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Dual antenna connection

Sergey KN7KSergey KN7K Member ✭✭
I run a new coax from 6el 5m antenna and connected it to Ant2.
Ant1 is a 2el Steppir connected through Microham Power meter.
I was suprised to see that when I TX on Ant2 50mhz antenna, my power meter (that connected to Ant1) shows 0.011w and SWR 8.47. 
Any idea why I would see SWR reading from Ant 1 when I transmitting to Ant 2?
No other panadapters/slices active at that time, only slice A.
Thanks
Sergey, KN7K

Answers

  • Rick - W5FCXRick - W5FCX Member
    edited August 2018
    Sounds like you have reflected power coming back from Ant1 and it’s feedline into the SWR meter and there’s no output power on Ant2; hence, high SWR ratio of reflected vs forward power.
  • Sergey KN7KSergey KN7K Member ✭✭
    edited August 2018
    It seems like the case. Antennas about 3ft apart on small tower. It is not a problem yet as I am running 100w for now. Interesting to see what will be the reading when I will have an amp.
    Sergey, KN7K
  • Bill -VA3WTBBill -VA3WTB Member ✭✭✭
    edited August 2018
    The antenna inputs have 70db isolation. but in some cases when antennas are to close as said by Paul it is common to use a band pass filter for even more isolation when using an amp.
  • Sergey KN7KSergey KN7K Member ✭✭
    edited March 1
    Any recommendation for a band pass filters?
    Thanks
    Sergey, KN7K
  • Sergey KN7KSergey KN7K Member ✭✭
    edited March 1
    Paul,
    Thanks you for suggestion.
    Will have to check how does it look at higher power.
    Currently I just tested on 50mhz antenna with 100w from flex 6600.
    Next thing to try to TX on 1.8-28mhz with Acom 2000a and see how it will impact the 50mhz.
    If it will be an issue than will consider the filters.
    Sergey, KN7K

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