Hal Communications CWR6850, Instruction Manual

Page: 52 / 64

CHAPTER 6 PAGE 52
CIRCUIT BOABD JUMPER FUNCTIONS
BOARD JUMPER JP OPEN CKT JP SHORT CKT
MODEM (bottom) JP-1 Set Mark Tone Set Space Tone
DIGITAL (top) JP-1 SW OUT FSK: SW OUT FSK:
MARK = "ON" SPACE = "ON"
JP-2 SW OUT CW: SW OUT CW:
+/- CW Keying +CW keying only
0.8 V offset 0.2 V offset
NOTES: 1. JP is used to align the transmit AFSK tones; use clip to chassis ground
from pin at JP.
2. Use "solder-bridge" to "short" JP-1 & JP-2.
ADJUSTMENTS AND MEASUREMENTS ON DIGITAL (TOP) BOARD
CONTROL/TP ACTION
VR-1
VR-2
VR-3
VR-4
VR-5
VR-6
TP-6
Adjusts frequency of CW sidetone oscillator; set to 800 Hz at TP-1 AFTER ADJUST-
ING VR-2.
Adjust center frequency of CW PLL filter; ADJUST BEFORE VR-1. With no signal in-
put, set VR-2 for 800 Hz at TP-2.
Adjust minimum CW transmit speed. Set SPEED slide control to minimum (0) and
adjust VR-3 for CW transmit speed desired. (Measured at TP-3)
Adjust maximum CW transmit speed. Set SPEED slide control to maximum (10)
and adjust VR-4 for CW transmit speed desired. (Measured at TP-3)
Adjusts center frequency of CW active filter. Feed 10-20 mV, 800 Hz signal into AF
input, adjust VR-5 for maximum signal at TP-5 (use oscilloscope).
Adjust contrast of the internal CRT display.
Measure CW transmit speed; CW WPM = 2.667 × freq.
ADJUSTMENTS AND MEASUREMENTS ON MODEM (BOTTOM) BOARD
1. SET RECEIVE RTTY FILTERS:
Set-up as follows:
1. SEND-AUTO-HECEIVE to SEND
2. RX-TAPE to TAPE
3. Connect AFSK OUT-TAPE to AF IN-TAPE
4. SHIFT slide control to "0" (center detent)
5. AFSK GAIN control fully clockwise
6. Connect oscilloscope to TP-3 or TP-4 as indicated.
7. Open or short JP-1 as indicated.