Hi,

CQ magazine, May '65 page 75, gave a simple method
of transmitting a.m. with a KWM-2.
They said if you unbalance the pot
in the KWM-2 "carrier balance" circuit
(on the right front side, on top of the chassis),
but leave the trimmer capacitor alone, you can get about
90mA of plate current due to the carrier, about 15W out
with the rig in SSB position.
Keep the mic level down so the plate current barely flickers on peaks,
and you will be transmitting a.m. with one sideband.
Return the pot to its original position for SSB use.
Chuck Scheuers said he tried it and that it works.

QST had a better method, reinserting carrier
after the mechanical filter, by adding it to the PTO output
using a variable pot for carrier level control
in place of the headphone jack on the front of the KWM-2.
See June '63 QST page 48. (A correction appeared,
that turret connection E40A should read E20A).
The relay connection information in the article applies to the older,
non-plug-in relays (Winged emblem KWM-2).
Relay K4 shorts out the carrier injection during receive.
With this method, you should run 120mA carrier plate current,
and will get about 25W carrier out.

73,
Ed Knobloch

Edward Knobloch wrote:
Hi,

CQ magazine, May '65 page 75, gave a simple method
of transmitting a.m. with a KWM-2.

And Swan 350's had the carrier balance (null) pot right on the front
panel, and they claimed that allowed you 125W dc input AM on all bands.

Unfortunately, the carrier is injected before the SSB filter, and since the
filter's rejection skirt is positioned well over the top of the carrier(better
SSB carrier rejection, you see), you lose most of your carrier power before
you even start.

There was a certain amount of interest in running early SSB rigs in AM
mode, but fortunately that faded rapidly.

-Chuck