Specifications

PO Box 3526, Bellevue, WA. 98009 13737 SE 26
th
St. Bellevue, WA. 98005
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© 2003 SGC Inc. 36
as well as an oilcan dummy load. The result is that RF will “leak”
out; we have heard a few stories of amateurs who were heard
around town while operating their transmitters into a light-bulb
dummy load. If you use this system, make sure that you test the
equipment on a clear, harmless frequency (NEVER test with the
transmitter set on an emergency frequency, such as 2182 KHz).
SGC recommends that you build the light-bulb dummy load with
the following parts although we have made one with an old light
fixture and a makeshift version with just alligator clip leads and a
light bulb):
• AC socket to cable with a PL-259 connector (for
transceiver)
• AC socket to cable with alligator clips (needed with
coupler)
• Light bulb to AC adapter
• 75 to 125 watt light bulb, 120 to 220 VAC
• 100 watt radio transceiver
• Any SGC Smartuner or equivalent
ATTENTION: Some retuning may take place as the impedance of the light bulb
varies with the power level. If the power level is held constant with a continuous
carrier such as produced by CW mode operation, the coupler setting will settle after
a short period of time.