PIEXX ToneLCD Manuale utente

PIEXX ToneLCD

Universal Direct Reading CTCSS Tone Encoder/Decoder

Introduction

If you are like me, you hate looking up dipswitch settings for tone

encoder / decoder boards. The design goal that motivated the

ToneLCD was to come up with a miniature, full feature CTCSS

encoder / decoder that was easy to use. The ToneLCD is a small,

1.125 x 1.7 inches, easy to use, full-featured tone board that has a

miniature LCD that displays the operating tone!

Features:

•Encoder / Decoder for both transmit encode and receive tone

squelch decode operation.

•Find mode detects CTCSS tone that the receiver hears for

automatic operation.

•Small size, 1.3 x 1.8”

•Low power consumption

•Operates from 4-15VDC

•Dedicated detect output as well as audio path switch.

•Easy to Operate

•Fully configurable Power on State.

Connection to Transceiver

The pin out for J2, an 8 pin interface connector is as follows:

1. Receive Audio Output

2. No Connection

3. Tone Output

4. Tone Detect

5. Ground

6. Hang Up / Xmit Input

7. Audio In

8. Power 4-15 VDC

The power required for the ToneLCD is +4 to +15 VDC at approximately 9

mA. The power lead, pin 8 of J2 should be connected to a convenient

switched supply within your transceiver. The return connection for the

power is on J2 pin 5.

In order for the ToneLCD to operate in a tone squelch mode, it needs to

sample the detected audio and provide a way to disable the audio path in the

squelched condition. The ToneLCD provides an open collector transistor

output that can be connected into your transceivers circuitry to enable or

disable the audio path. An easier way to take care of both the tone input and

squelch requirements is to connect the ToneLCDs audio in, J2 pin 7 and

audio out, J2 pin 1, in series with the hot lead of your rigs volume pot. The

ToneLCD has an audio switch in line with this audio path, and this switch is

deactivated by the ToneLCD firmware when the tone squelch is activated

and the correct tone signal is not seen. The connection in a typical

transceiver is outlined in the schematic shown in figure 5. If you have no

need for tone squelch, simply connect J2 pin 7 to the high side of the volume

control and leave J2 pin 1 unconnected. If you do not connect the audio in

signal to the ToneLCD, the device will not be able to detect and report the

CTCSS tone being used with its FIND mode.

Fig. 1

ToneLCD

Receive Audio Connection

The tone output is available from the Uncoder on connector J2 pin 3. If your

rig has a connection point for a tone generator, you should connect the tone

out to it. Otherwise, connect J2 pin 3 to a point in the transceivers close to

the modulator and past the mic conditioning circuitry. The tone output level

from the ToneLCD can be adjusted to about 1V RMS if necessary. Often a

good point to inject the tone output is the high side of the deviation control.

If you must connect the tone output to a point in the transceiver near the mic

input you may need to install a series resistor in line with it to reduce the

tone signal level so that it won’t swamp out the modulator

The ToneLCD has an input signal, on J2 pin 6, that can be used as either a

transmit detector input or a hang up switch input. If the input is used as a

transmit detector, the CTCSS tone output will only be present when the

input line is asserted. Alternatively if you have a mic holder that is switched,

you can connect the input signal to it and when you unhook the mic the tone

squelch will be defeated allowing you to hear the channels activity. If the

input is used as a hang up, the receive audio path will be made, regardless of

the presence of a valid CTCSS audio tone, whenever the input line is

asserted. In the transmitter detector mode, P2 pin 6 should be connected to

either the PTT line on your Mic plug, the transmit indicator light or a

switched Xmit power connection. In the hang up mode, P2 pin 6 should be

connected to your mic hang up switch. Don’t worry about the polarity of the

signals; the input polarity can be switched in one of the setup menus.

Set up

After you have installed the ToneLCD on your transceiver, and applied

power, the display should show

tOn

briefly, and then it will show different

information depending on how the ToneLCDhas been set up.

You will need to adjust the setup parameters to match your hardware

configuration. To enter the setup mode, press and hold the

MODE

button,

for about 1 second, until the first setup parameter,

InH or InL

, appears.

