DX100U DX 100 DX 100U
Circuit Diagram, Service
Information, Schematic Diagrams and Manuals
For Repairing, Restoration and
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|The Heathkit DX -100U
amateur radio transmitter, the only external requirements were an antenna,
key or microphone and an earth.
Panel control allowed Phone or CW
operation on all amateur bands up to 30 Mc/s.
The DX-100U included three
power supplies, low voltage, main HT voltage and fixed bias, four radio
frequency stages and four audio stages.
RF Power output
watts phone 120-140 watts CW.
160, 80, 40, 20,
15 and 10 metres.
| Audio - outpu
80 watts at
500 ohms is available to drive an external modulator or a PA system.
volts or 195 to 250 volts AC (45 to 65 cycles) Stand by 150 watts.
400 watts intermittent Phone 450-600 watts Continuous.
The unit weighs
As a Download
I can supply a copy of the Assembly and Operation Manual that was
supplied with the DX100 kit.
It has complete constructional layouts and
manual is for the DX100U, I also include a circuit of the DX100 as there are slight differences.
After a complete renovation my DX100 has given very little trouble, the only additional components to fail were a couple of anode loads in the modulator preamp 100k & 470k as they are difficult to get at I recommend replacing them.
If you have trouble tuning up on 160 meters rewind the large extra inductance in the PA anode circuit.
Two Circuits diagrams DX100 & DX100U.
22 Layouts construction diagrams and chassis views.
Typical meter readings.
Full construction details.
Transmitter tuning and alignment.
Power Output Levels.
Resistance charts, measurement of resistance to chassis from various points.
Picture of front panel with controls labelled.
Power supply circuit and layout part of main diagram.
It is comprehensive and gives all the relevant information to build or renovate a
DX100 or DX100U Transmitter, I used this manual to renovate my DX100.
Assembly and Operation Manual.
Manuals are Available Worldwide as a Download.
Manual 67 A4 pages worldwide
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But in the unlikely event that any data should not be as you expected.
A refund is always available. Kind Regards Allen and Alanna.