technical manual for sailor compact hf ssb t2130 - Gopher Proxy
technical manual for sailor compact hf ssb t2130 - Gopher Proxy
technical manual for sailor compact hf ssb t2130 - Gopher Proxy
You also want an ePaper? Increase the reach of your titles
YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.
5 CIRCUIT DESCRIPTION AND SCHEMATIC DIAGRAMS T2130<br />
TUNE MOTOR CONTROL<br />
The main functions of this circuit are to control the motor MO1 in the AT2110 at two speeds, high and low,<br />
and detect when the variable capacitor has rotated one half turn.<br />
The speed of the motor is selected from the microprocessor via the serial device bus and the shift register<br />
U14 (74HC595).<br />
Two identical circuits are connected to two outputs of U14.<br />
QA, pin 15 controls the low speed as the D07 zener diode is a 9.1 Volt type.<br />
QB, pin 1 controls the high speed as the D08 zener diode is an 18 Volt type.<br />
The selected zener voltage is buffered by the output transistors Q05 and Q06.<br />
When the motor is running as it does when the power is turned on (high speed) or when tuning the AT2110<br />
(high or low speed), a current flows in the emitting light diode in the optocoupler OC01 on the Main Board<br />
(1) in the AT2110. R05 and U10/2 on the Connection and Interface Board (2) and R25 on the Main Board<br />
(1) in the AT2110 ensure this. The detector in the optocoupler OC01 and Q01 on the Main Board (1) are<br />
both in saturation state caused by the light from the LED in the OC01.<br />
The transistor Q07 on the TX-processor (3) is on (controlled by the microprocessor). This ensures a<br />
current flow in R41 on the TX-processor (3) and in Q01 (and the detector in OC01) on the Main Board<br />
(1) in the AT2110.<br />
The collector of the Q01 on the main board in the AT2110 is sensed by the divider R40 and R39 and the<br />
Schmitt Trigger U04/4 (74HC132) which is connected to the microprocessor, port 5, bit 7, (U02, pin 24).<br />
The light is broken in the open type optocoupler OC01 on the Main Board (1) when the variable capacitor<br />
C01 in AT2110 has maximum capacity and when it has minimum capacity (every 180°).<br />
When the light is broken in the optocoupler OC01, the current flow stops in the detector in OC01 and Q01<br />
on the Main Board (1) in AT2110. This gives a level shift which is detected by Schmitt Trigger U04/4 and<br />
the microprocessor is in<strong>for</strong>med. The microprocessor turns off the supply voltage to the motor MO1 and<br />
the rotation stops.<br />
When the motor MO1 must run at low speed (the AT2110 is tuning) it is always started at high speed and<br />
reduced to low speed when the rotation has begun. The high speed time period is the time it takes to rotate<br />
the variable capacitor C01 so far that the light from the light emitter diode in OC01 turns on the detector<br />
in OC01 and the transistor Q01 on the Main Board (1). This is detected and the microprocessor will<br />
immediately change to low speed.<br />
9315<br />
PAGE 5-17