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)

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)

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)

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)

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)

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)

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)