|[AMRadio] WRL Globe king FS on QTH|
Tonne at Comcast.Net
Sun Dec 15 14:22:20 EST 2013
Vestigial sideband has *both* sidebands up to some modulating rate
above which it smoothly changes to single sideband as one of the
sidebands is lopped off, typically by a bandpass filter.
Single sideband with carrier is pure single sideband (with carrier).
*If* the carrier is placed inside the passband of the bandwidth-determining
filter *then* it can be vestigial sideband. But I know of no
broadcast AM equipment that does this. GE, in their entry into Quad FM
had the upper subchannel operate in the VSB mode.
On 12/15/2013 1:12 PM, K5MYJ wrote:
> In TV that is called vestigial SB. It's a cheap way to make a SSB rig
> do AM. All you have to is unbalance the balanced modulator.
> Bob Macklin
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