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Swan SW-240 Three Band HF Transceiver 20/40/80 with the matching SW-117 AC Power Supply

$269.99

Swan SW-240 Three Band HF Transceiver 20/40/80 with the matching SW-117 AC Power Supply

$269.99
Shipping:
$70.00 (Fixed shipping cost)
For International Shipping, Please contact me for a Quote before check out
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Product Description

This Swan SW-240 Three Band HF Transceiver 20/40/80 with the matching SW-117 AC Power Supply, is in very good condition.

The front panel and cabinet are in nice shape. The power supply cabinet has a few marks on the cabinet top.

I tested this rig on my bench on 80 meters and it loaded up fine with excellent output.

 I also checked the transmit audio and it was very good.

When I checked the receiver, there was no sound.

I found the speaker connection in the power supply was disconnected in the power supply and the signal was coming from the radio.

 I had another supply from another radio and the SW-240 works fine with that power supply so I know the receive is good. The power supply will need some attention by hooking back up the speaker line.

I am selling this radio and power supply, as is, as described for the family of a silent key.

 

Read all About it!

240 (Tri-Band)
The SW-240 was Swan’s first multi-band and only tri-band SSB transceiver, covering the 20, 40, and 75-meter
bands. This transceiver contains no S-meter function. The 240 replaced the early mono-band models (120, 140,
etc.) and was built from November 1962 through February 1964, when it was subsequently replaced by the 400
model 5-band transceiver. An external power supply is required. As with the early mono-band models, the
power amplifier uses a single, horizontally mounted 6DQ5 PA tube and the SSB dc input PEP is specified as either
240 or 180 W, depending on the power supply’s PA plate voltage level (800 or 600 V respectively).
Two accessories were offered for this unit, the matching 117AC power supply and the TCU (external VFO),
both of which matched the light gray color scheme of the 240’s front panel.
Reduced Tune-Up Power. This model, like many of the other single-tube PA designs, limits input power when
in the TUNE mode. The 240 switches a resistor in series with the PA tube screen grid to decrease power and
protect that tube during tune-up (most other later single-tube PA models switch in a cathode resistor to accomplish
the same objective). Since this dc input power limiting resistor is not used during normal (CW or SSB)
operations, the actual operational input and output powers will be greater than that achieved during tune-up.
However, the amount of PA screen voltage decrease during tune-up is dependent on the model version. For a
specific exemplar of the earliest version, this resistor reduced the screen voltage from ~206 V to ~184 V – in that
version a 6-kΩ resistor is switched in series with the screen during tune-up and the manual specifies tuning-up
loading to a ~275-mA cathode current dip when in the TUNE mode. For a later version production unit, the
screen voltage dropped from ~201 V to ~114 V – its manual specifies tune-up loading to only ~160 mA in the
dip. That version switches in a 6-kΩ and 10-kΩ resistive voltage dividing network (with the 6 kΩ in series with
the screen grid and the 10 kΩ resistor connected to ground) when the mode switch is in the TUNE position,
causing a ~60% decrease in screen voltage (the measured drop was 57%, in very close agreement to the expected

value). For the later version (160 mA in the dip), expect to see about 60 or 65 W RF output in the TUNE mode.

For any of the versions, expect to achieve a SSB PEP output in the 100 to 120 W range for a rig in average condition.

Standby/Filter Switch Operation. The Swan 240 (and the 400) uses two inter-connected switches to control
power distribution – the FILAMENT on-off switch and the SUPPLY OFF switch on the mode control. The
manual incorrectly states and the front panel switch labeling suggests that only filament voltages are present
when the filament toggle switch is up (FIL ON) and the mode switch in the SUPPLY OFF position. This is incorrect.
All power supply voltages are present within the transceiver. The Swan 240 (and 400) employed the
SUPPLY OFF function switch only to cut-off the 275 V at the switch when in the OFF position. This switching
arrangement was deemed helpful in keeping the filaments warm for quick operation and especially for
having a fully warmed up VFO. Since the MV is unloaded when in SUPPLY OFF mode, its level will increase
to ~325 V. This dual switch system was discarded with the introduction of the Swan 350.

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