|[AMRadio] WRL Globe king FS on QTH|
ranickel at comcast.net
Sun Dec 15 15:12:19 EST 2013
On 12/15/2013 1:22 PM, Jim Tonne wrote:
> Single sideband with carrier is pure single sideband (with carrier).
Corrrect, vestigal sideband is different. In radio, a single
sideband with full or partial carrier is usually called AME or AM
Equivalent mode. It was officially used in marine HF radio for some
time during the transition from full-carrier AM to SSB to maintain a
level of compatibility with older AM receivers that lacked a BFO or
product detector. Because a phase insensitive (envelope) detector is
used, distortion is higher, or in amateur terminology, "sounds like
crap". Some ham gear manufacturers included it but any SSB rig can
generate AME by just unbalancing the balanced modulator. Early
transceivers like the Swans explained how to do so to support AM
operation but since there was no separate AM detector, you had to
zero-beat the carrier on receive.
Marine SSB radios often provided an AM detector and choice of two levels
of carrier, and many military radios also provided AME to allow
reception by AM receivers. The term "Compatible SSB" is also used.
73, Bob W9RAN
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