Linear permeability tuned VF0 with 1 kc dial divisions.

VF0 and crystal frequencies pre-mixed for all-band stability

Covers ham bands 80, 40, 20, 15 meters completely and 28.5 to 29.0 Mc of 10 meters with crystals furnished

Any ten 500 kc ranges between.l.5 and 30 Mc can be covered with accessory crystals for 180 meters, MARS, etc.(5.0-6.0 Mc not recommended)

Four bandwidths of selectivity, 0.4 kc, 3.2 kc, 2.4 kc and 4.8 kc

Pass band

Noise blanker that works on CW, SSB, and AM is built-in

Notch filter and 25 Kc crystal calibrator are built-in

Product detector for SSB/CW, diode detector for AM

Crystal Lattice Filter gives superior cross modulation and overload characteristics

Solid State Permeability Tuned VFO

10 tubes, 10 transistors, 17 diodes and 2 integrated circuits

AVC for SSB or high-speed break-in CW

Excellent Overload and Cross Modulation characteristic

FREQUENCY COVERAGE: Covers 3.5 to 4.0 MHz, 7.0 to 7.5 MHz, 14.0 to 14.5 MHz, 21.0 to 21.5 MHz, and 28.5 to 29.0 MHz.

	ACCESSORY COVERAGE: Ten accessory crystal sockets are provided. Coverage of any ten additional 500 KHz ranges between 1.5 and 30 MHz (except between 5.0 and 6.0 MHz) can be added by installing accessory crystals.
	SELECTIVITY: The R-4B tunable passband filter provides four passbands. With the selector  Set to .4 KHz, the bandwidth is .4 KHz at 6 dB down and 2.6 KHz at 60 dB down.  Set at 1.2 KHz, bandwidth is 1.2 KHz at 6 dB down and 4.8 KHz at 60 dB down.  Set at 2.4 KHz, bandwidth is 2.4 KHz at 6 dB down and 8.2 KHz at 60 dB down.  Set at 4.8 KHz, bandwidth is 4.8 KHz at 6 dB down and 20 KHz at 60 dB down.  Selectivity switching is independent of detector and AVC switching.
	INTERMEDIATE FREQUENCIES: First is 5645 KHz with crystal lattice filter, second is 50 KHz with tunable LC filter.
	STABILITY: After warm up, frequency will not drift more than +- 100 Hertz. Line voltage variation of +-10% will not cause frequency shift in excess of 100 Hertz.
	SENSITIVITY: 10 dB signal-plus-noise to noise ratio obtained on any amateur band with less than a .5 microvolt signal on the antenna.
	MODES OF OPERATION: SSB, CW, AM, RTTY
	SPURIOUS RESPONSES: Image rejection over 60 dB. I.F. rejection over 60 dB on amateur bands. Internal spurious response less than the equivalent of a 1microvolt antenna signal on all amateur bands.
	AVC: Amplified-delayed AVC with  slow (750 milliseconds) or  fast (25 milliseconds) discharge, and less than 100 microseconds charge time. A 60 dB change in R. F. input causes less than 3 dB change in audio output.
	INPUT IMPEDANCE: 52 ohms nominal OUTPUT IMPEDANCE: 4 ohms to speaker, 5000 ohms anti-vox AUDIO OUTPUT: 0.5 watt at AVC threshold, 1.5 watts maximum. POWER CONSUMPTION: 60 watts, 120/240 volts A.C., 50/60 Hertz SIZE: 5.5 inches high, 10.75 inches wide, 12.25 inches deep overall
	WEIGHT: 16 pounds.
	CALIBRATION: Better than _+-1 KHz when calibrated at nearest 100 KHz calibration point.
	HUM & NOISE: Greater than 60 dB below rated output.

TUBES AND SEMI CONDUCTORS

Symbol	Type	Function
V1	6BZ6	R. F. Amplifier
V2	6HS6	First Mixer
V3	12BE6	Second mixer and crystal oscillator
V4	12BA6	First I.F. Amplifier
V5	12BA6	Second I.F. Amplifier
V6	---	Symbol not used
V7	6EH5	Audio output
V8	6HS6	Pre-Mixer
V9	12BA6	Noise Blanker Amplifier
V10	12AX7A	Noise shaper and pulse amplifier
Q1	2N3394	Crystal Oscillator
Q2	FET TIS34	Variable Frequency Oscillator
Q3	2N3858	VFO Buffer Amplifier
Q4	2N3877	AVC Amplifier/detector
Q5	2N3394	AM Amplifier
Q6	2N3394	Beat Frequency Oscillator
Q7	2N3394	Audio Amplifier
Q8	TIS-34	Calibrator Oscillator
Q9	2N3394	Calibrator Trigger
Q10	2N3877	VFO Indicator Driver
D1	1N483A	Noise Pulse Detection
D2	1N483A	Noise Pulse Detection
D3	1N483A	Noise Blanking
D4,D5	1N3194	B+ Rectifiers
D6	1N3194	Bias Rectifier
D7	1N270	AM Detection
D9	1N714	Voltage Regulator
D10	1N483A	Switching Diode
D11,D12	1N270	Product Detection
D13,D15	1N483A	Steering Diode
D14	1N270	Switching Diode
D16	1N483A	Calibrator Supply Rectifier
D17	1N483A	Bias Clamping
IC1	923	Calibrator frequency divider
IC2	923	Calibrator frequency divider