General Radio Co. Unit Oscillator 1208-b Antique Vintage Ham Radio Equipment

US $300

Edinburg, Texas, United States
Aug 21st

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General Radio Co. Unit Oscillator 1208-B Antique Vintage Ham Radio Equipment. I have not tested this item, It is an antique, it is being sold As is. No returns accepted, final sale. I received this item, along with other HAM radio equipment from a family friend who was a long-time HAM hobbyist. It's been in storage a long time, so it has some dust on it. Some gunk on the surface of the cable. The Dial turns just fine. The shell is in pretty good condition, has some old labels on it. Examine the high quality, close-up photos for this item's exact condition before purchase, what you see is exactly what you'll receive. From what I've seen, it was manufactured between 1959-1965. You can find out information for this item in manuals which are available online, or on radiomuseum website. From Archive.org, (I did not write the following): TYPE 1208 -B UNIT OSCILLATOR Section 1 INTRODUCTION 1.1 PURPOSE. The Type 1208-B Unit Oscillator (Figure l)is a general- purpose power source for the radio -frequency laboratory. Covering the range from 65 to 500 Me, this member of the convenient Unit Instru- ment line can be used to drive bridges, slotted lines, impedance com- parators, and other measuring equipment. Used with a voltmeter and attenuator, it provides an accurately known output voltage for the test- ing of receivers. Direct amplitude modulation is possible over the au- dio-frequency range, and amplitude modulation free from incidental fm canbe obtained with a simple crystal-diode modulator over the frequen- cy range from zero to 5 Me. Connected to a mixer, the Unit Oscillator can be used as the local oscillator in a heterodyne receiver to convert a Type 12 16- A Unit I-F Amplifier or a low-frequency communications receiver into a detector for v-h-f and u-h-f signals. Pulsing and linear 100-percent amplitude modulation can be obtained with an external bal- anced modulator. 1.2 DESCRIPTION. The tuning system of the Type 1208-B Unit Oscil- lator is a "contact-type" circuit, which combines a variable air capaci- tor and a variable inductor in a single unit. Inductance varies from 0.06 ph at the low-frequency end to 0.01 ph at the high-frequency end, and ca- pacitance varies from 100 ppf to 8 ppf. Rotor and stator plates are shaped so that frequency varies logarithmically with dial rotation. The vernier dial requires about 4-1/2 turns to rotate the main dial over its full 270 degrees. The frequency calibration is accurate within 2percent. Plate and grid of the Type 2C43 Lighthouse oscillator tube are connected to the tuned circuit, and the cathode shell is grounded. The oscillator circuit is of the Colpitts type, with feedback determined by the electrode capacitances of the tube. The output system is a short coaxial line, with a coupling loop on one end and a Type 874 Coaxial Connector on the other. Coupling be- tween the loop and the oscillator can be adjusted over a wide range, and the loop canbe clamped in the desired position. Maximum power canbe delivered to load impedances normally encountered in coaxial systems. Type 1208-B Serial 2244 65-500 Megacycles General Radio Company Concord Massachussets USA US PAT 2548457 116R General Radio Type 874 (protruding orifice Message me through Ebay if you should have any questions BEFORE purchase.

Condition:	Used: An item that has been used previously. The item may have some signs of cosmetic wear, but is fully operational and functions as intended. This item may be a floor model or store return that has been used. See the seller’s listing for full details and description of any imperfections. ...	Brand	General
Country/Region of Manufacture	United States
Product Type	Unit Oscillator