Hal communications Id-1a User manual

HAL COMMUNICATIONS

CORR

BOX

365

URBANA, ILLINOIS 61801

QUALITY COMMUNICATIONS EQUIPMENT

*************************************************

WARRANTY

HAL

Communications Corp. warrants

that

the

HAL

I

D-1

A

Re-

peater Identifier shall

be

free

of

defects in materials and work-

manship under normal

use

and service

for

a period

of

one year

from

the date

of

the original invoice. Should such defects

occur

within

the warranty period, the identifier

will

be

re-

paired at no charge except

for

transportation costs upon

re-

turn

of

the

unit

to

the factory. Units returned

for

warranty

service must

be

postmarked

within

one year

from

the begin-

ning

of

the warranty period.

This warranty

is

and shall

be

in lieu

of

all other warranties,

whether expressed

or

implied, and

of

all other obligations

or

liabilities on the part

of

HAL

Communications Corp. resulting

from

the installation

or

use

of

this identifier.

The foregoing warranty

is

completely void on all units which

have

been

repaired

by

individuals other than

HAL

Communi-

cations Corp. personnel, those which

have

been

damaged,

abused, modified, improperly installed,

or

tampered

with,

and

those which

have

been subjected

to

improper voltages

or

currents.

*************************************************

Copyright

@

1972

by

HAL

Communications Corp.,

Urbana, Illinois. Printed in the United States

of

America.

All

rights reserved. Contents

of

this publication may

not

be

reproduced in any

form

without

the

written

permission

of

the copyright owner.

CONTENTS

I. Description

.................

.

............

.

.........

1

.

....

3

II.

Installation

.................

. .

....

7

Ill.

Test Procedure

...........

.

.........

.

....

8

IV.

Programming the Memory

.............

.

V. Theory

of

Operation . . . . . . . . . . . . . . .

........

12

VI.

Parts List

................................................

18

TABLES AND ILLUSTRATIONS

................

.

.........

8

..........

9

Table 1: Character Codes

...............

.

Table 2: Coding the Memory

for

"DE

WB9XYZ"

................

Figure 1: ID-1A Circuit Board Layout

..................................

4

Figure 2: Coding Chart

for

"DE

WB9XYZ"

..............................

11

Figure 3: Blank Coding Chart

......................................

11

Figure 4: Generating a

Dot

........................................

15

Figure 5: Generating a

Dash

. . . . . . .

..............................

15

Figure 6:

ID-1A

Schematic Diagram

...................................

17

I. DESCRIPTION

The

HAL

Communications Corp. I

D-1

A repeater identifier

is

designed

to

help owners

of

repeater

stations meet

FCC

requirements

for

periodic station identification.

It

automatically transmits the

station call sign at the required intervals whenever the repeater

is

in

use.

The I

D-1

A offers

these

advanced features:

•

TTL

integrated circuits

for

high noise

immunity

and wide operating temperature range

• Reprogrammable diode-matrix read-only memory

for

storage

of

the station call

sign

• Accurate interval

timing

derived

from

the AC power line

• Interval

timing

source

for

emergency

or

portable operation

from

DC

power

• Transistor switch

for

direct

control

of

the repeater keying relay

•

Page

control

input

to

inhibit

identification during paging tones

• Adjustable code

speed

• Low-impedance audio

output

with

adjustments

for

pitch and volume

• Regulated 5

volt

DC

power supply

•

Rugged

G-10 epoxy-glass

circuit

board

Operation

The I

D-1

A identifier

is

completely automatic.

It

senses

when the repeater

has

been actuated

and

immediately transmits the station call sign

by

feeding a keyed audio tone

to

the repeater trans-

mitter.

After

this initial identification

has

been sent, a short

"guard"

period commences.

At

the

same

time,

a three-minute

timing

interval starts.1

If

the repeater

is

again

keyed up during the guard period,

but

remains inactive during the nominal three-minute

timing

interval,

only

the initial identification

is

transmitted. This feature prevents the unnecessary repetition

of

the call

sign

if

the repeater

is

trig-

gered

briefly

by a noise burst

or

by

a short call

to

which there

is

no response.

If,

however, the repeater

is

reactivated after the guard period

but

before the

end

of

the timing

interval, the identifier

will

repeat the call sign

at

the end

of

the longer interval. The identification

will

be

transmitted approximately every three minutes

as

long

as

the repeater

is

activated once

during

each

interval.

If

the repeater

is

held continuously activated, the I

D-1

A

will

identify

at three

minute intervals.