Once in the setup mode, you can cycle through the various setup parameters

by momentarily pressing the

MODE

button (don’t hold it, that gets you out

of setup). Each time you press the

MODE

button, the program cycles to the

next setup parameter. Pressing the

Down

buttons will change the

value of a parameter. The setup parameters are defined as follows:

•

In (H or L)

– This sets the active polarity of the Input signal

line. L means low, and requires that the input signal be

grounded to be active. H indicates that the active input state is

high or floating.

•

In (r, t or

-) – This parameter sets the purpose of the input

signal.

is for receive, or more specifically for hang up mode.

is for transmit, this allows the input to be used to enable or

disable the CTCSS output tone. Finally, if this parameter is set

, the input signal is unused.

•

tO (H or L)

- Tone Detect output state. If the tO state is set to

L, the Tone Detect output will be pulled low in the presence of

a valid CTCSS tone applied to the audio input. If the tO state is

set to H, the Tone Detect output will be floating (high if you

pull it up with a resistor) in the presence of a valid CTCSS tone

applied to the audio input. The Tone Detect output is an open

collector transistor output.

•

tSt

– This is a test mode that allows you to see the state of the

input signal as well as letting you change the state of the Tone

Detect Output signal. You enter the test state by pressing either

the

Down

buttons when the

tSt

display is shown. When

you enter the test mode, the display will change to

I-O

where

the I will be either a 0 or a 1, indicating the state of the input

signal, and O will be either H or L indicating whether the

output state is High (floating) or Low. Pressing the

Down

buttons will flip the state of the Tone Detect Output.

Pressing the

MODE

button will leave the test mode and the

display will revert back to showing

tSt.

If you leave the

ToneLCD in the test mode for more than 60 seconds, the device

will automatically leave the Setup mode without saving any

changed parameters.

•

LCd –

This setup parameter is used to flip the LCD display

upside down, as well as reversing the Up and Down switch

functions. This is useful if you are mounting the ToneLCD in

different orientations.

•

Axx –

Where xx is a number between 0 and 31. This value

establishes the audio level passed between the Audio In and the

Receive Audio Output pins. Maximum signal is achieved when

a value of 31 is selected. A value of 0 completely attenuates the

audio path.

You can exit the setup parameter menu by pressing and holding the

MODE

button for 1 second. This will cause the ToneLCD to retain the parameters

you have just set. Alternatively, if you don’t press any keys for a minute or

so, the ToneLCD will automatically exit the setup mode, without saving the

parameters.

Operation

The ToneLCD has 4 modes of operation selected by momentarily pressing

the

MODE

button:

Off

– No CTCSS tone transmitted and the receive path is enabled.

t –

The

CTCSS tone is transmitted but the receive tone squelch is

disabled.

tr –

Both CTCSS transmit and receive squelch modes are enabled.

4. If ---, or a blinking tone value is shown on the display, then the

ToneLCD is in the FIND mode. In the FIND mode the ToneLCD

samples the Audio In line and if it ‘hears’ a valid CTCSS tone on the

receive audio it shows the values as a blinking set of digits on the

display. If no valid CTCSS tone is sensed, --- is displayed. In the

FIND mode, if a valid CTCSS tone is present for approximately ½

second, the ToneLCD’s tone frequency is set to that tone. This allows

a semi automatic mode of operation. If the ToneLCD finds a valid

tone, the next time you key up you will be transmitting on that same

tone.

When you are in the

Off, t or tr

operating modes, pressing the

DOWN

buttons will cause the active CTCSS tone frequency to be moved

up or down in value. You can slew the tone up or down by pressing and

holding the

DOWN

buttons.

Pressing the

DOWN

buttons, while in the FIND mode, will cause

the ToneLCD to leave the FIND mode and enter the “transmit only” (

)

mode.

After you have the ToneLCD set to the most convenient mode of operation,

you can save this as the default power up state of the device by

simultaneously pressing and holding the

DOWN

buttons for 1

second. This saves not only the tone frequency but also the current mode of

operation as the power up default.

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