KE7TRP Photos

		The latest addition to the KE7TRP transmitter lineup: Driven by a frequency-synthesized SSB/CW transceiver, it runs a pair of 4-400A's modulated by a pair of 304TL's for full, legal output on the 40-, 80- and 160-meter bands. The RF deck uses vacuum relays for bandswitching. The modulator uses the "iron" (mod. xfrmr, mod. reactor, capacitors) salvaged from a Collins 20V3 AM broadcast transmitter. Audio chain is an Ultra gain pro, 166XL DX, 32 band EQ and DAP310 audio processor. Both final amplifier and modulator have individual power supplies: 3500 vdc @ 1 amp for the 4-400A's and 3000 vdc @ 1 amp for the modulator 304TL's, and both are self-contained in individual racks. This project was assisted greatly by Robert Smith, W0VMC. Click here for more pictures of this rig.

		Station 1: Globe King 500C restored and upgraded (details here); Hallicrafters SX110 and SX-100 receivers; Matching R48 speaker; 802 mixing console and dbx 166XL audio processor; MXL, large-diaphram condenser microphone and 'pop' screen. (Click here for larger photo ~150K)

		Perspective view of the audio processor, mixer, microphone and two Hallicrafters receivers. (Click here for larger photo ~150K)

	Click here for restoration details and photographs of the WRL Globe King 500C transmitter

		Station 2: (160 or 40 meters AM) Hallicrafters SX100 or SX110 (former pictured) Yaesu Yo100 Scope; Freq counter; One of three transmitters: Johnson Valiant, Johnson Ranger or Globe Champion 300 (the latter pictured here); D104 or EV638 mic. (Click here for larger photo ~120K)

		It is believed that this transmitter was built at Motorola and then used by the Motorola ham club. It follows some guidelines of the Johnson Desk KW and the ARRL KW transmitter. It is very well built and came with LOTS of documentation. After a Massive cleaning effort, the modulation transformer was found to be shorted. W8QBG has been helping to restore this unit. Description: 6.5 ft tall and 3 ft wide. This transmitter tops 500 lbs. Bottom deck is the PA HV power supply complete with hour meter at 756 hours. Next up is the modulation deck housing two 810 triodes with a separate 2600-volt power supply. Mid bay are the screen and LV supplies, metering control and the variacs for the Screen and HV. The top deck contains the RF chassis with two 4-400s in forced air cooled config. The unit uses a B&W 805 bandswitched tank. This unit requires external excitation in the form of RF and Audio. A Johnson Ranger is used for this purpose.
Click here for a larger photo of the 'Motorola' kilowatt transmitter.

		Click here for photos of the 'Motorola' transmitter being restored.

		The latest equipment additions are a T-368 transmitter and a Hammarlund SP-600 receiver (and cat warmer) from the estate of WD7I. A recent problem with hum in the low-level audio stages of the T-3 has been satisfactorily addressed and this combination is now on the air to good signal and audio reports. The T-368 runs a single 4-400 final modulated by a pair of 4-125A's for a legal-limit output power of 375 watts. (Click here for larger photo ~150K)