Yaesu FT-223 Instruction Manual page 27

1. Ordering Crystals: The crystals used in your FT-223 are
manufactured to extremely close tolerance to match the
electrical characteristics of the oscillator circuits. It is
recommended that whenever you wish to install additional
crystals in the transceiver, you should obtain these from
your dealer to assure proper functioning of the circuitry
under varying environmental conditions.
Crystal Specification
TYPE
Frequency MHz
Tolerance
Parallel Capacitance
Drive Level
Effective Resistance
Receiver
HC-25/U
RX Freq - 10. 7
9
+20 PPM
30 PF
10 mW
less than
20 ohms
Transmitter
HC-25/U
TX Freq
12
+20 PPM
30 PF
SmW
less than
20 ohms
2. Installing Additional Channels: To install additional channels
in your FT-223, proceed as follows:
(a) Remove the 8 screws on the side of the cases and lift
the cases out of the transceiver.
(b) Install the new crystals in their appropriate sockets on
the transmitter and receiver circuit boards.
Figure 13
Figure 14
- 25 -
TC 301
TC 302
TC3u
T C313
TC 314
TC,,
3
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