Yaesu FT-2400H Technical Supplement page 63

INSTALLATION OF OPTIONS {FRC-6)
FRC-6 DTMF Pager Installation
&
Alignment
The FRC-6 provides
DTMF
tures using 3-digit
code memories store your ID code plus those of six
frequently-called stations or groups. Control is
provided through the front panel of the transcei­
FT-2400H Operating Manual
ver. See the
tional details.
0 Disconnect the DC power cable, and referring to
Figure 1, remove the four screws affixing the top
cover (two on either side), and loosen the one on
top from the back by several turns. Lift the rear
edge of the cover slightly, then remove it.
0 Referring to Figure 2, note the accessory mount­
ing location for the FRC-6 over the larger of the
two empty white connectors.
0 Carefully align the pins on the FRC-6 with the
connector, and press it into place.
0 The factory adjusts the output tone level (the
small trimmer accessible through the FRC-6
board) for the proper deviation, so it should
Figure 1
DTMF
paging/ selcall fea­
ID
station codes. Seven
for opera­
require no further adjustment. The alignment
procedure is listed below, however, if needed.
0 Replace the top cover and four screws removed
in the first step, and remember to tighten the
screw at the back of the top panel from the rear.
Alignment
0 Select 20-kHz tuning steps on the transceiver N: P '
F
/W�
(press
kHz displayed steps, and press
D Connect the test equipment as shown on the
following page, and temporarily connect a 4.7-
kilohm resistor between pins 7 and 12 on the
installed FRC-6, as shown below (this causes a
DTMF tone to be emitted continuously).
0 Adjust VR101 on the FRC-6 for ± 3.5 to 4.7 kHz
deviation during transmission, with no micro­
phone input.
D Set the AF genera tor for 50 m V output at 1 kHz,
and adjust trimmer potentiometer VR3001 for ±
4.8 kHz deviation during transmission.
FRC-6
Mounting Location
turn the selector knob for 20-
:/:P
again).
Figure 2