Specifications Heathkit HX-1680 Receiver


Frequency Coverage (In MHz.)............ 3.5 to 4.0, 7.0 to 7.5, 14.0 to 14.5,
					 21.0 to 21.5, 28.0 to 28.5, 28.5 to 29.0 

Sensativity............................. Less than .5 microvolts for 10 dB signal-plus
                                         noise to noise ratio for SSB Operation.

IF Selectivity.......................... 2.1 kHz minimum 6 dB down
					 7 kHz maximum at 60 dB down

Overall audio response
	Wide............................ 2100 Hz minimum @ 6 dB down
					 7000 Hz maximum @ 60 dB down

	Narrow.......................... 250 Hz minimum @ 6 dB down
					 2500 Hz maximum @ 60 dB down
					 (center frequeency approximately 750 Hz.)

Overall Gain............................ Less than 1.5 microvolt input for 0.25 watts
                                         audio output.

Audio power output..................... .8 watts into 4 ohm load continious (1.2 watts peak power)
					at less than 10% THD

Dynamic Range.......................... 120 dB or greater

AGC Characterisitcs
	Blocking Level			3 Volts
	Time Constant			Attack Time less than 1 millisecond. Releas time switch
					selectable at 100 Microseconds (CW) or 1 second (SSB).

Intermodulation Distortion............. -60 dB

Image Rejection........................ 50 dB or better

IF Rejection........................... 60 dB or better.

Internaly Generated Spurious Signals... Below 1 microvolt equivalent antenna input except at
					3.74, 21.2, 28.6 and 28.9 MHz.

Mode of Operation...................... Selectable upper or lower sidband and CW

Frequency Stability.................... Less than 100 Hz/30 Minutes drift after 60 minutes 
					warmup; less than 100 Hz drift for +/- 10% change
					in primary voltage

Tuning Rate............................ Approximately 15 khz per turn.

Dail Accuracy.......................... Within 2 khz after callibration at the nearest 100 khz
					marker.

Muting................................. Shorted external Ground at Mute socket.

Sidetone input Level................... 10 Millivolts or greater (300 mV maximum).

Tuning Backlash........................ 50 hz or less per turn.


IF Frequencies
	First IF			8.395 to 8.895 MHz.
	Second IF			3.395 MHz.

Antenna Input Impedence			50 ohms unbalanced.

Temperature range			14  F. to 122 F.

Front Panel Controls and Connections 	Af Gain control/ Power on-off.
					Preselector
					RF Gain.
					Main (VFO) tuning
					Band switch.
					Function Switch
					Mode Switch
					Headset Jack.

Power Requirements			120 or 240volts AC (50/60 Hz) 27 watts maximum or
					11.5 VDC  to 15 VDC at .75 amperes maximum.

Dimensions:				12-3/4" wide x 6-3/4" high x 12" deep
					(32.4 x 17.2 x 3 0.5 cm.)

Net weight				9-3/4 Lbs (4.42 kg.)