SPECIFICATIONS....
FREQUENCY RANGES:
20m USB 13.990 mc to 14.380
mc
40m LSB 6.900 mc to 7.340 mc
75m LSB 3.640 mc to 4.030 mc
THE SWAN SW-240
The Swan SW-240 is one of my
favorite rigs, with 3 bands including
75m, 40m, and 20m, it packages the
three monobanders into one unit.
Furnished with the mobile mounting
bracket, it makes for an easy to use
base / portable / mobile radio.
POWER INPUT:
Single Sideband 240 watts PEP
with 800 VDC power supply
CW 200 watts DC input
AM (single sideband with
carrier) approx. 60 watts input
METHOD OF GENERATING
SSB:
High frequency crystal filter
centering at 5174.5 kc. Single
conversion employed in both
transmit and receive. Bandwidth is 3 kc nominal at 6 db down, both transmit and receive.
UNWANTED SIDEBAND SUPPRESSION:
Approximately 40 db.
CARRIER SUPPRESSION:
Approximately 50 db.
TRANSMITTER OUTPUT IMPEDANCE:
Pi-network output matches antennas essencially resistive at 20 to 300 ohms impedance.
RECEIVER SENSITIVITY:
Less than 1 microvolt at 50 ohms input impedance for a signal-plus-noise to noise ratio of 10 db.
AUDIO RESPONSE:
Essencially flat 300 to 3000 cps on both transmit and receive.
RECEIVER OUTPUT:
3 watts audio at 3.2 ohms.
FRONT PANEL CONTROLS:
Main Tuning, RF Gain, AF Gain, Mic. Gain, Carrier Balance, Exciter Tune, PA Tune, PA Load,
Function Switch, VFO Bandswitch, Main Bandswitch, Filiment ON - OFF.
METERING:
PA Cathode current, 0 - 400 ma.
DIMENSIONS AND WEIGHT:
13.25" wide x 5.6" high x 11" deep. Weight is 11 lbs.
TUBE COMPLIMENT:
V1 6DQ5 PA
V2 12BY7 Driver
V3 6BE6 Transmitter Mixer
V4 6AU6 VFO
V5 6BA6 Receiver RF Amp
V6 12BE6 Receiver Mixer
V7 6CB6 1st IF Amplifier
V8 6BA6 2nd IF Amplifier
V9 7360 Balanced Modulator
V10 6V6GTA AF Output
V11 12AU7A Microphone Amplifier
V12 12AX7 Product Detector and 1st AF Amplifier
V13 6U8A Carrier Oscillator
V14 6AL5 AGC Rectifier
V15 0D3 Voltage Regulator
POWER SUPPLY REQUIRMENTS:
Filiments: 12.6 volts at 3.45 amps, ac or dc.
Relay: 12 volts dc.
Bias: -100 volts dc at 5 ma.
Medium Voltage: +275 volts dc at 110 ma.
High Voltage: =600 to 800 volts dc at 300 ma., transmit only.
Swan SW-12DC and Swan SW-117AC power supplies are recommended for mobile and fixed
station use respectively.
EXTERNAL TERMINALS:
SPDT relay terminals on the rear panel for auxilary switching of a linear amplifier.
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