The Heathkit Virtual Museum

RX-1 "Mohawk" Ham Receiver

Amateur band coverage only for maximum stability and accuracy
1 uv input for 10 db signal to noise ratio
Factory assembled and aligned coil/bandwidth assembly
Rotating slide rule tuning dial with vernier action
Built-in 100 kc crystal calibrator

Designed for extra performance ... "Mohawk" DELUXE AMATEUR RECEIVER

Styled to match the "Apache" transmitter the "Mohawk" ham band receiver provides all the functions required for clear, rock-steady reception. Designed especially for ham band operation this 15-tube receiver features double conversion with IF's at 1682 kc and 50 kc and covers all the amateur frequencies from 160 through 10 meters on 7 bands with an extra band calibrated to cover 6 and 2 meters using a converter. Specifically designed for single sideband reception with crystal controlled oscillators for upper and lower sideband selection. A completely preassembled wired and aligned front end coil bandswitch assembly assures ease of construction and top performance of the finished unit. Other features include 5 selectivity positions from 5 kc to 500 CPS, bridge T-notch filter for excellent heterodyne rejection, and a built-in 100 kc crystal calibrator.

This inside rear view of the RX-1 shows the high quality materials used in its design. The critical front-end coil/bandswitch assembly on the left half of the chassis is furnished completely assembled and aligned, thus eliminating the most difficult part of receiver adjustment. Ceramic coil forms and bandswitch wafers are used for stability and high "Q".

The set provides a 10 db signal-to-noise ratio at less than 1 microvolt input. Each ham band is separately calibrated on a rotating slide rule dial to provide clear frequency settings with more than ample bandspread. Front panel features S-meter, separate RF, IF and AF gain controls, T-notch tuning, T-notch depth, ANL, AVC, BFO, Bandswitch tuning, antenna trimmer, calibrate set, calibrate on, CW-SSB-AM, receive-standby, upper-lower sideband, selectivity, phone jack and illuminated gear driven vernier slide rule tuning dial. Attractively styled with die-cast aluminum control knobs and escutcheons. The all-steel cabinet features a convenient top-access hatch. No external alignment equipment is required for precise calibration of the "Mohawk". All adjustments are easily accomplished using the unique method described in the manual. An outstanding buy in a communications receiver.

Specifications--Fifteen tube double conversion superheterodyne receiver with selectable sideband. First IF frequency: 1682 KC. Second IF frequency: 50 KC. Band coverage: 160-10 meters. Selectivity range: 5 kc, 3 kc, 2 kc, 1 kc, .5kc. Bridged T notch filer: 50 db rejection notch. Panel controls: RF Gain, Tuning, IF Gain, Antenna Trimmer, AF Gain w/on-off switch, Calibrate Set, T-Notch Tuning, Calibrate On, T-Notch Depth, CW-SSB-AM, ANL, Receive-Standby, AVC, Upper-Lower Sideband, BFO, Selectivity, Band, Phones. Tube complement: 6BZ6 RF AMplifier, 6SC6 First Mixer, 12AT7 Oscillator-Cathode Follower, 6BA6 1682 kc IF amplifier, 6CS6 Second mixer, 12AT7 1632-1732 kc crystal Oscillator, 6BA6 50 kc IF amplifier, 6BJ7 DET-AVC-ANL, 6SC6 Product Detector, 12AT7 First Audio S Meter Amp., 6AQ5 Audio Output, 6BA6 100 kc Oscillator, OA2 Voltage Regulator, 5V4 Rectifier. Signal to noise ratio: 10 db at less than 1 microvolt input. Power required: 117 VAC, 50/60 cycle, 75 watts. Cabinet size: 19½" W x 11 5/8" H x 16" D.