Communications Specialists TS-64WDS, Installation Instructions

Page: 4 / 4

3.0 INSTALLATION INSTRUCTIONS
Installation if the TS-64WDS should be done by a qualified two-way radio technician. When
installing the TS-64WDS be careful not to twist or bend the printed circuit board as this can dam-
age the surface mount components. In addition, use static protection techniques while handling
the unit. Be sure that all power is removed before installing or programming the TS-64WDS. The
following paragraphs describe each of the external connections on the TS-64WDS.
+VOLTAGE (RED) (Pin 3)
This wire should be connected directly to a filtered source of continuous positive DC voltage in
the range of +6.0VDC to +20.0VDC. This connection should be made ”downstream” from the
power switch, and the power supply filter components in the radio set. If a regulated source of DC
voltage is available, it may be used. Using a quiet and stable source of DC voltage inside the
radio set will reduce the possibility of picking up power supply noise.
GROUND (BLACK) (Pin 9)
The Ground wire should be connected to a location inside the radio set which will supply a DC
power ground return to the TS-64WDS. To eliminate ground loops and power supply noise, the
ground return to the TS-64WDS should be the same power supply ground used in the transmit or
receive audio stages.
PTT INPUT (ORANGE / WHITE) (Pin 4) THIS LEAD MUST BE GROUNDED TO ENCODE
TONE
PTT OUTPUT (YELLOW / BLACK) (Pin 10)
The PTT Input detects a transmit condition by sensing a ‘pull to ground’ on the PTT line of the
radio set. This information is used by the TS-64WDS to determine transmit status. The PTT
Output line is a FET that pulls to ground to key the transmitter during CTCSS transmission.
To Install the PTT Input and PTT Output lines, cut the PTT line in the radio set at the microphone
connector, and insert the PTT Input and PTT Output on the TS-64WDS in series with the trans-
mitter’s PTT line. The TS-64WDS will now control the transmit PTT line.
As an alternative to simplify the installation, the PTT Input line on the TS-64WDS may be perma-
nently grounded, and the PTT Output line can be left unconnected. This will enable the TS-
64WDS encoder at all times. If this arrangement is used, be sure that the Transmit Time-out-
timer on the TS-64WDS is disabled. A reverse phase burst will of course not be sent.
CTCSS OUTPUT (YELLOW) (Pin 6)
This output generates the CTCSS encode tone. The most common place to connect this line is
just prior to the modulation stage in the transmitter. Typical connections would be to the center of
the deviation pot, to the varactor diode in the modulator circuit, or to the manufacturer’s sug-
gested connection point. This connection point can vary from radio to radio. Do not connect the
CTCSS Output to the microphone input as the microphone audio stages will distort and attenuate
the CTCSS signal.
Since the CTCSS Output on the TS-64WDS is low impedance, you may have to install a series
resistor to reduce the loading effects of the CTCSS Output depending on the interface imped-
ance. This is evident in the case of connecting to the center of a 100K deviation pot. In this case,
a 100K series resistor will compensate for the impedance difference. In addition, a slight adjust-
ment of the voice deviation may be required to compensate for the CTCSS Output circuit loading.
RX MUTE OUTPUT #1 (GREEN / WHITE) (Pin 13)
This output is a FET that pulls to ground when not decoding to mute receive audio. The RX Mute
Output #1 is usually connected to the collector of the ‘squelch switch transistor’ in the receiver.
To find the correct connection point for RX Mute Output #1, locate a point in the receiver squelch
circuit that will ‘mute’ the receiver audio upon application of a ground potential. This will be the
correct point for connection. If you choose this option, leave RX Mute Output #2 disconnected.
RX MUTE OUTPUT #2 (BROWN) (Pin 7)
This output is also a FET that is the reverse of Rx Mute Output #1 and pulls to ground when
decoding to mute receive audio. To find the correct connection point for RX Mute Output #2,
locate a point in the receiver squelch circuit that will “open” the receiver audio upon application of
a ground potential. This will be the correct point for connection. If you choose this option, leave
RX Mute Output #1 disconnected.
DISCRIMINATOR INPUT (GREEN) (Pin 12)
This wire feeds the CTCSS decoder in the TS-64WDS. This connection MUST be made directly
to the receiver discriminator output in the receiver. Please note that many discriminator circuits
have a low pass filter on the discriminator output that consists of a small inductor and a capacitor.
This filter network is used to attenuate very high frequency components. In the case where this
network is used, the TS-64WDS Discriminator Input should be connected AFTER this network.
Connecting the Discriminator Input after any audio processing circuitry in the receiver may distort
and attenuate the CTCSS signal and produce unreliable decoding.
