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Technical Bulletin

Rotator Kenpro KR400rc info

Page 1 of 3

Rotator Kenpro KR400rc info By G8MNY (8 Bit ASCII graphics use code page 437 or 850, Terminal Font) (Updated Apr 11)

This is a reliable rotator with manual L & R switches & servo motor driven heading 360° readout. It is simular to several ranges of models offered by different makers. It is almost identical to the KR600, that just has an extra wire & added motor stop switches. /\ ____________________ Stub Mast .-"~"-. ~-._ Clamp Castings /' | `\ ______ | | | " 5 Wire __________ ROTATOR \ / Cable ________ `·.___.·' [-][-] _. option flat ~ Support base plate CONTROLLER Mast Clamp \/ DIAGRAM __ /Dial\ oMotor o1 \.__,/ Dial Motor 2 D1 C1 Drivers o)>)R5+13V === R3 __ ===C5 C4 \ D7\_/, __ SERVO <) 13v__ LOOP D2 e/ ½Q4 GAIN> __D5 ,/3L1>VR1 R1 \_/ R7R9<1 === > 14V === `\2 __C7 ( Bridge C2 ,/2 R11 //// ( Rec <6 Q3 R13 Balanced (____o___ `\3 R12 Comparitor ( __ __ ,/6 Power( __ R2 \_/D6 R10<7 o/ o( (B1) e `\5L2 ) D3 \ R8 ½Q4 === RFI ) > ===C3 __ C8__ filter ) D4 / R4 1A ) o<R6 -13V oo 3 __ ===C6 Fuse D8 \_/, __ 13v__ 5Û _______________________o\ o___________________* 5 *___())))___ ( ____o RIGHT AC Cap MOTOR ( === C12 WINDINGS ( 26V _o\ o__________________* 4 *___())))___ ( 2A (32V off load!) o LEFT 5Û (______________________________________________* 6 *___________ Motor Common

G4APL

GB7CIP

21.03.2012

Technical Bulletin

Rotator Kenpro KR400rc info

Page 2 of 3

+13V R14 8 )o <)R15 R23 >RV3 VR1 CAL <))))))o15 RESISTANCE o BRIDGE R21 VR2 R24 9 DIAL ) o>VR4 7 500Û R16 10 R18 )o === \ Current R25 ROTATOR C9 Q5 Limiter R22 o* 2 *>VR5 e/ \ C10 6 500Û Q6 R19 C11=== e/ === 5 -13V R20o* 3 * o = Internal PCB wiring points COMPONENT No R 13 10k 14 1k 15 1k 16 390 17 820 18 47k 19 33k 20 330 21 10k 22 1k 23 820 24 5k6 25 2 * = External Terminals

| | | | | | | | | | | | |

No 1 2 3 4 5 6 7 8 9 10 11 12

R 220 220 10k 10k 150 150 560k 560k 10k 10k 150k 150k

C D 10n 1N4002 100u 1N4002 100u 1N4002 10n 1N4002 10n 1S1588 10n 1S1588 10n WZ130 10n WZ130 100u 10n 10n 100u AC

Q 2SC1815 2SA1015 LM 741 NMJ4558 2SC1815 2SC1815

VR 20k 20k 10k 500 500

L 220uH 220uH

B 14V Bulb

Common faults.. I have seen on more than one occasion, a split in the plastic pinion on the DC dial motor. This causes the dial hunting as the display servo can't find the matching dial pot balance. The cure is to remove the motor carefully slide the pinion off. Roughen up the D shaped shaft, & using a resin glue, glue back on the pinion, maintaining pressure across the crack until the glue has hardened, then reassemble & test. John G0JOP has had to replace the op-amp on his, I bet this was doe not static or mis-wire on pin 15 straight into the IC! Adding a few k ohm in series with the inductors L1 & L2 & 4 didoes on inputs to +/- rails may give protection! A problem Bryan G6ODE found was a loose pinion gear on the motor shaft in the rotator. Another problem Brian G8VPR mentions is the Rotator Pot going open circuit, so this the circuit should help do tests.

G4APL

GB7CIP

21.03.2012

Technical Bulletin

Rotator Kenpro KR400rc info

Page 3 of 3

MODIFICATIONS I use mine for /P work & have done some mods... 1/ Add a 22Û in series with the lamp, to improve lamp lifetime. 2/ Add an 8Û the super motor can before it 10W in series with motor common on the transformer (*6*) reduces saturation of the motor on 240V 50Hz on low loss leads. As the work down to 18V with hardly any loss of torque, & for much longer catches fire. (motor is nearly 100°C after 4 mins use!)

3/ Added a 0.47uF 300V AC across the 240V mains, to Power Factor correct the permanent transformer load. 4/ Keep the pointer screw just loose enough for fine manual direction adjustment. 5/ Wire colour coded labels & terminal screws. 6/ Heavy duty 6 way plug socket on long lead to ease dismantilling. Why don't U send an interesting bul? 73 de John G8MNY @ GB7CIP

G4APL

GB7CIP

21.03.2012

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