If

the repeater happens

to

be

off

the air

at

the moment the identification

is

to

be

transmitted, a keying transistor

in

the I

D-1

A actuates the repeater keying relay, returning the trans-

mitter

to

the air while the call sign

is

being sent.

Identification may

be

inhibited

by

grounding the

page

control input.

If

this line

is

grounded when

the

timing

interval ends, identification will be delayed

until

the control line

is

released.

Circuit

Description

The identification

message

is

stored in a diode-matrix read-only memory (ROM). This memory

has

been

specially designed

to

store code characters (dots,

dashes,

or

spaces)

using a

minimum

number

of

diodes. The memory capacity

is

sufficient

to

store the letters

"DE"

plus any amateur call

sign.

1Timing intervals

of

approximately 6, 12,

or

24

minutes may also

be

selected

by

changing the position

of

ajumper

on the

circuit

board,

as

shown in the schematic diagram. The guard period remains the

same.

1

r On the

average,

the number

of

diodes

needed·

to

store a given

message

is

equal

to

about

two

thirds

of

the number

of

characters the

message

contains. £

Unlike many commercially available ROM's, the memory

used

in the I

D-1

A may

be

reprogrammed

by the user. The stored

message

can

be

changed

by

rearranging the diodes in the matrix. Complete

instructions

for

reprogramming the memory

are

given in section

IV

of

this manual.

Timing

for

the identifier

is

derived

from

the AC power line frequency and

is

therefore very stable

and

needs

no adjustment. A

series

of

integrated-circuit flip-flops divide the power frequency by a

factor

of

10,240

to

provide a basic

timing

interval

of

2 minutes, 50.7, sufficiently close

to

the

desired three-minute

timing

interval. As described on

page

12, the timing interval may

be

changed

to

2, 4

or

8 times the basic

timing

interval

if

desired. A

60Hz

unijunction oscillator

is

also

provided

to

supply a

time

source during D.C. operation.

Each

time

the identification

message

is

transmitted, the memory

is

read

out, one character at a

time. The memory

output

is

supplied

to

a character generator, which reconstructs the code charac-

ters

with

precise weight and spacing. The code

speed

may

be

adjusted

by

a potentiometer mounted

on the

circuit

board.

The character generator keys the audio oscillator, which supplies the audio signal

to

the repeater's

microphone line and

to

an

internal

monitor

speaker.

A

rugged

transistor switch

is

built

into

the ID-1A

to

activate the transmitter control relay. The

transistor

is

rated

to

handle

±25

volts

at

500

rna.

A high-voltage transistor switch, rated

to

carry

150

rna.

at

+250

volts

or

-150 volts

is

available

as

an

option. The normal high-current switch

is

recommended

if

you plan

to

control the repeater's push-to-talk relay.

All

ID-1A

circuitry,

including the regulated 5

volt

power supply,

is

contained on a 3 x

6"

circuit

board. The power transformer, fuseholder, test switches, connectors and bypass capacitors

are

mounted external

to

the board.

The I

D-1

is

available assembled in

1~"

high

by

4"

deep rack-mounted

(19''

wide) cabinet, or

is

available

as

an

assembled, tested

circuit

board ready

for

mounting and shielding.

2

c

II.

INSTALLATION

OF

ASSEMBLED

CIRCUIT

BOARD

Mounting and Wiring ,

Since the

ID-1A

circuit

board

is

supplied wired and tested,

it

is

necessary

only

to

mount

the board

and

the

external components in a suitable enclosure, such

as

a

HAL

cabinet

or

a Bud

Minibox,

and

to

connect the

identifier

to

the

repeater transmitter.

Figure 1 shows the

circuit

board and

the

terminals

to

which the

following

external components

are

connected:

1.

Power transformer (including

primary

circuit

wiring)

2.

Fuseholder

3. Speaker

4.

Audio

output

connector (phono jack)

5. Keyed

output

jack (%" phone jack)

6.

Keyed

input

jack (phono jack)

7.

Page

control

jack (phono jack)

8.

DC

voltage

input

(phono jack)

9. Test switches A and B

The power transformer secondaries should

be

wired in parallel

to

provide 6.3 volts. The

two

pri-

maries should be connected

in

parallel

for

115 VAC operation,

or

in series

for

230 VAC operation.

Be

certain

to

observe the

polarity

of

the leads when connecting the windings in series

or

parallel. A

terminal strip

is

provided

for

the

wiring

of

the transformer primary

circuit,

which includes the trans-

former

leads, the fuseholder,

the

power cord, and the line bypass capacitors. Bypass each side

of

the

power line

to

the cabinet

with

the .001

ufd

capacitors provided. Connect the power cord ground

conductor securely

to,the

cabinet.

