Base Station Installation - Yaesu FT-1500M Operating Manual

cable lead to the NEGATIVE (–) terminal. If you need to extend the power cable, use #12 AWG or
larger insulated, stranded copper wire. Solder the splice connections carefully, and wrap the
connections thoroughly with insulating electrical tape.
ρ Before connecting the cable to the transceiver, verify the voltage and polarity of the voltage at the
transceiver end of the DC cable using a DC voltmeter. Now connect the transceiver to the DC cable.
Mobile Speakers
The optional SP-7 External Speaker includes its own swivel-type mounting bracket, and is available
from your Yaesu dealer.
Other external speakers may be used with the FT-1500M, if they present the specified 4-ohm
impedance and are capable of handling the 3.5 Watts of audio output supplied by the FT-1500M.

Base Station Installation

The FT-1500M is ideal for base station use as well as in mobile installations. The FT-1500M is
specifically designed to integrate into your station easily, using the information to follow as a
reference.
AC Power Supplies
Operation of the FT-1500M from an AC line requires a power source capable of providing at least 10
Amps continuously at 13.8 Volts DC. The FP-1023A, FP-1025A, and FP-1030A AC Power Supplies
are available from your Yaesu dealer to satisfy these requirements. Other well-regulated power
supplies may be used, as well, if they meet the above voltage and current specifications.
Use the DC power cable supplied with your transceiver for making power connections to the power
supply. Connect the RED power cable lead to the POSITIVE (+) power supply terminal, and connect
the BLACK power cable lead to the NEGATIVE (-) power supply terminal.
Packet Radio Terminal Node Controller (TNC)
The FT-1500M provides a convenient rear-panel DATA jack for easy connections to your TNC. This
connector is a standard mini-DIN connector.
The FT-1500M's DATA jack connections are optimized for the data transmission and reception speed
in use. In accordance with industry standards, the signal levels, impedances, and bandwidths are
significantly different on 9600 bps as opposed to 1200 bps. If your TNC does not provide multiple
lines to accommodate such optimization, you may still be able to utilize your TNC, if it is designed for
multiple-radio use, by connecting the TNC "Radio 1" port to the 1200 bps lines on the FT-1500M, and
the "Radio 2" port to the 9600 bps lines.
The pin connections of the Data connector are shown below.
Pin
1
2
3
4
5
6
Note that 9600 bps packet transmit-deviation adjustment is very critical to successful operation, and
can only be accomplished using a calibrated deviation meter (such as that found on an FM Service
Monitor used in a communications service center). In most cases, the Packet Data Input level (set via a
potentiometer inside the TNC) must be adjusted to provide a deviation of ±2.75 kHz (±0.25 kHz).
Check with your packet node' s sysop if you have any questions about the appropriate deviation level
for your network.
The setting of the 1200 bps Packet Data Input level is much less critical, and satisfactory adjustment
to the optimum (±2.5 ~ ±3.5 kHz) deviation can usually be done "by ear" by adjusting the TNC' s
1200 bps TX Audio Level potentiometer so that the outgoing packets (as monitored on a separate
VHF or UHF receiver) are approximately the same level as (A) the DTMF tones or (B) the 1750 Hz
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