Mobile diplexer mounting location?

Discussion in 'Antennas, Feedlines, Towers & Rotors' started by N5YIZ, Jun 14, 2021.

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  1. N5YIZ

    N5YIZ Ham Member QRZ Page

    Which is the best and why?

    PXL_20210614_033114908.MP.jpg
     
  2. N7VGO

    N7VGO Ham Member QRZ Page

    This would be just me, but I would pick "B" as long as you are using good coax. And why I would choose "B" is that there is less coax running around the car.
    Sorry it is not technical but it is just me

    Val (N7VGO)
     
  3. N5YIZ

    N5YIZ Ham Member QRZ Page

    Yeah, I searched all over the net and couldn't find the answer. It seems like "A" would be best, but I can't wrap my head around why. Also, if you disconnect either radio, do you need to terminate the open port?
     
  4. WE4E

    WE4E Premium Subscriber QRZ Page

    Functionally, there's no difference. The coax length is the same, so losses will be also. The insertion loss of the diplexer is the same no matter where it is. No, you don't have to terminate the open port.
     
  5. N5YIZ

    N5YIZ Ham Member QRZ Page

    Thanks. That does make sense. I'm mounting a UHF deck and a dedicated APRS radio under the seat of my truck. The space is limited with just the radios, so I'll have to move the diplexer under the dash near the glove box and run another line.
     

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