USB LSB AND CW

SWLing and TX Forum, for everything below 30MHz...

USB LSB AND CW

Postby rogers8472 » Sat Apr 05, 2014 8:19 pm

Hi all,, I have been into scanning now for about 2 years,,, I have recently upgraded from a uniden 3500 to an icom
Icr20 ,,, now thenthe icom has the ability to receive usb,, lsb,, cw,, however I have no idea what freqs to tune into to actually hear anything on these modulations???

Any advice would be gratefully received cheers
rogers8472
 
Posts: 5
Joined: Sat Apr 05, 2014 5:32 pm

Re: USB LSB AND CW

Postby m0lsx » Sat Apr 05, 2014 9:15 pm

LSB = Lower Side Band
USB = Upper Side Band
CW = Continuous Wave This is used to send Morse Code.

AM = Amplitude Modulation & has a carrier, plus two identical audio signals added, one Upper one Lower.
For Single Side Band (SSB) The carrier is removed & a upper or lower part of that audio is sent. Thus the signal is much much narrower & it also sounds slightly odd.
Normally the convention is that LSB is sent below 10 MHz & USB above..There are various alledged reasons for this, but it is how it is for everyone but the military normally use USB..I am told this is because it can travel slightly longer distances than LSB..But do not know if that is true or not.
The most common place to hear SSB is on HF & the easiest place to find it is the amateur bands.
Having found a SSB, signal you then need to tune it in, this can be done in a variety of ways, I will not go into the exacts, but very fine tuning is required to make the audio readable.
With CW..It is simply a AM carrier switched on & off. The simplest place to find CW now is on the Amateur bands. Most commercial & military operators, dropped CW some time ago, if you listen to a amateur radio repeater you will hear Morse tones sent over a FM (Frequency Modulation) carrier, the carrier it's self is not switched on & off, thus it is not CW.
Buy a database from Kimmy JS19 via http://ukscanningdirectory.co.uk/
Or do Google search of this forum via https://cse.google.com/cse/publicurl?cx=017721449704518888595:wswa65nq4ww
73 De Alan (M0LSX.)
http://www.qrz.com/db/M0LSX"
User avatar
m0lsx
 
Posts: 5667
Joined: Wed Nov 21, 2012 9:14 pm
Location: Norwich. TG21.

Re: USB LSB AND CW

Postby rogers8472 » Sun Apr 06, 2014 12:55 pm

Thanks for that mate,, I will have a play with it tonight and see what I can find
Managed to pick up some 10 meter band action in the 28 mhz range so I am getting there slowly
rogers8472
 
Posts: 5
Joined: Sat Apr 05, 2014 5:32 pm

Re: USB LSB AND CW

Postby m0lsx » Sun Apr 06, 2014 1:46 pm

The amateur band plans are at.....http://rsgb.org/main/operating/band-plans/display/


Tonight you will probably hear most activity on 40 meters (7 MHz)..20 meters (14 MHz) is more of a day band, due to the way propagation works. During the day, 20 meters is the band to listen to if you want DX, but night time it is very quiet.
80 meters (SSB is on 3.6 to 3.8 MHz) can be a good band for local UK traffic.
Buy a database from Kimmy JS19 via http://ukscanningdirectory.co.uk/
Or do Google search of this forum via https://cse.google.com/cse/publicurl?cx=017721449704518888595:wswa65nq4ww
73 De Alan (M0LSX.)
http://www.qrz.com/db/M0LSX"
User avatar
m0lsx
 
Posts: 5667
Joined: Wed Nov 21, 2012 9:14 pm
Location: Norwich. TG21.

Re: USB LSB AND CW

Postby rogers8472 » Sun Apr 06, 2014 8:46 pm

Thank you very much for your prompt reply,, think I am getting to grips with it now
I was also very surprised to hear British public radio stations low on the am band?? Didn't realize we still used it

Anyway thanks for that pal I will post a you tube video of any successes that I have and send you the link
Cheers
rogers8472
 
Posts: 5
Joined: Sat Apr 05, 2014 5:32 pm

Re: USB LSB AND CW

Postby m0lsx » Sun Apr 06, 2014 9:22 pm

There are still several stations on Long Wave. I often listen down below 500khz as I like to go down to Very & Ultra Low frequencies.
Buy a database from Kimmy JS19 via http://ukscanningdirectory.co.uk/
Or do Google search of this forum via https://cse.google.com/cse/publicurl?cx=017721449704518888595:wswa65nq4ww
73 De Alan (M0LSX.)
http://www.qrz.com/db/M0LSX"
User avatar
m0lsx
 
Posts: 5667
Joined: Wed Nov 21, 2012 9:14 pm
Location: Norwich. TG21.

Re: USB LSB AND CW

Postby rogers8472 » Sun Apr 06, 2014 10:10 pm

Well mate thanks for your advice I managed to get some stations on
20 mtrs,,, like you said audio was odd but understandable,, I had better results on am
Than usb/lsb,,, is this correct??
rogers8472
 
Posts: 5
Joined: Sat Apr 05, 2014 5:32 pm


Return to HF & Shortwave

Who is online

Users browsing this forum: No registered users and 1 guest