KB7OCY Photos

Current KB7OCY Operating Position	The Gates BC-250GY operating position at KB7OCY. Click on link below for more information: Click here for a detailed description of this transmitter and modifications made to operate on 80 and 40 meters. ~1.2 Meg
Previous KB7OCY Operating Position	The operating position used with the GLOBE MASTER AM transmitter . It runs a 4-1000A final modulated by a pair of 304TL's (described below) for an easy full-legal-limit power outputwith less than 10 watts of drive. CLICKING HERE or on the image at left brings up a larger version of the photo (1200 x 850 px, 350 kB).
Globe Master Transmitter Technical Manual	The detailed circuit description and parts layout of the Globe Master transmitter have been compiled into a Technical Manual by KB7OCY. This manual was the basis for the two-part article in the Jan. and Feb. 2014 issues of Electric Radio magazine. The link below goes to an HTML, web-page version of that manual. CAUTION: This is a large document, approximately 7.6 MEGABYTES in extent, and will take time to load.. CLICKING HERE or on the image at left goes to the Globe Master Technical Manual web page (7.6 Megabytes) Clicking here will download a complete 4 Megabyte PDF to your browser for off-line viewing
Even Earlier Operating Position	Earlier on-the-air rigs at KB7OCY: At right is an RCA BTA-250L ex-broadcast transmitter running 250 watts AM on 160 meters. It is paired with the Hammarlund SP-600jx receiver in the top of the middle rack. Immediately below is a National Radio NCL-2000 vintage linear amplifier that is used with an Icom 706 and Dentron antenna tuner for SSB operations on the higher bands. The audio chain occupies the leftmost rack and consists of a Behringer microphone preamp driving a Yamaha compressor/limiter which then feeds line-level audio to the Harris console and on to the RCA transmitter. Views of the inside of the RCA transmitter and its schematic diagram CAN BE FOUND HERE. A video guided tour of the RCA transmitter and rack equipment CAN BE FOUND HERE (YouTube). CLICKING HERE or on the image at left brings up a larger version of the photo (1200 x 850 px, 850 kB).
Globe Master 304TL Modulator Power Test	Full-power testing was the latest step taken in the development of the 304TL Modulator Deck. The results were quite satisfactory. CLICKING HERE or on the image at left brings up a larger version of this photo (1200 x 670 px, 664 kB). CLICKING HERE ______ takes you to an index page for all the modulator-test images and additional comments by KB7OCY. CLICKING HERE takes you to a YouTube video of a test with the modulator driving an 833-based Tesla coil that gives rather fiery results.
Globe Master Modulator Schematic Diagram	CLICKING HERE ______ takes you the detailed modulator schematic pages. This will open a PDF file of approximately 4.7 Megabytes showing the very neat, hand-drawn schematics and wiring diagrams of the entire modulator.
Globe Master Modulator Driver Test	The modulator speech-amp and driver stages were first tested separately into a local speaker for fidelity and power output with good results. CLICKING HERE takes you to additional photos of the set-up . CLICKING HERE takes you to a YouTube video of the actual test.
Globe Master 304TL Modulator Project	Re-engineering this modulator deck was the first project undertaken in restoring a multi-band, multi-rack set of vintage AM transmitters originally owned and operated by W7GNP in Phoenix. The units were in a very sad state and did not look like this finished one at all. However, transformer iron is quite rugged and progress has been forthcoming. -air rigs CLICKING HERE or on the image at left brings up a larger version of this photo (1034 x 773 px, 614 kB). CLICKING HERE ______ takes you to an index page for all the modulator and power-supply progress images
Globe Master 304TL Modulator Project	Rear view of the modulator deck in almost-finished form. The large transformer on the left rear of the chassis is NOT the modulation transformer. Rather it is a 5-volt, 60-amp filament transformer for the 304TL's. CLICKING HERE or on the image at left brings up a larger version of this photo (1167 x 877 px, 267 kB). CLICKING HERE _______ takes you to an index page for all the modulator and power-supply progress images
Globe Master 304TL Modulator Project	THIS is the modulation transformer, professionally rewound on a 2.2 kVA core by the original builder CLICKING HERE or on the image at left brings up a larger, complete version of this photo (1200 x 800 px, 850 kB). CLICKING HERE ________ takes you to an index page for all the modulator and power-supply progress images
	CLICKING HERE or on the image at left takes you to Henry's Tesla Coil website for some electrifying images of truly high-voltage RF at work and play . (Once there, click on the 833A tube in the center to enter the domain of the eminent Dr. Hankenstein).