Swan 350 User Manual

THE SWAN 350
The Swan 350, no doubt one of Swan's most
popular series of transceivers, evolved over
the years to the 350C, then into the 350B and
350D, the last of the line. Pictured is my first
Swan rig, a 1967 model 350.

With a suitable power supply, operation may be fixed, portable, or mobile. Power input on all
bands exeeds 400 watts PEP on single sideband, and 230 watts dc input on CW. The basic 5 band
transceiver includes AGC, ALC, and grid block CW keying.

SPECIFICATIONS....

(Model 350)
FREQUENCY RANGES:

80 meters 3.5 to 4.0 mc LSB
40 meters 7.0 to 7.5 mc LSB
20 meters 13.85 to 14.350 mc USB
15 meters 21.0 to 21.5 mc USB
10 meters 28.5 to 29.0 mc USB

POWER INPUT:

Single Sideband, Suppressed Carrier is 400 watts PEP minimum on all bands.
CW, 320 watts, dc input on all bands.
AM, Single Sideband with Carrier, 125 watts dc input on all bands.

DISTORTION:

Distortion products down at least 30 db.

UNWANTED SIDEBAND SUPPRESSION:

Unwanted sideband down at least 40 db.

CARRIER SUPPRESION:

Carrier suppression at least 50 db.

RECEIVER SENSITIVITY:

Less than 0.5 microvolt at 50 ohms impedance for signal-plus-noise ratio of 10 db.

AUDIO OUTPUT AND RESPONSE:

Audio output is approx. 3 watts to a 3.2 ohm load. Response essentially flat 300 to 3000 cps in
both receive and transmit.

TRANSMITTER OUTPUT:

Wide range Pi-network output matches antennas essencially resistive at 20 to 300 ohms
impedance, with coarse and fine load adjustment.

METERING:

Power amplifier cathode current 0-800 ma on transmit, S-meter 0-70 db over S9 on receive.

FRONT PANEL CONTROLS:

Rec-Tune-CW, AF Gain, RF Gain, Mic. Gain, Bandswitch, Carrier Balance, PA Plate Tune, PA
Grid Tune, PA Load Coarse, PA Load Fine, VOX-PTT Switch.

REAR PANEL CONTROLS:

Bias potentiometer, Grid-Block CW Key Jack, Jones plug power connector, Vox connector,
Antenna (SO239), S-Meter Zero, SPDT relay terminal strip.

VACUUM TUBE COMPLEMENT:

V1 6EW6 VFO Amplifier