Specifications Heathkit HX-1681 QSK CW Transmitter


RF Power Output................................. 100 watts (nominal) on 80 thru 15 meters
                			     	    75 watts (nominal) on 10 meters.

Output Impedance................................ 50 ohms, less than 2:1 SWR


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

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

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

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

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

Harmonic Radiation.............................. At least 50 dB down at rated RF power output.

Spurious Radiation.............................. At least 60 dB down at rated RF power output.

Mode of Operation............................... CW Only

Keying Characteristics.......................... Break-in with automatic antenna switching and
                                                 muting of the companion HR-1680 Receiver.
                                                 Provision for operation of a linear amplifier.

Muting.......................................... Completes external ground at Mute socket.

CW Sidetone..................................... Internaly generated. Connected to companion
                                                 HR-1680 Receiver. Adjustable level and adjustable
                                                 frequency audio tone.

Active Devices.................................. All solid-state except driver and final tubes.
                                                (12BY7 Driver 6146A Finals) Note: I substituted
                                                 6146B's wiith no problem when 6146A's became
                                                 damn near imposible to get!)

Front Panel Controls and Connections 	Main (VFO) tuning
					Sidetone Level/Power on-off switch.
					CW Level
					Band Switch
					Final Tuning
					Driver Tuning
					Meter Switch
					Mode Switch
					Key Jack

Power Requirements			700 to 850 Volts to 250 mA with max ripple of 1%
(HP-23B AC Supply or HP-13B DC		250 volts at 50 Ma with maximum ripple .05%
Mobile Supply)				-130 Volts at 10 mA with .5% ripple
					12.6 volts AC/DC at 2.5 amps.
 


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				12-1/8 Lbs (15.5 kg.)