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G8MNY  > TECHNI   18.11.21 11:30l 139 Lines 6636 Bytes #999 (0) @ WW
BID : 53374_GB7CIP
Read: GUEST
Subj: Rotator Kenpro KR400rc info
Path: PI8DRE<PI8CDR<DB0RES<DB0ERF<DK0WUE<PE1RRR<KD8FMR<PY2BIL<TI0RC<CX2SA<
      ED1ZAC<GB7CIP
Sent: 211118/1017Z @:GB7CIP.#32.GBR.EURO #:53374 [Caterham Surrey GBR]
From: G8MNY@GB7CIP.#32.GBR.EURO
To  : TECH@WW

By G8MNY                                       (Updated Apr 20)
(8 Bit ASCII graphics use code page 437 or 850, Terminal Font)

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\
           oĴMotor o1
                 \.__,/       Dial
           ĴĴ  Motor
       2     D1       C1      Drivers
       o)´>)R5+13V
                ===           R3    __   ===C5
                 C4       \     D7\_/,  __                 SERVO
           <)Ĵ          Ĵ  13v__                       LOOP
            D2            e/                   Q4           GAIN>
                             __D5              ,/3L1>VR1
                          R1  \_/  R7R9<1      ===       >
    14V             ===                      `\2Ŀ  __C7     
     (    Bridge     C2           ,/2    R11Ĵ ////       
     (     Rec          Ĵ    <6  Q3          R13  Balanced 
     (____o___                       `\3Ŀ    R12Ĵ Comparitor 
     (      __      Ŀ     __              ,/6            
Power(                 __ R2  \_/D6       R10<7                
o/ o(  (B1)                e                   `\5L2
    )       D3             \           R8     Q4    ===  RFI
    )    Ĵ>    ===C3     Ĵ         __         C8__ filter
    )        D4            /  R4
 1A ) oĴ<R6 -13V
ooٺ    3                                __   ===C6
Fuse                                   D8 \_/,  __
                                       13v__
                                                             5
      _______________________o\ o___________________* 5 *___())))___
     (                      ____o RIGHT    AC Cap          MOTOR   
     (                                  === C12          WINDINGS  
     ( 26V                 _o\ o__________________* 4 *___())))___
     ( 2A (32V off load!)       o LEFT                       5     
     (______________________________________________* 6 *___________
                                          Motor Common

+13V R14Ŀ
                                      8
                              )oĿ
 <)R15Ŀ           R23 >RV3
VR1                                    CAL
 <))))))o15  
                                               RESISTANCE
                        Ĵ     o         BRIDGE
                       R21 VR2   R24   9   DIAL
      )Ŀ        Ĵ  o>VR4
                                     7    500
          R16                     10       
              R18    )o
     ===     \   Current        R25                     ROTATOR
    C9    Q5 Ĵ Limiter    R22   o* 2 *>VR5
           e/   \  C10               6                    500
              Q6 R19Ŀ                   C11===        
               e/ ===           5                        
-13V R20o* 3 *

     o = Internal PCB wiring points          * = External Terminals


COMPONENT
No   R    |  No    R      C      D        Q      VR    L       B
13  10k   |   1   220    10n  1N4002  2SC1815   20k  220uH  14V Bulb
14   1k   |   2   220   100u  1N4002  2SA1015   20k  220uH
15   1k   |   3   10k   100u  1N4002  LM 741    10k
16  390   |   4   10k    10n  1N4002  NMJ4558   500
17  820   |   5   150    10n  1S1588  2SC1815   500
18  47k   |   6   150    10n  1S1588  2SC1815
19  33k   |   7  560k    10n   WZ130
20  330   |   8  560k    10n   WZ130
21  10k   |   9   10k   100u
22   1k   |  10   10k    10n
23  820   |  11  150k    10n
24  5k6   |  12  150k   100u AC
25   2

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 due to 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.

MODIFICATIONS
I use mine for /P work & have done some mods...

1/ Add a 22 in series with the lamp, to improve lamp lifetime.

2/ Add an 8 10W in series with motor common on the transformer (*6*) reduces
   the super saturation of the motor on 240V 50Hz on low loss leads. As the
   motor can work down to 18V with hardly any loss of torque, & for much longer
   before it catches fire. (motor is nearly 100C 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


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