RCA WR-99A Crystal-Calibrated Marker Generator
Maintenance & repair
The RCA WR-99A Crystal-Calibrated Marker Generator has a dark grey, metal case and silver front panel. There is a white, rectangular tuning dial with red and black lines and numbers and a red needle. Below the dial there are four plastic, blue knobs: two large knobs with ridges on sides on top half and two smaller plastic, blue knobs with tabs on bottom of panel. In the center of panel, there are five black, ridged switches. At the bottom center, there is an on and off switch, output connector, and small speaker. Three small connectors are on the right side: two red and one black. There are vent slits on top quarter of back panel. A black rubber stopper is attached to all corners and there are vent holes on bottom. A black, plastic handle is attached to top with two silver-colored screws.
The RCA WR-99A Crystal-Calibrated Marker Generator is designed for use in alignment and troubleshooting of black-and-white and color-TV receivers, FM receivers, and other equipment operating in the frequency range from 19 to 260 Mc. The WR-99A provides an rf-output signal from 19 to 260 Mc in eight bands on fundamental frequencies. A wide choice of modulation facilities is provided, including 4.5 Mc, which produces dual markers on a sweep-response curve to mark the picture- and sound-carrier points on the curve. The WR-99A combines the functions of a marker generator, a horizontal bar pattern generator, and a heterodyne-frequency meter. The frequency of the internal variable frequency oscillator, as well as the frequency of an external signal, may be checked with high accuracy against internally generated calibrating beats at 1- or 10-MHz intervals throughout the tuning range. The WR-99A includes a harmonic crystal oscillator and a I-Mc oscillator which is coupled to the 10-Mc crystal oscillator for accuracy. Both these oscillators may be switched in or out from the front panel and provide audio calibrating beats from the speaker in the WR-99A.
The tuning dial is specially marked with all vhf sound- and picture-carrier frequencies. In addition, important color-TV frequencies are also marked on the dial scales. In TV servicing, the WR-99A may be used in checking alignment and bandpass characteristics of rf and if circuits and the scanning linearity of vertical-deflection circuits. The instrument may also be used to signal trace and trouble-shoot television receivers, and is useful in locating defective sections and stages.
This collection was donated by George Taniwaki, son of Michio Taniwaki (1926-2017).
Michio was a long-time Denver resident with a passion for analog electronics. Mitch, to his friends, was born in Alameda, California on May 30, 1926. In the depth of the depression, his family moved from Haywood, California back to Susaki, Japan where the family owned a farm. While still in high school, Mitch started his own radio repair business. As World War 2 was winding down, even though he was an American citizen, Mitch was drafted into the Japanese army. He was placed into a radio communications group stationed in Hiroshima. He was there on the day the atom bomb was dropped and has written and spoken about his experiences. After the war (1953), Mitch returned to the U.S., got married, and moved to Denver. Over his career, he worked for some well-known local electronics firms, including Ward Terry & Co., Valas TV, NBI, and Outbound Systems. He and his wife of 59 years, Hisae, raised two sons (George and James).
See accession file for more information about Michio Taniwaki and Taniwaki family history., RCA: The RCA brand is one of the oldest and well known brands in the consumer electronics industry. The brand was derived from an acronym for the company Radio Corporation of America, which was a major electronics company in existence from 1919 to 1986. Today (2019), VOXX Intl owns the RCA brand for its accessory and several audio video product lines. The company's roots are in the broadcast industry with early product focus on the marketing of GE and Westinghouse's radio equipment.
Business and financial conditions led to RCA's takeover by GE in 1986 and its subsequent break-up. GE then sold the rights to make RCA and GE brand consumer electronics products, notably television sets, to the French Thomson Consumer Electronics. Thomson sold the rights to the brand to Audiovox Corporation, first for consumer accessory products and then two years later for consumer audio and video products excluding televisions. Today's RCA products are marketed by Audiovox Accessories.
Taniwaki, Michio "Mitch," 1926-2017
Metal stamp, front panel: CRYSTAL-CALIBRATED MARKER GENERATOR / WR-99A; RCA [logo]; RF RANGE; RF TUNING; RF ATTENUATION / 60 db MAX; AF GAIN / POWER OFF; ON / OFF; OUTPUT; CAL/MOD; GND / RF IN / MOD IN
Label, printed, back center: CRYSTAL CALIBRATED / MARKER GENERATOR / Type WR-99A / 105-130 volts 50-60 cps / 45 watts / RADIO CORPORATION OF AMERICA / Electronic Components and Devices / Harrison, New Jersey / RCA [logo] ® / Trademark Reg. / Marca(s) Registrada(s) / EI 220
Handwritten in black ink and stamp, back, above cord: C-2-8 / 10083
Please see object for more front panel details.