Subj : Re: CB experiments
To   : Ginger1
From : Weatherman
Date : Sat Feb 08 2025 02:36:00

-=> Ginger1 wrote to Bob Worm <=-

 > SSB is actually legal in the UK now, license free (on purpose built radios
 > and to 12W PEP). I guess compliance to both is minimal but I doubt many
 > people get their collars felt unless they take the mick...

 Gi> Forgive my ignorance - what's SSB? Very new to this game.
 
 SSB = Single Side Band.  An AM signal has three components.  The carrier
signal and two side bands, upper and lower.  In the 1930s or so, techniques
were found to allow modulation on only the side band portion of the signal. 
This essentially allows more effective power to be concentrated on a narrow
portion of the AM carrier.  It allows a 4 watt signal to provide the modulation
effect of a 12 watt AM.  Power is also measured differently.  Instead of
average power you measure peak envelope power.

 Gi> And sorry, what's SWR? You mentioned a SWR Meter. Something to seek out
 Gi> areas with better radio signal for the desired frequencies?

SWR = Standing Wave Ratio.  Compares the signal output to the RF returning
along the coax.  A tuned antenna system will have a low SWR, meaning more
signal is transmitted compared to what is returning through the coax.  SWR of
1.5:1 are good, 1.0:1 is perfect.  SWR of 3:1 or below is acceptable.  Above
that you lose so much efficiency that your signal is severely degraded and
extremely high SWR of 5:1 or above could damage your radio.


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