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SECTION ONE


Globe Master


IF YOU DARE DREAM IT, BUILD IT!”


ONE KILOWATT AM TRANSMITTER


GENERAL DESCRIPTION


The Globe Master is a high level plate modulated AM transmitter easily capable of producing one-hundred percent modulation at the full legal power limit on 20/40/80 & 160 meter amateur bands with only 10 to 15 watts of drive provided from an external exciter.


The builder’s desire from concept to finish was to replicate the 1950’s era look and feel of an amateur radio transmitter which would command the airwaves with the push of a button, yet be easy and pleasurable to operate. Attention to necessary and desirable features without excessive clutter was a priority.


Built into a handsomely styled double-stacked 60 inch tall rack are the following component racks from top to bottom:









A prerequisite for construction was that all controls be clearly marked for easy identification and placed in a well thought out fashion so as to provide the least amount of distraction to the operator.


Another important requirement was that the 304TL and 4-1000A power vacuum tubes be in full view from the front panel for the enjoyment of operating personnel and visitors alike.


To reduce wiring clutter, all cables are rear-connected and/or accessed from the rear doors.


Additionally, the RF portion of the transmitter may be used as a high quality stand-alone SSB Linear Amplifier by merely placing the 4-1000A screen selector mode switch (located on the RF deck) from AM to SSB and changing the modulation transformer output control switch from PHONE to CW position. The modulator power may be left “OFF” for SSB operation. More information is provided in the “Operating the Globe Master on SSB / Low Level AM” section.


The modulator layout was carefully designed to produce a very clean on the air hi-fi signal.



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