Scheme of remote frequency setting of the transceiver. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Nodes of amateur radio equipment
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Because Since the PC is not always near the transceiver, DM2AUO suggested a scheme for remotely setting the frequency of the transceiver. For those who like to work with PSK31, SSTV or FAX, manual frequency setting is very often a problem, the solution of which can be remote control of the transceiver, independent of the computer. In modern transceivers, the receive and transmit frequencies can be changed in 10 Hz steps using keys controlled by the "Up" and "Down" buttons through the microphone jack. If the buttons are pressed briefly, the frequency changes in steps, and if pressed for a longer time, the frequency changes smoothly. If the control input of these switches is excited by a sequence of short presses of the button, then a continuous and slow change in frequency can be obtained.
The author solved this problem electronically, using a microphone connector to communicate with the transceiver, especially since a supply voltage from 5 to 12 V is also supplied through it with a possible consumption of 10 ... 40 mA (depending on the transceiver model).
Ris.1
The 4047 universal IC can operate as a monostable or astable multivibrator. Its power is in the range of 5 ... 15 V, and the current is negligible. In the circuit of Fig. 41, IC 4047 is used as an astable multivibrator. If jumper JP1 is inserted, the multivibrator works. When the "Up" or "Down" button is pressed, the corresponding transistors Ts1 or Ts2 are controlled, which, through an open collector-emitter junction, connect the corresponding contact of the transceiver to a common wire. The consumption of the device in working condition is 0,5 mA (Up.=5 V); 0,8 mA (Upp.=8 V); 1,4 mA (Upp.=12 V). R4 sets the tuning speed from 1 kHz/min to 6 kHz/min.
Author: Max Perner (DM2AUO); Publication: N. Bolshakov, rf.atnn.ru
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