Radio Circular Co. W, Worldwide Schematic

Radio Circular Co. W, Worldwide

Get a print!

Product Information:
Model:W, Worldwide
Manufacturer:Radio Circular Co.

Schematic Pages

PNG: Page 1 Rider Manual Volume 7

Schematics Content

Page 1:


CAUTION Do not attempt to operate on current other than that noted on the instrument.
INSTALLATION A good aerial, 25 to 60 feet long, well away from surrounding metal structures and power lines, is essential for best results. Power noise interferes especially with short - Wave reception. If the set is located where power noise is prevalent it may be necessary to install an aerial high above the street and use a " transposition " lead-in to the set. A good ground connection (water pipe or equivalent) will also contribute to quieter reception,
CONTROL KNOBS The left hand knob is, initially, the power switch and thereafter, tone control. The second knob from the left is band selector switch. The third knob from the left is tuning control. The right hand knob is volume control.
OPERATION After the set has been properly installed by the attachment of guitable aerial and ground connection and the power cord plugged into an outlet of the proper voltage, the left hand knob is turned to the right and a few seconds allowed for the tubes to reach operating temperature. The second knob has five positions, each corresponding to one of the pumbers as shown on the dial. The volume control knob is turned full to the right and then the tuning knob turned slowly until the desired station is heard. Note that each frequency band is indicated on the dial by a number corresponding to the various positions of the band selector switch, and also that in connection with each band, there is shown on the dial the type of station that may be tuned in.
SERVICE NOTES If the radio fails to operate when unpacked, or stops working after a few days, proceed as follows: (1) Have the tubes checked. (2) Remove the chassis from the cabinet and check for loose connections. (3) Have a competent " Radio Service Man " check over entirely. Do not return unless you have made the above tests. This set left the factory carefully inspected.
The intermediate stages are carefully phased to 456KC at the factory. Should rephasing be necessary attach the output lead from a 456 KU test oscillator to the grid cap of the 6A7 tube, keep the signal to a very low audible value and carefully adjust the three trimmer screws, two in the top and one in the bottom of each of the two tall cans, to loudest volume. If an output preter is available it should be used across the two outside black leads at the speaker transformer. An all-wave oscillator having a range from 150 KC to 20 MC will be necessary to rephase the frequency bands, The oscillator output is attached to the aerial

Lead of the set and the oscillator output kept always at a low audible level. * The R.F. coil trimmers are reached through a series of five (6) holes in the side of the R.F. shield cans and correspond to frequency band Nos. 1, 2, 3, 4, and 5, from top down. The Oscillator parallel trimmers are seen on the under side of the set when the front of it is raised and are located alongside of the band switch, No. 1 being the one nearest the back of chassis and No. 5 nearest the front. The dual porcelain trimmers at back of chassis are series padders, the left hand for band No. 2 and the right hand one for band No. 1. The series padder for band No. 9 is the single trimmer at the center of the chassis. Each band is trimmed first at the minimum end of its range, band No. 5 being first, No. 4 second, then No. 3, etc. Bands 3, 2, and I are also tracked near their maximum ranges, or with the tuning condenser turned well in, by adjusting that series padder belonging to the particular band being used, location of which is given above.
NOTE - Should it be necessary to write to the factory for parts or information, always give the serial number of the set as stamped on the back of the chassis.
PHONOGRAPH - Install a single pole double throw toggle switch in rear flange of chassis near right-hand end. Disconnect 1 mfd condenger from volune control and connect to one side of switch, connect volume control to center terminal of awith, connect one side of phonograph pickup to other side of switch and remaining pickup terminal to remaining outside volume control terminal.
SHORT WAVE TIPS - In listening for short-wave broadcast DON'T forget to consider the difference in time between the location of the broadcaster and the receiver. DON'T expert to hear a station because it is on the air, as many things govern short-wave reception. DON'T get discouraged if reception is poor one night; it may be fine the next. DON'T expect stations to tune broadly; most stations tune sharply. DON'T tune below 10,000 kilo. cycles (above 30 meters) for distant stations in daylight DON'T expect to find station all parts of the dial. Short-wave stations are widely separated, except in a few instancer. DON'T skim over the dia), It requires some knowledge of tuning to get good results. Tune very slowly. DON'T pass up any weak signal, as it may often be brought in stronger by careful tuning