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6700 High SWR at the end of a transmission

Ross Biggar
Ross Biggar Member ✭✭
in FLEX-6000 Signature Series

Operating my 6700 I am seeing a high SWR of 1:1.6 and higher on tune and at the end of each SSB transmission.

I am using the 6700 into an OM Power amplifier, and then to a 4 element Steppir, and measuring /checking the SWR during transmission by an Array Solns Powermaster II. The odd thing is with the amplifier operating, the SWR comes down to about 1.06, which is what I would expect for the Steppir, BUT at the end of each transmission I can see the SWR shoots up to 1.6 or higher on the Powermaster II as the 6700 stops transmitting.

It happens on all bands, not just 20m.

I have just replaced the 6700 with one of my 6600,s and the SWR is constant at 1.06, , the SWR does not alter at the end of a transmission, so the problem is not the coax, the amp or the Steppir.

So what in the 6700 could be causing the problem, advice please.


Regards

Ross

ZL1WN

Answers

  • Ross Biggar
    Ross Biggar Member ✭✭

    6700 High SWR at the end of a transmission

    Ross Biggar

    Ross Biggar Member ✭✭ 12:54PM

    Operating my 6700 I am seeing a high SWR of 1:1.6 and higher on tune and at the end of each SSB transmission.

    I am using the 6700 into an OM Power amplifier, and then to a 4 element Steppir, and measuring /checking the SWR during transmission by an Array Solns Powermaster II. The odd thing is with the amplifier operating, the SWR comes down to about 1.06, which is what I would expect for the Steppir, BUT at the end of each transmission I can see the SWR shoots up to 1.6 or higher on the Powermaster II as the 6700 stops transmitting.

    It happens on all bands, not just 20m.

    I have just replaced the 6700 with one of my 6600,s and the SWR is constant at 1.06, , the SWR does not alter at the end of a transmission, so the problem is not the coax, the amp or the Steppir.

    So what in the 6700 could be causing the problem, advice please.


    Regards

    Ross

    ZL1WN

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  • Gordon, ve7on
    Gordon, ve7on Member ✭✭

    Is it possible that you are reading the SWR to the input of the amp for the brief moment after the amp stops amplifying?

    Gordon, ve7on

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