In article . com,
"Ken Wilson" wrote:

With PBT, the ability to attenuate the unwanted sideband is limited by the
skirt selectivity characteristics of the filter.

With selectable sideband sync detectors, the unwanted sideband is cancelled
by the circuitry. This can be significant if the detector is well tuned.

The two are not the same.

OK Thanks for the Info.

When the unwanted sideband is cancelled by the circuitry how do you get
the 6khz bandwidth instead of 3khz.Or maybe you don't ????

I am talking/asking about the Drake R8A vs R8B receivers only... with
the bandwidth set to 6khz & AM SYNC mode.

Learning all the time.

In AM mode, listening to an AM station and with the PBT control at 12
o'clock using the 6KHz filter you have 3 KHz of the lower and 3KHz of
the upper side bands. Rotate the PBT control to 3 o'clock and you have 6
KHz of the upper side band and none of the lower side band. You get the
reverse situation when you turn the PBT to 9 o'clock.

The high modulated frequencies are farther from the carrier so you will
hear an improvement in the audio high end when the PBT control is turned
either way from the 12 o'clock position.

--
Telamon
Ventura, California