The two-inch speaker provided

for

monitoring

and testing the I

D-1

can

be

mounted most con-

veniently

by

simply gluing

it

to

one side

of

the cabinet. Scotch spray adhesive, Elmer's

white

glue,

or some similar cement

is

adequate.

The

input

and

output

jacks,

as

well

as

the

test switches, may be mounted

at

any convenient location

on

the

cabinet and connected

to

the

circuit

board

as

shown in Figure

1.

The keyed

input

jack

(a

phono connector) carries

the

signal

which

triggers

the

I

D-1

A whenever the repeater

goes

on

the

air.

Grounding

the

center contact

of

this jack activates the identifier. The jack may

be

connected

to

any

unused contacts which close when

the

repeater

is

keyed up. Connect a

0.1

ufd

capacitor across the

jack terminals

to

prevent noise pulses

from

activating

the

I

D-1

A.

Test switch B

is

also connected across

the

keyed

input

jack. Depressing this switch

has

the

same

effect

as

keying up

the

repeater.

It

is therefore useful in testing the identifier. Permenantly closing

this switch (grounding

the

keyed

input

jack)

will

cause

the I

D-1

A

to

identify

at

the end

of

each

timing

interval.

The keyed

output

jack

is

used

to

connect

an

external transmitter

control

relay

to

the transistor

switch in

the

I

D-1

A,

allowing

the

identifier

to

activate the transmitter when

an

identification

is

to

be

sent. When

the

switching transistor conducts,

it

grounds the center conductor

of

the jack. The

transistor can switch either positive

or

negative voltages, depending on

the

way the

output

jack

is

wired

to

the

circuit

board

(see

Figure 1). Bypass the jack terminals

with

the

.01

ufd

capacitor

supplied.

3

o::t

r- -

...

~

-

"'

Timer Length

Strap

Fig.l

Component

Layout

~

·

-Speaker

HAL Communications

10-lA

Identifier

The transistor switch

is

rated

at

±._25

volts and

500

rna., which

is

adequate

to

switch push-to-talk

relays operating from a 12 volt

DC

source. If

your

repeater uses a 6 volt relay, be sure

that

it draws

-less

than

500

rna. before connecting it

to

the

ID-1A.

Connect

the

clamping diode provided across

the

terminals

of

any

relay switched

by

the

I

D-1

A.

This

diode eliminates

the

switching spike generated when

the

relay

current

is

interrupted. Without

the

diode

the

spike voltage may damage

the

switching transistor. The diode should be connected with

its cathode toward

the

positive end

of

the

relay coil so

that

it

is

normally nonconducting.

The keyed audio

output

is

fed

to

the

transmitter through a phono connector. The relatively low

impedance

of

the

output

terminals permits driving

the

microphone lines

of

most transmitters

di-

rectly. Bypass

the

audio

output

terminals

at

the

jack with a

.01

ufd capacitor.

Test switch A

is

provided for bench testing

of

the

I

D-1

A. It causes

the

coded message

to

be gen-

erated each

time

it

is

pushed, whether

or

not

a complete timing interval has passed. Repeated clo-

sures

of

this switch (or

contact

bounce) may cause errors

in

the

transmitted message. Use

the

switch

for off-the-air testing only;

do

not

make

any

external connections

to

the

switch contacts.

The page control input can be used

to

ensure

that

no identification will be sent during a paging call.

If

the

end

of

the

timing interval

is

reached when

the

page control line

is

grounded,

the

identification

will be delayed until

the

line

is

released. The state

of

this control line does

not

affect

the

internal

timer. If

the

line

is

used, bypass it with a

.01

ufd capacitor.

Typical Installations

The ID-1A incorporates many features,

not

all

of

which need be used

in

a particular application.

To

help in planning an installation, here are

two

typical examples:

Situation

A:

An

amateur

-band repeater

is

to

be identified

at

the

required three-minute intervals.

The push-to-talk relay

in

the

transmitter

is

controlled

by

an

output

from

the

receiver. One end of

the

relay coil

is

connected

to

a +12v

DC

source capable

of

supplying

the

200

rna

needed

to

activate

the

relay.

The

identifier

is

to

be operated from a 12v

DC

source.

