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Maximum Frequency Separation for VFOs A & B Using MultiRX?

Moose
Moose Member ✭✭
edited November 2017 in FLEX Series (Legacy) Radios
In PowerSDR using a FLEX-1500 what is the maximum frequency separation that can exist between VFOs A & B using MultiRX?

Answers

  • Al K0VM
    Al K0VM Retired Member ✭✭✭
    edited November 2017
    Moose,
      I believe it is about <48khz if using the 48000bps sample rate, 96Khz is using 96kbps.

    Al, K0VM
  • Moose
    Moose Member ✭✭
    edited September 2016
    Thanks. So if I "see" any two SSB signals I should be able to put receive windows on them both? I was trying that last night. Say I was tuned up on a signal in the middle of the panafall screen. I could tune on another that was all the way to the left or the right of the center. But if I tried to tune two that were all the way to the left and right the software would just re-center on the new one. So I would tune VFO A to a signal on the far left and if I selected a signal on the far right with VFO B it would center the panafall on the newly selected signal. I'm assuming it did this because I was beyond whatever the limit was. I tried repeatedly "walking" the second VFO farther and farther away from the other VFO, eventually it would do as I described. Next time on the radio I'll have to check my sampling rate and try to measure what separation this happens at.
    73,
    Chris AK4SK
  • Tim - W4TME
    Tim - W4TME Administrator, FlexRadio Employee admin
    edited March 2017
    A MultiRX "receiver" (VFO-B) only functions within the sampled bandwidth, which for a FLEX-1500 is approximately 48 kHz and no greater.  Now the primary receiver (VFO-A) is always fixed in the center of the spectrum display, so from a visible standpoint, you can only observe VFO-B being tuned approximately +/- 24 kHz from VFO-A's frequency. If you tune VFO-A, which tunes the spectrum display and the MultiRX VFO-B goes beyond the +/- 24 kHz limit, MultiRX will be turned off.

    There is no way on the FLEX-1500 to place VFO-A on one side of the display and the MultiRX VFO-B on the other.  To do that, you need a FLEX-6000.
  • Moose
    Moose Member ✭✭
    edited September 2016
    Thanks Tim, I appreciate the quick reply.
    73,
    Chris AK4SK

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