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  • [G3XBM] 10FT8R Schematic

    From G3XBM via rec.radio.amateur.moderat@21:1/5 to All on Fri Apr 30 12:25:28 2021
    XPost: rec.radio.amateur.moderated, rec.radio.amateur.homebrew, uk.radio.amateur
    XPost: free.uk.amateur-radio

    Roger G3XBM's (Mainly) Amateur Radio Blog

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    10FT8R Schematic

    Posted: 29 Apr 2021 09:14 AM PDT http://g3xbm-qrp.blogspot.com/2021/04/10ft8r-schematic.html





    I am sorry this is hand drawn for now. With my addled brain it is much
    harder to learn new schematic drawing packages. I thought it better to put
    up a hand drawn sketch than nothing. Even doing the schematic by hand was hard.
    The inductor next to the crystal was added to pull low cost 14.040MHz
    crystals down to 14.037MHz. In my case I used a T37-6 core with about 6uH inductance. I DC isolated the connections to the PC mic input.
    I use the shack 13.8V PSU, but it will probably work with batteries with
    lower voltage although I have not tried this. Some resistors may have to
    change in value.
    The Polyakov mixer diodes could probably be replaced with matched germanium ones.
    If you can improve it please let me know!

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    OFCOM changes

    Posted: 29 Apr 2021 05:23 AM PDT http://g3xbm-qrp.blogspot.com/2021/04/ofcom-changes.html


    OFCOM has changed some licence exemption conditions for short range
    devices. See the OFCOM website for details.

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    Rally postponed

    Posted: 29 Apr 2021 05:16 AM PDT http://g3xbm-qrp.blogspot.com/2021/04/rally-postponed.html


    The Dartmoor rally, which was due to take place May 3rd, has been postponed
    to July 4th. Let's hope that by July things are far more normal.

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    10m FT8 RX

    Posted: 29 Apr 2021 02:14 PM PDT http://g3xbm-qrp.blogspot.com/2021/04/10m-ft8-rx_29.html


    Most of the morning I've been on 10m FT8 RX with the tiny indoor loop
    antenna and my homebrew 10FT8R RX. It is now 1052z and nothing spotted yet today.
    UPDATE 1458z: No spots so far.
    UPDATE 2113z: Just one German spotted. QRT soon.

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    External 10m antenna

    Posted: 28 Apr 2021 11:26 PM PDT http://g3xbm-qrp.blogspot.com/2021/04/external-10m-antenna.html


    Small steps....
    The first stage was to drill a hole for the coax into the shack. This
    needed a long masonry drill bit, which I had. It turned out to be far less difficult than I was expecting. DONE.The next stage, which will need help
    from my son, will be erecting the wire dipole. Both supports will need
    ladder work, which I can no longer do. If I attempt it I am likely to be
    giddy. This involves cutting the dipole wire to the correct length and
    running the coax into the shack.The final part will be attaching the BNC
    plug and testing the antenna.But, I do not have coax! I thought I had a
    reel, but will have to buy some. I guess I need about 5-6m, so 30m from
    Amazon should be fine.





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    Sunspots - Thursday April 29th 2021

    Posted: 28 Apr 2021 11:25 PM PDT http://g3xbm-qrp.blogspot.com/2021/04/sunspots-thursday-april-29th-2021.html


    Solar flux is 78 and the SSN 42. A=3 and K=2.

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