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Shure T4 Diversity Receiver
Display Check
Test-Equipment Settings
Service Procedures
Presettings
Most field units should already be tuned closer to the desired settings than
these approximations. However, you may need to preset units when you are
changing the frequency or an
to retune them.
Minimum inductance occurs when the core is level with the top of the
can. Turning the core further counterclockwise or even removing it will
not appreciably affect the inductance.
Maximum inductance occurs when the core is about two turns less than
its full clockwise rotation—about 3.2 mm (
can. Never screw the core against the board.
The manufacturer's setting of the two smaller,
to their ideal setting, so you generally would not preset them. For coils L3–L8
and L12–L15, refer to Table 2 or 3 (page 10) to determine where the desired fre-
quency lies within the board's group. For frequencies near the bottom of a group,
use the maximum-inductance settings; for frequencies near the top of the group,
use the minimum-inductance settings.
1. Connect an external 12–15 Vdc supply to the dc input (J103). The green
"Power"
should glow.
LED
2. Check for 9 Vdc ("0.35) at
1. Plug into the
RF
to the pcb (antenna and ground). Set the generator's controls as follows:
S
–20 dBm on the receiver's operating frequency
S
"15 kHz
FM
2. Activate the 400 Hz high-pass and 30 kHz low-pass filters on the audio
analyzer.
12
coil, or when an unskilled person has attempted
RF
9 (pin 3 of voltage regulator U101).
TP
end of the 50 Ω cable you soldered
generator the
BNC
deviation with 1 kHz modulation
1
/
in.) below the top of the
8
coils (L2 and L11) is close
IF
25C1020
(EA)
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