©1994 Hamtronics, Inc.; Hilton NY; USA. All rights reserved. Hamtronics is a registered trademark. Revised: 1/31/00
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Page 1: ...a transmitter when required Some of the square wave audio tone signal from the phase lock oscillator in U2 is low pass filtered by R8 C13 and R9 C14 to provide a quasi sinewave tone signal This is am...
Page 2: ...T CIRCUIT Output terminal E2 is connected to the receiver circuit being switched Normally the unit is used to inhibit the repeater by grounding the COS signal from the receiver to the COR board in the...
Page 3: ...heck for response of the TD 3 is to monitor the COS voltage at the feedthrough cap on the receiver enclosure Since the response bandwidth range of tone frequencies which will be detected is proportion...
Page 4: ...2 uF electrolytic C7 10 uF electrolytic C8 47 uF electrolytic C9 C14 0 15 uF polyester C15 2 2 uF electrolytic CR1 1N4148 Q1 Q3 2N3904 or 2N4124 R1 R3 47K R4 20K or 22K pot 203 223 or 22K R5 27K R6 5...
Page 5: ...1994 Hamtronics Inc Hilton NY USA All rights reserved Hamtronics is a registered trademark Revised 1 31 00 Page 5...
