Mark Audio AS 101S Bedienungsanleitung

1 Optimizing the Heathkit HW-101, SB100-102 Transceivers he Heathkit HW/SB series of transceivers were very popular in the late 60's through

2 Figure 1 Improved CW Operation: In the CW mode the rig’s relays are energized by the CW sidetone amplifier's sidetone output driving the

3 1) Connect a .001 µfd disk capacitor (DO NOT use a higher value) from relay RL1 pin 1, to ground (Figure 1). 2) Connect a piece of wire about 8”

4 Transmit Improvements: The transmitter audio quality can be improved by changing the value of coupling capacitor C11 on the modulator board from

5 Receive Improvements: The receiver’s strong signal-handling capability and audio quality can be vastly improved by the following changes: During

6 Figure 4 Additional rolloff of the high frequency response will remove the raspy nature of the receive audio, and this is accomplished by changi

7 Figure 5 I.F. Filter Passband Improvements: I believe the crystals that Heath supplied for the carrier oscillator were of fairly wide tolera

8 If the carrier oscillator frequency is placed too far from the filter passband, the receive and transmit signals will lack “lows” but the opposite

9 3394.91 kHz. The CW power output while using the CW filter went from 50 watts to 110 watts. I also soldered a short loop of wire to the center lu