• [SSDN] So Where DID the LSB/USB Convention Come From?

    From SSDN via rec.radio.amateur.moderate@21:1/5 to All on Mon Sep 13 18:47:28 2021
    XPost: rec.radio.amateur.moderated, uk.radio.amateur, free.uk.amateur-radio

    SolderSmoke Daily News

    ///////////////////////////////////////////
    So Where DID the LSB/USB Convention Come From?

    Posted: 13 Sep 2021 12:39 PM PDT http://soldersmoke.blogspot.com/2021/09/so-where-did-lsbusb-convention-come-from.html

    -- Bottom line:   I still don't know why ham radio adopted as a convention LSB below 10 MHz and USB above 10 MHz.  There are several theories. but so
    far there is no convincing explanation in favor of any one of them. And
    almost all of the people involved are probably Silent Keys by now; this
    makes it more difficult to gather first-hand information. -- I'm not even
    sure when the convention began

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From gareth evans@21:1/5 to SSDN via rec.radio.amateur.moderate on Tue Sep 14 11:33:29 2021
    XPost: free.uk.amateur-radio, uk.radio.amateur

    On 13/09/2021 23:47, SSDN via rec.radio.amateur.moderated Admin wrote:

    SolderSmoke Daily News

    ///////////////////////////////////////////
    So Where DID the LSB/USB Convention Come From?

    Posted: 13 Sep 2021 12:39 PM PDT http://soldersmoke.blogspot.com/2021/09/so-where-did-lsbusb-convention-come-from.html


    -- Bottom line: I still don't know why ham radio adopted as a
    convention LSB below 10 MHz and USB above 10 MHz. There are several theories. but so far there is no convincing explanation in favor of any
    one of them. And almost all of the people involved are probably Silent
    Keys by now; this makes it more difficult to gather first-hand
    information. -- I'm not even sure when the convention began


    It is because of early SSB designs based on a 5MHz VFO with a 9MHz IF
    to give operation on 20m and 80m, with the sideband inversions that
    happens with that arrangement.

    Sorry, just done a quick thumbnail sketch and I think that's bollocks
    because to get the inversion, the VFO has to be above the IF.

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From brian@21:1/5 to rec-radio-amateur-moderated-request on Thu Sep 16 11:54:06 2021
    XPost: uk.radio.amateur

    In message <000000000000563ac705cbe83f4a@google.com>, SSDN via rec.radio.amateur.moderated Admin <rec-radio-amateur-moderated-request@panix.com> writes

    SolderSmoke Daily News

    ///////////////////////////////////////////
    So Where DID the LSB/USB Convention Come From?

    Posted: 13 Sep 2021 12:39 PM PDT >http://soldersmoke.blogspot.com/2021/09/so-where-did-lsbusb-convention-c >ome-from.html

    -- Bottom line:   I still don't know why ham radio adopted as a
    convention LSB below 10 MHz and USB above 10 MHz.  There are several >theories. but so far there is no convincing explanation in favor of
    any one of them. And almost all of the people involved are probably
    Silent Keys by now; this makes it more difficult to gather first-hand >information. -- I'm not even sure when the convention began


    A little known fact is that on Moonbounce, a USB SSB signal is returned
    as LSB and vice-versa due to Faraday Rotation. Circular polarisation
    gets round this.

    Brian G9FB
    --
    Brian Howie

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Ian Jackson@21:1/5 to nospam@b-howie.co.uk on Thu Sep 16 15:50:54 2021
    XPost: uk.radio.amateur

    In message <fgW3f5OOJyQhFw$2@b-howie.co.uk>, brian
    <nospam@b-howie.co.uk> writes
    In message <000000000000563ac705cbe83f4a@google.com>, SSDN via >rec.radio.amateur.moderated Admin ><rec-radio-amateur-moderated-request@panix.com> writes

    SolderSmoke Daily News

    ///////////////////////////////////////////
    So Where DID the LSB/USB Convention Come From?

    Posted: 13 Sep 2021 12:39 PM PDT >>http://soldersmoke.blogspot.com/2021/09/so-where-did-lsbusb-convention-c >>ome-from.html

    -- Bottom line:   I still don't know why ham radio adopted as a
    convention LSB below 10 MHz and USB above 10 MHz.  There are several >>theories. but so far there is no convincing explanation in favor of
    any one of them. And almost all of the people involved are probably
    Silent Keys by now; this makes it more difficult to gather first-hand >>information. -- I'm not even sure when the convention began


    A little known fact is that on Moonbounce, a USB SSB signal is returned
    as LSB and vice-versa due to Faraday Rotation. Circular polarisation
    gets round this.

    Brian G9FB

    Indeed - very little known. "Not many people know that."
    --
    Ian

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Jeff@21:1/5 to All on Thu Sep 16 17:47:11 2021
    XPost: uk.radio.amateur


    A little known fact is that on Moonbounce, a USB SSB signal is returned
    as LSB and vice-versa due to Faraday Rotation.  Circular polarisation
    gets round this.

    Brian G9FB

    Shirley that is an effect on the polarization of the signal, it would
    not change usb to lsb, that would require a mixing process!!

    Jeff

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Ian Jackson@21:1/5 to Jeff on Thu Sep 16 19:16:37 2021
    XPost: uk.radio.amateur

    In message <shvsef$1b4q$1@gioia.aioe.org>, Jeff <jeff@ukra.com> writes

    A little known fact is that on Moonbounce, a USB SSB signal is
    returned as LSB and vice-versa due to Faraday Rotation.  Circular >>polarisation gets round this.
    Brian G9FB

    Shirley that is an effect on the polarization of the signal, it would
    not change usb to lsb, that would require a mixing process!!

    Don't worry - the information is as genuine as the callsign.
    --
    Ian

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Brian Morrison@21:1/5 to Jeff on Thu Sep 16 18:30:22 2021
    XPost: uk.radio.amateur

    On Thu, 16 Sep 2021 17:47:11 +0100, Jeff wrote:


    A little known fact is that on Moonbounce, a USB SSB signal is returned
    as LSB and vice-versa due to Faraday Rotation.  Circular polarisation
    gets round this.

    Brian G9FB

    Shirley that is an effect on the polarization of the signal, it would
    not change usb to lsb, that would require a mixing process!!

    And a splash of moondust ;-)

    --

    Brian

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)