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G8MNY  > TECHNI   18.11.21 11:20l 75 Lines 3618 Bytes #999 (0) @ WW
BID : 53371_GB7CIP
Read: GUEST
Subj: Rotator Alinco info
Path: PI8DRE<PI8CDR<DB0RES<ON0AR<SV1CMG<SR1BSZ<IW0QNL<IW2OHX<UA6ADV<LU4ECL<
      JE7YGF<GB7CIP
Sent: 211118/1003Z @:GB7CIP.#32.GBR.EURO #:53371 [Caterham Surrey GBR]
From: G8MNY@GB7CIP.#32.GBR.EURO
To  : TECH@WW

By G8MNY                                       (updated Aug 17)
(8 Bit ASCII graphics use code page 437 or 850, Terminal Font)

This is basic & reliable rotator with manual switch controls & regulated meter
heading readout.
 ___________ ___                    /ºº\  Stub Mast
³ ÚÄÄÄÄÄÄÄ¿ ³   \                  ³ ºº ³ Clamp Castings
³ ³ .-"-. ³ ³     \               _³_ºº_³_
³ ³'_____`³ ³      ³             /        \
³     0     ³      ³   6 Wire   ³__________³ ROTATOR         2 drilled
³ --------- ³      ³   Cable     ³________³                 steel strips
³ ³o³   [I] ³    _.Ù               ³ ºº ³  À option flat      ÚÄÄÄÄÄÄ¿
³___________³_.-'          Support ³ ºº ³    base plate      / /P Cow \
 CONTROLLER              Mast Clamp \ºº/     remove clamp   /field feet\


For /P use cow field feet strips, then a 66ft mast can be put on top of it with
a 3el HF TH33 & 5el 6m beam etc, without the rotator spinning on the ground.

DIAGRAM
LÄoÄÄoÂÄ¿   ÚÄÄÄÄÂÄÄÄÄÄÂÄÄÄÄÄÄ8êÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ* 6 *ÄÄÄÄÄÄÄ¿
  Fuse³  )º(     ³     ³    added        AC Common                    ³
  240V³  )º(     ³     ³                                              ³
 0.5u=== )º( 24V ³    33ê          Left                          2x8ê ³
 added³  )º(     ³     ³          ÚÄo\ oÄÄÄÂÄÄÄÄÄÄÄÄÄÄÄÄÄÄ* 5 *Ä())))Ä´
      ³  )º(     ³     ³          ³       ===130uF AC           ===== ³
NÄo/'oÁÄÙ  ÃÄÄÄÄÄ)ÄÄÄÄÄ)ÄÄÄÄÄÄÄÄÄÄÁÄo/ oÄÄÄÁÄÄÄÄÄÄÄÄÄÄÄÄÄÄ* 4 *Ä())))ÄÙ
  ON       ³     ³    _³_          Right                        MOTOR
           ³   120ê   \_/
           ³added³     ÃÄÄÄÂÄÄÄÄÄ¿
           ³     ³     ³ 470ê  ³/'  8.5V
           ³     ³     ³   ÃÄÄÄ´ REGULATOR   added
           ³     ³     ³   ³   ³\e            FB3,,
           ³     ³     ³   ³     ÀÄÄ100êÄÄÂÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ* 2 *ÄÄÄÄ¿
           ³   LAMP   +³   ³              ³     _''                ³
           ³     ³    ===  ÃÄÄÄ¿      10n===  /~ ~\  CAL          ROTOR
           ³     ³ 470u³  _³_  `\³   ,,   ÃÄÄ´MeterÃÄÄ8kÄÄ* 3 *ÄÄ>POT
           ³     ³     ³ '/_\    ÃÄÂÄÄÄÄÄÄ´  -\._./+ PRESET       500R
           ³     ³     ³ 9V³   e/³ ³ ''FB ³                        ³
           ³     ³     ³   ³   ³  ===1n  27ê     ,,                ³
           ÀÄÄÄÄÄÁÄÄÄÄÄÁÄÄÄÁÄÄÄÁÄÄÄÁÄÄÄÄÄÄÁÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ* 1 *ÄÄÄÄÙ
                           CURRENT LIMITER    FB2''
                                             added      * = External Connection
 
N.B. *1* to *6* = 24V AC could be useful for things!

The circuit could have been wired to use only 5 wires if the switch feed & AC
common were reversed, making 1 the new AC common to the motor, as well as the
pot earth.

MODS
1/ As with most rotators the motor is well over run, so if high usage (eg. more
   than 2 mins) is needed, then add a high wattage low value R (eg. 8ê 10W) in
   series with the motor common (*6*). This will increase motor run time before
   it overheats, without significantly reducing the available torque.

2/ Under running the lamp with 120R in series will increase its life. Silver
   foil the meter sides, & paint the top of the lamp white, this makes the
   lamp as bright as before & with less shadows.

3/ Also a 0u5 250V AC Cap across the mains will correct the transformer's power
   factor for /P operation (but not the motor run PF!).

4/ QRO on lower HF bands gets into the current limit transistor & reduces the
   meter reading, as a single FB on the base is not enough. FB2 has 5 turns &
   is in the cut PCB track. FB3 is just on the lead.


Why Don't U send an interesting Bul?

73 de John G8MNY @ GB7CIP


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