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Can a Flex6600M use an External 6meter Preamp without adding an External Switch Box(RTR1-A) Box

mikeatthebeach .
mikeatthebeach . Member ✭✭
edited February 2020 in FLEX-6000 Signature Series
Have a 0.5dB NF preamp with SMA connectors
Can I configure Flex6600M without the need of an
External Switch Box ( i.e. DXE RTR1-A) 

73 Mike

Best Answer

  • LarryWeber
    LarryWeber Member ✭
    Answer ✓
    The analysis above by mikeatthebeach can be misleading since it does not consider the galactic noise which is the dominant noise at 6 meters. I measured the noise figure of my Flex 6600 on 6 meters with a calibrated noise source. This gave NF = 6dB. This is reasonably close to what mikeatthebeach calculated. However when I connect my horizontal 6 meter dipole to the 6600, the measured noise goes up by 30 dB. So even if the NF of the KX3 is better than the 6600, there will be no perceived difference in the received signal to noise ratio of these two great receivers because the galactic noise is so much larger than the receiver noise.

Answers

  • paul
    paul Member ✭✭
    edited June 2018
    I was able to put a 6m preamp on the back of 6500 but 6600 does not the extra ports. paul, wa3qpx
  • mikeatthebeach .
    mikeatthebeach . Member ✭✭
    edited June 2018
    Wish Flex could configure software to either configure Rx-In with an XVTR as the Rx-Out

    Flex6600 in a 500Hz BW has a MDS of -137dBm Noise floor means a 10dF NF noise figure on 6meters

    The KX3 in the same 500Hz BW has a MDS of -145dBm Noise Floor means a 2dB NF noise figure
    on 6 meters 

    A Big difference on 6meters DX openings image

    https://www.everythingrf.com/rf-calculators/minimum-detectable-signal-calculatorimage

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