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WG3K > TECH 03.11.24 17:29l 19 Lines 1376 Bytes #999 (0) @ WW
BID : 9769_WG3K
Read: GUEST
Subj: Multiplexers for HF
Path: IW8PGT<IZ3LSV<DB0ERF<DK0WUE<DK0WUE<VK5RSV<VK5MAR<VK5LEX<VE3KPG<N2MH<
KA1VSC<WG3K
Sent: 241103/1626Z 9769@WG3K.#SMD.MD.USA.NOAM LinBPQ6.0.24
Most hams are aware of, and might use, a duplexer or triplexer on their VHF and UHF radios. Being able to share a multiband ant
enna with multple radios of different bands is certainly a plus when you have limited real estate on a vehicle or even at home.
But did you know that duplexers and triplexers (really, multiplexers) are available for HF antennas as well?
I suspect most hams have their multiband HF radios tied to one or more HF antennas and probably not the other way around. But w
hat if you wanted to attach multiple radios to the same antenna? Steve, KB9PVH, alerted me to this fact and, after a bit of res
earch, I found VA6AM's HF multiplexers[0] (I believe the ones Steve uses are made by a different company).
So, now I know how to share my HF antenna, by why would I want to do such a thing? For my use-case, I want to have multiple HF
radios attached to my BBS (via Netrom) so I can support multiple bands simultaneously (including cross-band connections). Some
contest or DXpeditions could use these if antenna space is at a premium and they wanted to put multiple radios on the air at th
e same time. I'm sure there are other use-cases for such a device.
So, the next time you wish you could use that one really good HF antenna you have for multiple radios, now you can.
[0] https://www.dxengineering.com/search/part-type/transmit-multiplexers
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