Two feed lines on one antenna is definitely not a solution. The only isolation
would be whatever loss is in the feed lines. Basically you would be putting
high power directly into the *other* receiver. I doubt that is survivable.
Pavel has a page that specifically discusses his 80/40 diplexer. It is
definitely worth a look. That is at:
https://va6am.com/2017/01/01/4080-band-diplexer/
73,
Jack, W6FB
> On Nov 17, 2025, at 10:04 PM, john@kk9a.com wrote:
>
> As others have stated I am sure that VA6AM can make a 80/40 duplexer for you
> however the easiest approach would be to just run another feedline to your
> fan dipole.
>
> John KK9A
>
>
> Randy Farmer w8fn wrote:
>
> I'm investigating upgrading my station from its present 500W capability
> to 1500W. I've located sources for most of the up-rated bandpass filters
> and other hardware required for the project, but can't seem to find a
> source for a duplexer to split a 80-40 dipole for SO2R use. I'm
> presently using one of the Low Band Systems 500W 80/40/20 triplexers for
> this function. LBS apparently makes a 1500W 80/40 duplexer, but it
> appears the LBS stuff is no longer available in the USA. Does anyone
> have or know of a suitable 1500W unit? I do NOT need it to be rated for
> 100% duty cycle since I'm only interested in CW and occasional SSB use,
> but it needs to hold up under contest conditions with a full power
> amplifier.
>
> 4O3A makes a nice 20/15/10 triplexer, but they don't have any high power
> 80/40 units. Antennas-Amplifiers (distributed by DX Engineering) makes
> nice HP bandpass filters, but not a triplexer or duplexer. VA6AM (also
> distributed by DX Engineering) doesn't have any high power devices.
>
> 73...
> Randy, W8FN
>
>
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