F - M CHANNEL NUMBERS
The table below gives the frequencies for the even-numbered F - M channels. The intervening ones can be obtained by adding or subtracting 0.2 MC., which is the spacing between channels.

Designed for high-fidelity reception in the new high frequency FM band as well as quality reception in the standard AM broadcast band, the Browning Universal FM - AM Tuner Model RJ - 12 is primarily intended for those who wish to build radio sets into bookcases, drawers, shelves, walls, or cabinets. Its extreme sensitivity and high fidelity are not exceeded in the most expensive of commercial home radios. The Model kJ - 14 is the RJ - 12 mounted on a rack panel for laboratory and special uses. Employs Major Armstrong's circuit on FM.

INSTALLATION In mounting the unit, due consideration must be given to ventilation, Approximately 65 watts of heat must be dissipated. Position of mounting of the unit is unimportant.

The loudspeaker used should, for best results, be located a few feet from the RJ - 12 and the audio amplifier. If the speaker is in the same cabinet with the tuner end audio amplifier, placing these latter two units on felt or rubber padding may improve the quality of reception.

The following components are necessary to complete & radio receiving system with the RJ - 12: a high fidelity audio amplifier, loudspeaker, antenna, and a power supply. The power supply may be omitted if the Audio amplifier can provide the proper voltages and currents.

Any high quality audio amplifier and loudspeaker should work satisfactorily with the RJ - 12 tuner. The audio gain should be such that an input voltage of 0.1 volt will provide ample yoluce,

The tuner is designed for maximum performance when used with a 300 ohm FM Antenna. Host any comercial FM antenna having this impedance should work satisfactorily. It is important that no part of the antenna system be grounded, because of the balanced feed required on TL operation. On All operation the entire antenna and feeder system act as the antenna. The antenna system should be located as high as possible. For those who wish to build their own, a drawing has been provided to furnish the necessary information.

Shielded Leads from the tuner to the amplifier and also from the phonograph pickup to the female connectors in the rear of the RJ - 12 chassis are essential. The two male connectors will be found plugged into the female connectors in the RJ - 12 and several feet of shielded wire is packed with each tuner. Since individual installations will vary, this wire is uncut and not attaohed to the male connectors,

When making up the cables, the center conductor should be stripped and tinned, inserted in the center Sleeve of the inale connector, and heated until the solder flows making a good joint. Bring the braid up on the outside shell'of the plug and solder all the way around.

There are some cases where the shield on the leed between the audio output of the RJ - 12 and the amplifier employed may not be a sufficient ground bond be tween the two. In cases where there is any hum (not present in the audio amplifier itself), try bonding the RJ - 12 chassis to the audio amplifier with copper braid or number 16 or larger wire.

Power requirements for the RJ - 12 tuner arc 250 volts DC at 65 milliamperes and 6.3 volts AC or DC at 4 amperes. Often times these voltages can be made available from the audio amplifier. If these voltages are not available, separate power supply should be provided such as the Browning Model PF - 12, a schematic diagram of which is shown.

OPERATION
After proper installation, the set may be put into operation by turning the oi - OFF switch clockwise; the dial should be immediately illuminated. Witi in e minute of warming up, the tuning eye should amit a bright green glow. The set is ready for operation on Allow & in minute warm-up period for F.

AN or FM reception can be selected by the AN - TM PHONO switch. Starting with the band switch knob in the farthest counter-clockwise position and rotating clockwise gives AM - FM - PHONO reception. Rotate the TUNING knob to select the desired station, As the tuning approaches the station, the tuning eye will gradually close. Correot tuning is indicated by maximus eye closing. Increase the volume to the do sired level by rotating the VOLUME knob clockwise. In tuning in FM stations, always tune for the complete elimination of noise. In cases where the signal strength of the FI station is too low to saturate the dual limiter, some background noise may be expected For those who wish to incorporate phonograph connections to the tuner, a phono input connector is provided at the rear of the chassis. By turning the selector switch to the PHO O position, the phonograph input is connected to the amplifier through the VOLUME control; thus eliminating a separate volume control for phonograph operation.

It should be noted that while tuning between stations, both on FN and All, the rushing noise is normal for the tuner. The extreme high sensitivity is responsible for picking up random atmospherics, but this will be eliminated when a station is tuned in unless the signal strength of the station is of the same order of magnitude as that of the atmospheric noise,

ADJUSTMENT No adjustment should be made on the tuner aside from the panel controls. Adjustments and alignment on the FM portion should only be made by experienced personnel with the proper visual alignment equipment. Ordinary meters or aural methods are in general unsatisfactory for alignment. Replacement of tubes can usually be made without realignment.