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G8MNY > TECH 07.08.11 01:24l 77 Lines 3864 Bytes #999 (0) @ WW
BID : 10370_GB7CIP
Read: GUEST
Subj: Rotator Radio Shack info
Path: IZ3LSV<ED1ZAC<CX2SA<GB7CIP
Sent: 110806/2246Z @:GB7CIP.#32.GBR.EU #:10370 [Caterham] $:10370_GB7CIP
From: G8MNY@GB7CIP.#32.GBR.EU
To : TECH@WW
By G8MNY (Updated Nov 05)
(8 Bit ASCII graphics use code page 437 or 850, Terminal Font)
This is an offset rotator with an unusual rotator control system with no
electronics. It uses a movable control plate with 3 switches on it. The mains
is fed via slip rings the off home contact! And it uses a pulsed DC motor as a
control servo.
Stub Clamp
_______________ =³__³=
./-------------/ | __³____³____
_.-'.- _" `; _.-' | / )====)
.-' \__ . - ".-' | 4 Wire ³ ³ Mast Clamp
ÃÄÄÄÄÄÄÄÄÄÄÄÄÄÄ´ _.:| Cable À¿ )====)
³ ³ _..-:'-'" ÀÄÄÂÄÄÄÄÂÙ
ÀÄÄÄÄÄÄÄÄÄÄÄÄÄÄÁ:'-"' =³__³= Stub Clamp
CONTROLLER ROTATOR
DIAGRAM CAM CAM
SWITCH SWITCH AC ROTOR
x , x oÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÂÄÄÄÂÄÄ* 3 *ÄÂÄÄÄÄÄÄÄÄ¿ MOTOR
LÄoÄÄoÄÂ><Äo/' oÄ><¿ ÚÄÄÄÂÄoÄÄ> ÚÄ´<ÃÄo x o ³ o ())))Ä¿
Fuse ³ NOT )º( ³ o ³ <ÄÄoÄoÄÄ> ===120uF <ÄÄoÄ¿ ===== ³
³ HOME )º( ³ ³ ÃÄ´>³Äo o ³ o ³ ())))Ä´
0u1=== CONTACT )º( 18V³ ÀÄ)ÄÄÄÄÄÄÄÄÄÄÄÄÄÄÁÄÄÄÁÄÄ* 2 *ÄÁÄÄÄÄÄ)ÄÄÙ 2x ³
³ )º( ³ 27ê ³ 6ê ³
NÄÄÄÄÄÄÁÄÄÄÄÄÄÄÄÄÄÄÙ³ ³ DIAL ÃÄÄ180êÄÄÄÄÄÂÄÄÄÄÄÄÄÄÄ* 4 *ÄÄ27êÄÄÙ ³
³ ³ LAMP ³ ____ ³ 5W ³
³ ³ ³ ³ /DIAL\ ³ ³
³ ³ ³ ÀÄ´MOTOR ÃÄÄ´ ³
³ ³ ³ \.__./ o ³ CAL R O T A T O R ³
³ ³ ³ o ³ BUTTON ³
EÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÁÄÁÄÄÄÁÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÁÄÄÄÄÄÄÄÄÄ* 1 *ÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÙ
x = Indicator Plate Switches, >< = Slip Rings, * = External Connection
OPERATION
On moving the control knob & plate these switches power the rotator (lamp comes
on). AC of the right phase direction is passed to the rotator motor & DC of the
right polarity is selected for the dial motor.
The dial plate above the control plate that carries the lamp is moved around by
a DC pulsed dial motor. The on time of this motor just enough to make its' own
cam stay in step with the rotators' cam. The 2 Rs around the dial motor ensure
start up & decay speed are right to maintain about 50% duty power on cycle so
there is plenty of pulse width control to ensure the dial stays in step.
When the dial plate agrees with the control plate the home contact turns off
the power & the lamp goes out.
CALIBRATION
As it is possible to get this type of servo feedback out of step, a calibrate
button is provided underneath the controller. If the controller fails to power
off after rotating this usually means the rotator has reached its mechanical
stop & is not providing any more servo pulses. Pressing the Calibrate button
then runs on the dial motor to catch up so the controller powers off OK.
Calibration should not be done often (once/10mins?) as it applies much higher
voltage to the DC motor & heats up the 27ê & stalled rotator motor in the
rotator. Also the rotator motor itself is too hot to touch after doing this
just once!
MODS
As with other rotators the motor is well over run, so if more than 2 mins use
is needed add a high wattage R (80ê 10W) in series with neutral will increase
rotator motor run time before it overheats & burns out. This also reduces the
lamp power & increases it's lifetime.
Why Don't U send an interesting Bul?
73 de John G8MNY @ GB7CIP
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