ELECTRICAL SPECIFICATIONS

UNPACKING

These instructions cover the operation and installation of the Craftsmen RCIO FM - AM Tuner. The entire manual should be read before installing the unit, since much general information is included that will be of value in making any custom-built installation,

As soon as the tuner has been unpacked, examine it for any apparent damage which might have occured in shipment. Should any sign of damage be found, file a claim - immediately with the carrier stating the extent of the damage.

Included with the RC10 tuner chassis should be the following:
1 3B023 Brass escutcheon
1 7X403 AM low-impedance antenna
1 7X604 Shielded audio cable

CABINET INSTALLATION

GENERAL - Considerable thought should be giver in respect to the installation of the chassis in order to obtain maximum benefit from the operating ease the chassis offers. The dial and controls should be positioned for easy access and reading which, in many cases, can be improved with a sloping front panel. If the mounting board cannot be readily tilted, wooden spacers can be inserted under the front mounting holes to provide the necessary inclination Position the knobs sufficiently above any front projection to provide ample finger clearance for adjusting the knobs.

The types and orientation of the tubes used in the tuner permit satisfactory operation regardless of mounting position.

Other considerations in layout are accessibility to the rear for interconnections, sufficient clearance from an: metal for the AM loop to insure good pickup, and ample air space above the tubes to prevent any deterioration to a finished wooden cabinet top from tube heat. Where the spacing is necessarily close, this effect may be alleviated with a thin sheet of bright metal tacked beneath the vulnerable surface.

VENTILATION - Considerable ventilation must be provided to carry off the heat dissipated by the receiver, A ' chimney effect " can be utilized advantageously in wall or bookcase installations by providing ports near the bottom and top of the enclosure to effect a flow of air past the chassis,

ASSEMBLY - The front panel cutouts should be made first by using the full-scale template provided. Note that this template is laid out symmetrically about the center knob and above the bottom mounting surface of the rubber shock mounts, Locate and drill the mounting holes as shown in Figure 4. Insert the studs on the rear of the dial escutcheon into the two 3 / 16 - in, diameter holes in the panel and secure the escutcheon with the two # 6-32 nuts provided.

Remove the five press-fit knobs (use a steady outward pull on the knob) and the four mounting screws and washers found in the chassis mounts. Locate the chassis so that a 1 / 16 - in, clearance exists between the inward flange of the escutcheon and the dial glass. Replace the four washers and screws and finally press the five knobs on their shafts, noting that the lettering uppermost on the channel knob indicates the channel selected for use.

Fig. 4. Mounting Hole Layout

A connection directly to the FM and AM detectors is available at the receptacle labeled Detector Output. This output bypasses the entire RCIO audio system including the tone and volume controls and is useful for feeding recording amplifiers which have preset tone compensation while using the Amplifier Output for monitoring purposes. An audio amplifier with self-contained controls can also be fed from the Detector Output and the Phono or Television inputs will operate thru the band switch even with the tuner power OFF,

Extreme care should be taken with connections to the Detector Output receptacle, Only low capacity cable should be used to prevent loss in high-frequency response.

PHONO - Either a reluctance or crystal type phono cartridge may be connected into the Phono input receptacle. For use with a crystal cartridge the pre amplifier selector switch lever located on top of chassis should be thrown toward the gang-in which position the phono pre-amplifier is bypassed and not in the circuit. When using a reluctance type cartridge (GE, Pickering), throw the switch knob away from the gang to add 24db. gain and bass compensation as shown in Figure 3.

ANTENNA - Several antenna arrangements are possible for use with the RCI0 as shown in Figure 6 and the best arrangement will depend on the particular installation. The various antenna arrangements make use of AM inputs at either high-impedance (shorting link removed) or low-impedance (shorting link in place), a single-ended FM and AM signals as well. This can be done by coupling input, and an input marked "S" connected internally through a switch to either the FM or AM input.

For reception in local or urban localities, loop the flexible ribbon lead (furnished) around the cabinet interior and connect to terminals marked "S" and " G Finally connect the shorting link between the blank terminal and "G" This ribbon tead forms a low-noise, low-impedance AM loop antenna and should be formed into the largest one or two turn loop practical in the available cabinet space. This loop also provides FM reception since terminal "S" is internally switched to the FM input,

Installations remote from stations might require outside antennas of a more elaborate nature, Connect exterior FM antennas to terminals FM " and'G or if to be used as an AM aerial as well, then connect to "S" and 'G '. Long-line AM aerials can be connected directly to the high-impedance input "AM" (link disconnected) or if brought down through a low-impedance line, to "AM" with the link in place,

Finally for installations including television, it is usually convenient to use the TV antenna to feed the FM lightly (through a 1000 - ohm resistor) from terminal "S" to one side of the TV antenna terminals.

TELEVISION - Complete suggested interconnections for installations including television are shown in Figure
7. In general, it is desirable not to operate a television unit while attempting either FM or AM reception because of the various types of interference that may be encountered.

Fig. 5. Rear View

Fig. 6. Antenna Arrangements

Fig. 7. Typical Installation Interconnections

RC 10 BLOCK DIAGRAM

DIAL CORD DRIVE

SERVICE INSTRUCTIONS

ALIGNMENT PROCEDURE To set pointer, completely mesh tuning capacitor and align pointer with last reference mark at low frequency end of dial. Volume control should be in maximum clockwise position, Output of signal generator should be no higher than necessary to obtain an output reading. Low side of signal generator and indicating meter should be connected directly to chassis at all times. Use an insulated screwdriver with 1/16" thick blade for adjusting IF transformers.

REPLACEMENT PARTS LIST