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USB Or LSB: Which, When ?

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Robert11

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Feb 3, 2008, 1:57:43 PM2/3/08
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Hello:

Is there some "general" rule regarding what is USB and what is LSB ?

e.g.

Are all MIL... ?

Or by frequency...?

Or,... ?

Thanks,
Bob


Geoffrey S. Mendelson

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Feb 3, 2008, 2:29:02 PM2/3/08
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Robert11 wrote:

> Is there some "general" rule regarding what is USB and what is LSB ?

Yes, all communications except HAM RADIO ones are USB. Note that this
is a "general rule" as you asked for, and there may be exceptions.

For HAM RADIO, the practice is USB above 10mHz, and LSB below,
but it is not a rule, and the U.S. 60 meter band (5mHz) is required
AFAIK to be USB.

The ham radio practice came about because of a particular military
surplus radio that when added to a carrier generator produced
USB over 10 mHz and when subtracted LSB below it.

This was never made a legal requirement, and by 1980 most ham radios
had both USB and LSB on all bands. It is legal to modify a commercial
radio for ham use, and therefore sometimes you hear people using USB
only commerical radios on the ham bands.

Millitary communications are often USB even up into the VHF/UHF range.

Geoff.

--
Geoffrey S. Mendelson, Jerusalem, Israel g...@mendelson.com N3OWJ/4X1GM
IL Voice: (07)-7424-1667 U.S. Voice: 1-215-821-1838
Visit my 'blog at http://geoffstechno.livejournal.com/

The Shadow

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Feb 3, 2008, 2:35:03 PM2/3/08
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"Robert11" <rgs...@notme.com> wrote in message
news:5oSdnYhr7pY1kzva...@comcast.com...
From Wikipedia

GENERAL RULE (MAY VARY)
a.. SSB: Single sideband(USB/LSB): This is used for long-range
communications by ships and aircraft, for voice transmissions by amateur
radio operators, and for broadcasting. LSB is GENERALLY used below 9 MHz
and USB above 9 MHz.

Example - Amateur radio operators can operate either LSB or USB on any Ham
band except the
60 Meters (5.3 MHz) which is USB only.

But most Hams follow the convention of LSB below 9 MHz and USB above 9 MHz
(except 60 meters)

Most of the shortwave broadcast stations seem to be USB

Lamont


Lamont

RHF

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Feb 3, 2008, 2:55:03 PM2/3/08
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On Feb 3, 10:57 am, "Robert11" <rgs...@notme.com> wrote:
- Hello:
-
- Is there some "general" rule regarding what is USB and what is LSB ?
-
- e.g.
-
- Are all MIL... ?
-
- Or by frequency...?
-
- Or,... ?
-
- Thanks,
- Bob

Bob - Good Questions :o) ~ RHF

ABOUT - Single Side Band
http://en.wikipedia.org/wiki/Single_Side_Band
-Claims- In Amateur Radio, LSB is traditionally used
below 10 MHz and USB is used above 10 MHz.

However Read - LSB/USB Chaos on the Bands...
-by- Peter (VK3KCG) on August 1, 2003
http://www.eham.net/articles/5913

FWIW - It has alway been my understanding :
* Generally "LSB" {Lower-Side-Band} is used by Amateur {Ham}
Radio Operators BELOW 7 MHz. {7,000 kHz}
* Generally "USB" {Upper-Side-Band} is used by Amateur {Ham}
Radio Operators ABOVE 7 MHz. {7,000 kHz}

US Navy AFN Shortwave Radio uses "USB" {Upper-Side-Band}
* Current AFN / AFRTS Shortwave Radio High Frequencies
AFN-SW - http://myafn.dodmedia.osd.mil/ShortWave.aspx

WWV and WWVH use a 'modified' Double Side-Band {DSB}
http://en.wikipedia.org/wiki/WWV_%28radio_station%29
with Suppressed Carrier (DSB-SC) for their Time Signal
Transmissions on 2.5 MHz, 5 MHz, 10 MHz, 15 MHz
and 20 MHz. WWV => http://tf.nist.gov/stations/wwv.html

Many/Most Commercial High Frequency (HF) Broadcasts
use "USB" {Upper-Side-Band}
http://radionut53.tripod.com/id213.html

CB {Citizens Band} Radio uses both LSB and USB.
http://en.wikipedia.org/wiki/Citizens'_band_radio
http://www.tech-faq.com/cb-citizens-band-radio.shtml
.
-ps- Telamon be sure to Count* this as another one
of my 'Clueless Posts' -cause- IT IS ! ;-{
Plus Extra Credit for the : Cut, Copy and Paste Stuff. :o)
* Rec.Radio.Shortwave Newsgroup Readers :
Please I Need Your Votes ! -and- I Want Your Votes !
In this Weeks Race for the RRS "Clueless Troll" Award.
.

The Shadow

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Feb 3, 2008, 3:02:40 PM2/3/08
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"The Shadow" <Cran...@CobaltClub.com> wrote in message
news:RHopj.45566$Gr4....@newsfe08.phx...

For a list of stations using sideband -- see
Top 1000 HF Frequencies
Compiled by Larry Van Horn fURL:

http://www.grove-ent.com/mttopHF.html

Very few LSB stations listed

Lamont

Lamont

dxAce

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Feb 3, 2008, 3:16:27 PM2/3/08
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The Shadow wrote:

Nah, most of the shortwave broadcast stations use AM.

dxAce
Michigan
USA

Geoffrey S. Mendelson

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Feb 3, 2008, 3:39:03 PM2/3/08
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dxAce wrote:
> Nah, most of the shortwave broadcast stations use AM.

There have been shortwave broadcasts in SSB over the years. They are
very attractive to broadcasters as they use far less power than AM.
They never really caught on because their target audience did not have
SSB capable receivers.

Note that the U.S. Armed Forces Radio Network transmissions are not
broadcasts, because they are not intended for the general public.

The Shadow

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Feb 3, 2008, 4:56:21 PM2/3/08
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"dxAce" <dx...@milestones.com> wrote in message
news:47A6211A...@milestones.com...

Oopps slip o da keyboard, obviously meant if a shortwave broadcast station
uses SSB, most seem to be USB

Lamont

Graham.

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Feb 3, 2008, 5:24:02 PM2/3/08
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> The ham radio practice came about because of a particular military
> surplus radio that when added to a carrier generator produced
> USB over 10 mHz and when subtracted LSB below it.

Non of my receivers will tune down to 10 MilliHertz, is that FLF?

.
--
Graham

%Profound_observation%


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