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    8600 GPDSO / 10 MHz Reference

    Member ✭✭
    in FLEX-8000 Signature Series

    I am able to sync up the gpsdo …

    image.png

    and the radio is locked (blue light on pwr button). However when looking at the 10 MHz Reference in Auto it shows searching…

    image.png

    Not sure why it does not lock. It does show lock if I choose the txco.

    regards

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    Best Answer

    • Member ✭✭
      Answer ✓

      Len,

      I have been working with Tim on this. He just replied and said that they are going to send me a replacement GPDSO..

      thx

    Answers

    • Member ✭✭

      So I did some more research and leaving the 10Mhz on Auto screws up the frequency offset. I found out by monitoring FT8 transmissions and it looked like signals were out of the 3KC bandpass range. When I switched back to TXCO the 10MHZ locks and FT8 signals look normal on the waterfall. Here is 40 meters with the TXCO

      image.png

      Now with the 10 MHz Reference to Auto

      image.png

      The gpdso shows searching…

    • Member ✭✭✭

      Is there a different setting other than Auto in the Reference drop down box that you can select? Maybe one specifically for the GNSS receiver.

      James

      WD5GWY

    • Member ✭✭

      yes . Auto, gpdso, or txco. It only locks on txco. I have a support ticket in.

      Thx

    • Member ✭✭

      Here is what you see when gpdso is selected…

      image.png

      Here is the gps status

      image.png
    • Member ✭✭

      Can you still lock to WWV? Is that what TXCO is?

      John N1JM

    • Member ✭✭

      Yes the TXCO lock is fine. It's just the gpdso lock that the 10mhz reference will not lock on..

    • Member ✭✭

      So here is the issue I am currently locked on my gpdso on about 13 - 15 satellites out of 30

      image.png

      However the 10 MHz Reference source will not lock on the GPDSO. It does not even see the GPDSO.

      image.png

      I assume if it finds the GPDSO the button will be blue not grey. Can anyone tell me if there is any other status other than searching or locked?

    • Member, Super Elmer Moderator

      Hi Mick, what John is asking is if there is still a WWV calibration available to adjust the TXCO. That is how it is done on 6000 series radios.

    • Member ✭✭
      edited March 25

      Len,

      yes you can use the txco to do a calibration . From what I read a 6xxx radio with gpdso can also be used for the 10 MHz Reference. For what it is worth I am up to 16 - 17 tracked satellites and with no sync on the 10 MHz Reference. I don't understand why the 10Mhz does not even see the GPDSO.

      Here is the txco being used…

      image.png

      Now here is where the reference does not even see the GPDSO.

      image.png

      There is also this note…

      image.png

      However the slice frequency readout is about 1KC off when I try to use the GPDSO .

    • Member, Super Elmer Moderator

      Ah, ok, I see. I would submit a help desk ticket.

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