270
SWAN 270 & 270B
The Swan 270 transceiver and later the
270B, featured the same size and power as
the 260, plus selectable sideband, a meter
for tuning and S-meter, a sharper CF
network, AGC, ALC, seperate AF and RF
gain controls, a 100kz crystal calibrator,
and a socket for an optional VOX unit.
This unit sold for $525.00 US in 1969. The
270B was introduced in 1970, and is the
same radio as the 270 except is only has the
built-in 117 vac supply. The 14A dc supply was optional. ($39.95) Selling price in 1970 is listed
at $499.00 US.
SWAN 270B CYGNET
270B SPECIFICATIONS
Frequency Ranges:
80 meters 3.5 to 4 mc
40 meters 7.0 to 7.3 mc
20 meters 14.0 to 14.350 mc
15 meters 21.0 to 21.450 mc
10 meters 28.0 to 29.7 mc
Power Input:
Single sideband, suppressed carrier; 260 watts PEP, minimum on all bands
CW, 180 watts dc input on all bands
AM, (single sideband with carrier) 65 watts dc input on all bands
Distortion:
Distortion products down approx. 30 db
Unwanted Sideband Suppression:
Unwanted sideband down more than 50 db
Selectivity:
Provided by 5500kc crystal lattice filter, 2700 cycles wide at 6db down, 4600 cycles wide at 60
db down. Shape factor of 1.7 with ultimate rejection greater than 100 db.
Receiver Sensitivity:
Less than 0.5 microvolt at 50 ohms impedance for signal-plus-noise to noise ratio of 10 db
Transmitter Output:
Wide range Pi network output matches resistive loads from 50 to 75 ohms
Metering:
Power amplifier cathode current 0-400 ma on transmit, S-Meter 0-70 db over S9 on receive
Front Panel Controls:
AF Gain, RF Gain, Sideband Selector, CAL-REC-TUNE/CW, Mic. Gain, Bandswitch, Carrier
Balance, PA Plate Tune, Driver Tune, PA Load, Dial Set, and Meter Switch
Rear Panel Controls and Connections:
Bias potentiometer, CW key jack, Jones plug power connector, Antenna jack, S-Meter zero,
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