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Hallicrafters HT-40 MK1, Operating And Service Instructions

The Hallicrafters HT-40 MK1 is a classic vintage radio transmitter known for its durability and superior performance. For those looking to get the most out of this piece of history, download the free Operating And Service Instructions manual from manualshive.com to ensure optimal use and maintenance of your HT-40 MK1.

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Summary of Contents for HT-40 MK1

Page 1: ...allicraliers OPERATING AND SERVICE INSTRUCTIONS COMMUNICATIONS TRANSMITTER MODEL HT 40 MARK I...

Page 2: ...thus defective This warranty does not extend to any of our radio products which have been sub ected to misuse neglect accident incorrect wiring not our own improper installation or to use in violatio...

Page 3: ...ering has been provided for control circuits and AC power lines Components were specifically selected to avoid undesired re sonances and arranged to prevent parasitic os cillation Another important T...

Page 4: ...WER CONSUMPTION 175 watts RF OUTPUT IMPEDANCE 50 to 75 ohm coaxial connector accepts Am phenol 83 1SP connector CW KEYING Panel mounted key jack accepts standard 2 connector 1 4 plug MICROPHONE INPUT...

Page 5: ...automatic keyer T O Keyer In addition to the KEY jack the keying instrument may be con nected to terminals 3 and 4 of the four terminal strip located on the rear of the chassis These con tacts are con...

Page 6: ...ON SWITCH AUXILIARY SWITCHING CONTACTS SWITCH CONTACTS SHOWN IN NORMAL OR RECEIVING POSITION NOTE A unique feature of the power supply allows current to be constantly fed through the bleeder w hen in...

Page 7: ...TPUT GRID CURRENT switch is a DPDT slide switch which permits the operator to switch the meter either into the grid circuit of the final amplifier 6DQ5 or across the RF output load 3 6 PLATE LOADING C...

Page 8: ...UT GRID CURRENT CQ c II II TRANSMITTER r r MODEL HT 40 Q s 3 CD 0 s 0 0 the hallicrafters co Q s FUNCTION BAND SELECTOR DRIVE CRYSTAL KEY CD C w 20 15 CRYSTAL VFO R F OUTPUT 4 0 STAND M G s 80 0 6 0 G...

Page 9: ...G 80 to 20 meter bands Near 100 10 and 6 meter band Near 0 2 Insert crystal of desired frequency into the CRYSTAL VFO socket 3 It may be desirable to insert the key plug into the KEY jack and close th...

Page 10: ...ion in Paragraph 4 2 step 1 through step 12 except that the CW key need not be plugged in The following procedure will complete the tuning of the transmitter for AM operation 1 Connect the microphone...

Page 11: ...d jack to the grid of V1B 6CX8 and the ground side of the VFO output is connected through the black jack and switch Sl in the VFO position to RF ground When Sl is in the VFO position the triode sectio...

Page 12: ...ATE TANK COI L 110 M TO BOM i C25 PLATE LOADING CAPACITOR LMI PI LOT LIGHT tion of the screen An RF filter between the micro phone jack and the grid of the MIKE preamplifier V1A eliminates distortion...

Page 13: ...ty tubes occur refer to the schematic diagram for proper voltage resistance and capacity values Table 1 provides suggestions for servlclllg the transmitter It is possible that this table is incomplete...

Page 14: ...hoke 053 000597 V3 12AX7 Microphone Pre C26 100 mm 2000V 10 L2 100 UH 200 MA RF choke 053 000644 Amplifier 1st and 2nd Audio Cer Disc 047 001601 L3 Coil Interstage Pi Amplifier 090 900038 C29 35 100 m...

Page 15: ...EG TI J RnR Li 6 3 V X 4 NOTES Ll4 E PLI 117VAC C41 60CPS f oOI Ll5 R25 56K i C43 f OOI LMI S3 ON OFF SWITCH ON REAR OF FUNCTION swrrCH 4 15A J2 SWITCH WAFER S2A FRONT SHORTING RING IS ELECTRICALLY CO...

Page 16: ...094 9027950 464 PRINTED IN U S A...

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