HIGH PASS FILTER INPUT (BLUE / WHITE) (Pin 1)
This wire feeds audio to the input of the High Pass Audio Filter. It is normally connected to the
discriminator at the same point as the Discriminator Input above (green wire, Pin 12)
HIGH PASS FILTER OUTPUT (BLUE) (Pin 11)
The High Pass Filter Output removes the CTCSS signal from the receiver discriminator audio so
that the operator will not hear it. In many cases, the audio response of the receiver will not pass
the CTCSS signal, and the High Pass Filter on the TS-64WDS will not be required. In those
cases where the High Pass Filter must be utilized, break the discriminator audio path in the
receiver just after the point where the TS-64WDS Discriminator Input was connected. Then
install the High Pass Filter Output so that it is in series with the audio path in the receiver.
HIGH PASS FILTER MUTE (BROWN / BLACK) (Pin 8)
If this wire is shorted to ground, any audio flowing through the High Pass Audio Filter will be
muted. Normally this is not used, however if you are using the High Pass Audio Filter, you may
connect this wire to RX MUTE OUTPUT #1 to allow receive audio when the TS-64WDS is de-
coding the proper tone or the microphone hang-up is off hook.
MICROPHONE HANG-UP/BUSY INPUT (VIOLET) (Pin 2)
This is a dual function input that is determined by the H/B jumper pad. When the H/B jumper pad
has no “solder bridge” across it, this input will operate as a Microphone hang-up input, and
control the ‘channel monitoring’ function in the TS-64WDS. When the Hang-up Input is floating or
above ground potential (mic is off-hook), the TS-64WDS will be in the monitor mode, and will
unmute the receiver audio. If this input is grounded, such as through a mic hang-up button, the
receiver audio will be muted. The audio path in the receiver will only be enabled upon receipt of
the correct CTCSS code. Connect the Hang-up Input to the microphone hookswitch connection
on the microphone jack.
If the H/B jumper pad has a “solder bridge” across it, the Hang-up/Busy Input will operate as a
Busy Input, and disable the transmit function in the TS-64WDS if the operator tries to transmit
when the channel is busy. However, if the TS-64WDS is currently decoding a CTCSS tone, and
the channel is busy, the transmit function will be allowed. Connect the Busy Input to a location in
the receiver that will provide an indication as to the status of the channel. The usual location is
the squelch switch transistor in the receiver. A busy channel is defined as a logic high, or a
voltage level greater that 1.5VDC. Please note that this is the same connection point as the RX
Mute Output. The Busy Input must be connected AHEAD of the RX Mute Output with a diode in
series, and the cathode of the diode connected to the Busy Input. This arrangement will isolate
the Busy Input from being controlled by the Receive Audio Mute Output.
ALERT TONE OUTPUT (ORANGE / BLACK) (Pin 5)
The Alert Tone Output (Busy Tone Output) generates a busy tone under two conditions. First, if
the programmed interval for the Transmit Time-out-timer is exceeded, the Busy Tone Output will
generate the busy tone until the microphone PTT switch is released. Second, if the Hang-up/
Busy Input is configured for Busy operation and the PTT switch is pressed while the channel is
busy, the Busy Tone Output will generate the busy tone until the microphone PTT switch is
released.
This Output can be connected to the input of the audio amplifier stage in the receiver. The busy
tone will then be heard in the speaker of the radio set.
3.1 ADUSTMENT
The CTCSS Output Adjustment, VR-1, is the only adjustment required on the TS-64WDS. This
control sets the level of the CTCSS Output. A very small slotted alignment tool should be used to
make the adjustment on the TS-64WDS PCB. To adjust the CTCSS Output level to the correct
deviation, key the PTT switch on the microphone, and while watching a deviation scope tuned to
the transmit output frequency, carefully adjust the CTCSS Output Adjustment. The deviation
level of the CTCSS Output should be set to 0.5kHz for wide-band or 0.25kHz or less for narrow-
band.
A deviation scope on a service monitor is best for adjusting the CTCSS deviation. The CTCSS
waveform on the scope will appear as a sine wave. If the CTCSS signal appears distorted, this
indicates that the interface connection is incorrect, and must be changed to a more suitable
location.
4.0 SPECIFICATIONS
Number of Tones
Tone Accuracy
Tone Stability
Encode Output Z
Encode Output Level
Discriminator Input Z
Decode Input Level
Signal to Noise
Decode Time
Fade Time
Squelch Tail Elimination
CTCSS Tone Programming
RX Mute Outputs
TX PTT Output
Receive Audio Filter
Busy Tone Output
Temperature Range
Supply Requirements
Size
64
Better than 0.05Hz
Crystal controlled
2.2K ohms AC coupled
Adjustable from 0v to 3.0V
60K ohms AC coupled
5 Mv minimum
Better than 4dB Sinad
150 ms. Nominal
350 ms. Nominal
160 ms reverse phase burst
By 6 position dip switch
FETs
FET
3 pole 330Hz High-pass filter
5V pk-pk at 1000Hz
-30°C to + 65°C
6.0 to 20.0 VDC @11 Ma.
0.9” x 1.8” x 0.19”
REV.
04
1
718JM