©1996 Hamtronics, Inc.; Hilton NY; USA. All rights reserved. Hamtronics is a registered trademark. Revised: 1/19/00
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strap and a grounded solde ring iron.
b. Resistors and diodes mounted
vertically are shown with the body of
the re sistor designated by a circle.
c. Observe polarity on electrolytic
capacitors, diodes, transistor, and ic.
d. With modern CAD-produced pc
boards, pad sizes are smaller than
what you may be used to. Because the
board has plated-through holes, it is
the solder inside the hole, and not on
the pad, which makes the electrical
connection.
Use solder sparingly. It helps to
use a small soldering tip and a mini-
mal amount of small-diameter solder.
It also helps to work under a magni-
fier lamp if you have one, especially
for the ic.
e. Note that there is one hole in
the board next to the crystal which
has no lead soldered to it. This is a
"via", which carries ground through to
pin 11 of the ic on the bottom of the
board. There are also many holes
which are used as terminals for con-
nection to the outside world, many of
which are optional and may not be
used in your application. And you will
note that holes connected to the
ground plane are "thermals", a special
pattern which allows connection but
minimizes heatsinking to make sol-
dering and unsoldering easier.
CONSTRUCTION SEQUENCE.
a. The ic is soldered to the bottom
of the board with pin 1, identified by a
dot in the plastic mold, toward R6 and
the leads for the crystal. That would
be the left end of the board as shown
in figure 2. Make sure you have it ori-
ented correctly before soldering.
Begin by tack soldering one corner
and readjusting until all the leads line
up properly with the tracks. Double
check that you have pin 1 connected
to the trace running to U2 and C3.
Then, tack solder the opposite corner
lead. Finally, solder all the other
leads. If you accidentally get solder
between two leads, drawing the iron
between them away from the ic should
separate the two pads. If necessary,
use desoldering tool or wick to remove
excess solder.
b. Turn the board over and orient
as shown in the two top views.
c. Install crystal over ground
plane as shown, and solder leads to
pads under board. Lay crystal flat
against ground plane, and tack solder
the top of the can to the ground plane
with a small bead of solder. This will
be at the right hand side of the crystal
can as shown in the top view, and it
will hold the crystal securely in place.
d. Install the DIP switch with the
levers along the top edge of the board,
as shown in the artist rendering at the
beginning of the manual. Solder all
leads under board.
e. Install potentiometer R2 as
shown and solder leads.
f.
Solder voltage regulator U2
and transistor Q1, with proper orie n-
tation.
g. Install electrolytic capa citors,
observing polarity.
h. Install the other (ceramic and
monolithic) capacitors.
i.
Install resistors and diodes,
observing diode polarity. See detail of
diodes next to top view.
j.
Check over construction to be
sure all parts are installed in the
proper holes with the proper polarity.
Check all solder joints for bad joints,
solder splashes, etc.
INSTALLATION.
GENERAL.
Installation consists of mounting
the module, selecting the tone fre-
quency, providing power, and making
connections to the required circuits in
the radio equipment. The latter in-
formation is divided into two major
sections: transceiver installation and
repeater installation; choose which-
ever applies.
MOUNTING.
The TD-5 module is de signed to be
mounted to the side wall of a radio
chassis with the pot and DIP switch at
the top for easy access, just below the
upper edge of the box. To locate the
mounting holes, draw a line one inch
below the top of the box. Then, mark
the two mounting holes 1-7/8 inches
apart on the line. Attach the module
with 4-40 screws and standoffs or
spacers as desired.
The usual location for the TD-5
module used with the receiver in a
Hamtronics REP-200 Repeater is on
the rear panel of the enclosure near
the receive coax connector. This is
convenient for connections to the
feedthrough capacitors on the parti-
tion, and it allows easy access to the
pot and switch for adjustment.
For transmit operation, the TD-5
usually is mounted in the exciter
compartment, on the shield just to the
right of the exciter. In many trans-
ceivers, you will probably be forced to
find any practical space where the
module will fit; you may even have to
mount it in a mini-box attached to the
rear of the radio.
SELECTING CTCSS FREQUENCY.
The tone frequency is selected by
grounding binary control lines (see D0
thru D5 on schematic diagram). The
ic has pullup resistors; so ground = lo
logic level and open circuit = hi. Table
1 shows the pattern of logic signals
required for each tone frequency.
DIP Switch Method.
If you only need one tone, you can
select it with the DIP switch on the
module. Set the six switch levers ac-
cording to the logic levels indicated for
the desired tone frequency in Table 1.
Open on the switch is logic 1 (hi) and
closed is logic 0 (lo).
Front Panel Switch Method.
If you need several tones, for use
in a transceiver to access several re-
peaters, you can set up a front panel
switch to select between preset tones.
To do so, you must remove the DIP
Table 1. DIP Switch Programming
Switch Pos
Õ
Õ
1
2
3
4
5
6
67.0 Hz
1
1
1
1
1
1
69.3 Hz
1
0
0
1
1
1
71.9 Hz
1
1
1
1
1
0
74.4 Hz
0
1
1
1
1
1
77.0 Hz
1
1
1
1
0
0
79.7 Hz
1
0
1
1
1
1
82.5 Hz
0
1
1
1
1
0
85.4 Hz
0
0
1
1
1
1
88.5 Hz
0
1
1
1
0
0
91.5 Hz
1
1
0
1
1
1
94.8 Hz
1
0
1
1
1
0
97.4 Hz
0
1
0
1
1
1
100.0 Hz
1
0
1
1
0
0
103.5 Hz
0
0
1
1
1
0
107.2 Hz
0
0
1
1
0
0
110.9 Hz
1
1
0
1
1
0
114.8 Hz
1
1
0
1
0
0
118.8 Hz
0
1
0
1
1
0
123.0 Hz
0
1
0
1
0
0
127.3 Hz
1
0
0
1
1
0
131.8 Hz
1
0
0
1
0
0
136.5 Hz
0
0
0
1
1
0
141.3 Hz
0
0
0
1
0
0
146.2 Hz
1
1
1
0
1
0
151.4 Hz
1
1
1
0
0
0
156.7 Hz
0
1
1
0
1
0
159.8 Hz
1
0
0
0
1
1
162.2 Hz
0
1
1
0
0
0
167.9 Hz
1
0
1
0
1
0
173.8 Hz
1
0
1
0
0
0
179.9 Hz
0
0
1
0
1
0
183.5 Hz
0
1
0
0
1
1
186.2 Hz
0
0
1
0
0
0
189.9 Hz
1
1
0
0
1
1
192.8 Hz
1
1
0
0
1
0
196.6 Hz
0
0
1
0
1
1
199.5 Hz
1
0
1
0
1
1
203.5 Hz
1
1
0
0
0
0
206.5 Hz
0
1
1
0
1
1
210.7 Hz
0
1
0
0
1
0
218.1 Hz
0
1
0
0
0
0
225.7 Hz
1
0
0
0
1
0
229.1 Hz
1
1
1
0
1
1
233.6 Hz
1
0
0
0
0
0
241.8 Hz
0
0
0
0
1
0
250.3 Hz
0
0
0
0
0
0
254.1 Hz
0
0
0
1
1
1
