User's Manual

GBI Antenna Controller User Manual Ver. 1.00
Antenna Tuning
P/N 1100031 page c
6) Turn the
Antenna matching capacitor
clockwise (
CW
) to reduce the
reading by 10mV to 15 mV (i.e. if the maximum reading was 120mV, the
final reading should be 105mV to 110mV).
7) Slowly move a metallic object close to the
Antenna
assembly (up to 2 cm
from the
Antenna
). The reading should rise slightly towards the
maximum
before it drops, when the metallic object is placed very close to the
Antenna
assembly.
Note: If the reading does not rise, but only drops, readjust CCW to reduce
reading by 10 - 15mV, then re-check with a metallic object.
3.4 Antenna Tuning Final Check and Assembly
At the completion of the procedures in Section 5-3, perform the following procedures:
1) Return all SL jumpers to MT position.
2) Check Antenna operation with a card.
3) Cover and seal
Antenna matching capacitor
tuning opening with special
non-corrosive RTV (“Rotacil 1112”, or equivalent).
3.5 Procedure for Choosing Coil - Ls
- Refer to section 1.1 for connector and jumper positions on card.
1) Connect a 50
Ω
resistor, to simulate antenna load, by applying a jumper to
the selected transmitter.
(
J1
- Xmtr. #1,
J2 -
Xmtr. #2,
J16 -
Xmtr. #3 or
J19 -
Xmtr. #4).
2) Remove the
SL
jumper of the selected transmitter (for constant RF
transmission) and place all other
SL
jumpers in
OFF
position
3) Connect DVM to connector
P5
.
4) Apply power to card and register the DVM reading.
5) Remove 50
Ω
resistor jumper (see step #1) and connect the selected antenna
cable to the selected antenna terminal block.
6) Perform antenna-tuning procedure. (Refer to section 1.1).
7) If DVM reading
at maximum
point is lower by more than 10 mv with
antenna than with 50
Ω
resistor, replace
Coil Ls
with one of the next lower
value .(i.e. 3.9
µ
H
→
3.3
µ
H )
8) If DVM reading at
maximum point
is higher by more than 40 MV with
antenna than with 50
Ω
resistor, replace
Coil Ls
with one of the next higher
value. (i.e. 3.9
µ
H
→
4.7
µ
H )
9) After replacing
Coil Ls
, repeat procedure from step 6.
10) Return all
SL
jumpers to
MT
position.