You would not want to connect a VHF receiver with a VHF transceiver or two VHF transceivers on the same VHF port of the diplexer because if you accidentally transmit, something will break.
prcguy
I would need to transmit on one of the VHF's so i won't want to use a multicoupler connecting my 2 VHF radios to the antenna. What if i split the cable coming from the NMO 2 ways and then used 2 separate duplexer's? So one cable from the splitter has a duplexer connected to 1 VHF and 1 UHF (the setup i have now), then i can take the second cable from the splitter, using a second duplexer and connect this duplexer to my second VHF. This way all three radios are protected by a duplexer, i know this sounds complicated hopefully i explained it well enough for everyone to understand.
The VHF will still pass back to the other VHF. Best and cheapest will be two antennas.
prcguy
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A diplexer cannot separate two VHF radios and allow one to transmit in the way you need. The only solution would be another VHF antenna but the diplexer can still allow the UHF radio to work with a VHF transceiver or receiver.
prcguy
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