Anyone make a 1-30MHz and 40-54MHz Diplexer?

[70cutlass442]

looking for a commercially available diplexer to run 11/10M and 40-54mhz on one antenna run. I have seen people build them for those ranges however I lack the knowledge and equipment for such a project.

 

[Thunderknight]

Comet and Diamond both make them that split at 30 and 49 MHz. It might work lower to extent, but all the way down to 40 is not much separation to 29.7 MHz. I think I saw both over at dxengineering.

 

[KB4MSZ]

Oops, wrong one

 

[70cutlass442]

Oops, wrong one

I will need to get that down to 43MHz for a business channel. Not sure how narrow these are but 6MHz is pretty substantial unfortunately.

 

[KB4MSZ]

That's a deal killer I'm afraid.

 

[prcguy]

I just tested one of my Comet diplexers with a 10m/6m split and the high side is good down to 46.5MHz then it goes off a cliff.

 

[70cutlass442]

I just tested one of my Comet diplexers with a 10m/6m split and the high side is good down to 46.5MHz then it goes off a cliff.

That is good to know! Might still work then. I need to see what business pair we get.

 

[prcguy]

46.5MHz was low loss like .2dB then at 46.0Mhz it was creeping up to .6dB, probably useable there at lower power. Different units may have slightly different tuning. I suspect you could tweak the coils inside to push the frequency down a little.

That is good to know! Might still work then. I need to see what business pair we get.

 

[70cutlass442]

46.5MHz was low loss like .2dB then at 46.0Mhz it was creeping up to .6dB, probably useable there at lower power. Different units may have slightly different tuning. I suspect you could tweak the coils inside to push the frequency down a little.

Thanks for checking on that! that answers alot of questions on my end.