hf usb lsb confussion
Submitted: Thursday, Apr 12, 2007 at 10:46
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dan-the-man
hello can anyone tell me what upperside band and lower s b is on my two way. can i reach people ,and vice versa if we are on different 'bands'. thanks
Reply By: Rocky_QLD - Thursday, Apr 12, 2007 at 10:53
Thursday, Apr 12, 2007 at 10:53
Dan
The short answer is both the transmitter and receiver must be on the same side band ie USB or LSB to communicate with each other.
Regards
Rocky
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Reply By: Robin - Thursday, Apr 12, 2007 at 10:54
Thursday, Apr 12, 2007 at 10:54
Thats a result of type of modulation used called Single side band and
its use has power efficentices.
You will not understand someone on LSB if you are on USB.
Depending on your radio - the energy of your transmitter will
be sent on a frequency a little bit different when you switch
between upper and lower sideband.
So you may not here anything.
Robin Miller
AnswerID:
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Follow Up By: dan-the-man - Thursday, Apr 12, 2007 at 11:30
Thursday, Apr 12, 2007 at 11:30
its a codan 8528. how do i know what 'side band' the common frequencies are on ie. vks737, radtel rfds etc or havnt i seen them in their publications ?
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Follow Up By: Robin - Thursday, Apr 12, 2007 at 11:39
Thursday, Apr 12, 2007 at 11:39
VKS737 use only USB
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Follow Up By: Stu050 - Thursday, Apr 12, 2007 at 18:41
Thursday, Apr 12, 2007 at 18:41
All HF frequencies in Australia, with the exception of 27Mhz CB and some marine frequencies are USB (amateur radio excluded here)
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Reply By: Red Frog - Vic - Thursday, Apr 12, 2007 at 13:10
Thursday, Apr 12, 2007 at 13:10
An AM signal is comprised of a carrier wave and two sidebands, upper and lower which carry the same information, so to narrow the bandwidth and increase efficiency one sideband and the carrier is stripped from the signal so we have either upper or lower sideband transmitted. The carrier has to be introduced again at the receiver to make the sideband intelligible
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Follow Up By: Rocky_QLD - Thursday, Apr 12, 2007 at 13:27
Thursday, Apr 12, 2007 at 13:27
That's probably one of the simplest and best descriptions of SSB ever.
Regards
Rocky
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Follow Up By: Red Frog - Vic - Thursday, Apr 12, 2007 at 13:33
Thursday, Apr 12, 2007 at 13:33
Back in 79 the tutor at my radio club had to explain things very simply to me otherwise it didn't get through, I passed first time so he did a good job :)
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