The

page control feature

is

not

needed.

Procedure:

1.

Set

the

timer for

the

three-minute interval

by

connecting

the

jumper

to

the

three-

minute position (3)

on

the

PC

board.

2. Strap

the

timer

input

to

the

internal clock (I).

3. Supply 12v

DC

to

the

unregulated supply input through a 15 ohm, 5

watt

resistor.

Leave

the

power transformer unconnected.

4. Locate an unused

contact

pair

on

the

receiver relay. Connect

the

keyed input line

to

one

contact; ground

the

other

contact.

5. Connect

the

emitter

of

the

transistor switch

to

ground. Connect

the

collector

to

the

low side

of

the

push-to-talk relay. Wire

the

damping diode across

the

relay coil, with

its cathode toward

the

positive end

of

the

coil.

6. Couple

the

audio signal

to

the

transmitter audio

input

circuitry.

7. Connect

the

speaker and

test

switches as described

in

the

preceding section.

8. Leave

the

page control input unconnected.

5

Situation 8: A commercial repeater for handling messages

is

to

be identified every

24

minutes

re-

gardless

of

how often

the

repeater

is

activated. However,

if

the

receiver

is

active and a message

is

C''

being sent, transmission

of

the

call sign

is

to

be delayed until

the

message has been completed. The

~

identifier

is

to

operate from a 120v

AC

power source. The transmitter

is

controlled by a 12v

DC,

200

rna

relay.

Procedure:

1.

Use

the

normal 120v Ac connections

to

supply power

to

the

I

D-1

A.

2.

To

provide continuous operation, ground

the

key line.

3. Set

the

timer for a 24-minute interval by inserting

the

jumper wire

in

the

proper

hole (24)

on

the

PC

board.

4. Strap

the

timer input

to

use

the

AC

line (L)

as

its timing source.

5. Connect

the

transmitter relay as described

in

step 5

of

the

previous example.

6.

In

the

receiver, locate

the

relay which closes when messages are being received. Con-

nect

the

page control line

to

an unused contact; ground

the

other

contact

of

the

pair

so

that

the

page control line will be grounded when

the

relay

is

closed.

7. Connect

the

speaker, audio

output,

and test switches as described previously.

Adjustments

The ID-1A requires only three simple adjustments before it

is

put

into operation.

The code speed

is

adjusted by

the

speed control. For checking

the

speed,

press switch A

to

start

the

coded message.

~

The audio

level

is

controlled by

the

volume adjust pot.

The

tone

control adjusts

the

oscillator pitch.

Again, test switch A

is

convenient for checking

the

settings.

The power supply voltage and

the

internal timing oscillator are set prior

to

shipment, and should

not

require adjustment.

If

adjustment becomes necessary, refer

to

the component layout for

the

location

of

the

controls and measurement points.

6

~

Ill.

TEST

PROCEDURE

•

If

you should

have

difficulty

with

your

ID-1A, you

can

check its performance

by

conducting the

following tests:

1.

Apply

AC

power

to

the identifier and check the regulated

DC

voltage at the emit-

ter

of

the regulator

pass

transistor (the

MJ

E521).

It

should

be

between +4.7 and

+5.1 volts.

If

it

is

not, adjust the power supply voltage control.

If

you cannot bring

the voltage

within

these limits, check

for

defective components in the power supply.

2.

If

the power supply voltage

is

correct,

push

test switch A. The speaker should emit

the coded identification

message

immediately.

It

should

be

possible

to

adjust the

code

speed,

the audio tone, and the volume

with

the appropriate controls.

If

the

identifier emits a very short, fast burst

of

code characters, check the 47 ufd capaci-

tor

in the master clock circuit.

3.

If

the above steps

have

not

isolated the problem,

press

test switch A again.

After

the

coded

message

has

been

emitted, wait

until

about half

of

the time interval

has

elapsed. Then push test switch

B.

After

the timing interval

has

been

completed, the

identifier should repeat the coded

message.

4.

If

the identifier

has

performed properly in step 3,

wait

until

one more timer interval

has

elapsed. The identifier should

not

repeat the coded

message.

5.

After

step 4

has

been

completed, push test switch 8 again. The identifier should

emit the coded

message

immediately.

If

the identifier

has

successfully

passed

these five tests

it

is

working properly. Check all connections

between the I

D-1

A and the repeater transmitter

for

loose

joints

and

wiring errors during final in-

stallation.

7

Hal Communications ID-1A User manual

Popular Repeater manuals by other brands