Specifications

Page 5
LEVEL SETTING AND INTERFACE ADJUSTMENTS
Jumper JP1 - Audio Gain Select Jumper
This jumper is used to set the range of microphone and DTMF audio output from the 710 microphone. The 710 is
shipped with JP1 installed (IN), and will accommodate requirements where the microphone audio is in the range of
40 mV or less. For transceivers that require a higher level microphone input, cut JP1 (OUT) as shown in Figure
"A".
Audio Output Level (RV2)
This adjustment sets the microphone level for voice modulation only. While monitoring the transmitter frequency
on a service monitor, press the microphone PTT switch and set RV2 on the 710 microphone so that the voice
deviation just goes into limiting (clipping) while speaking in just above an above-average level.
DTMF Tone Output Level (RV1)
For reliable DTMF signaling: The DTMF tone deviation should be approximately 2/3 of the maximum deviation
(for example: if the modulation limiting is set to 5.0 KHz, then the DTMF level should be 3.3 KHz). In any event,
the DTMF Tone transmitted by the 710 microphone should not be clipped or distorted. If your service monitor does
not have a CRT display to observe the transmitted waveform, use an oscilloscope connected to the "demod" output
from the service monitor to visually verify the quality of this signal. Set RV1 for the proper DTMF Tone level (3.3
KHz).
Note: Since no ANI's are programmed in the Model 710 microphone when you receive it from the factory, the
"*" and "#" keys can be used to manually generate a DTMF tone for level setting.
Automatic Off-Hook ANI-UP and On-Hook ANI-DOWN
This feature is not enabled as shipped from the factory. To enable the feature: solder a jumper wire across JP3,
placing CR2 into the circuit (see schematic diagram). The feature has applications in some radio common carrier
and other services.
OPERATION
PROGRAMMING ANI
The Automatic Number Identification and Automatic Dialing features may be programmed by either the system
operator/dealer or the user. Because the Automatic ANI feature of the Model 710 is a control feature only
applicable to the system owner or dealer, instructions for programming the ANI's are published in a separate
instruction manual available only to authorized dealers, service technicians, systems operators, and radio
common carriers.
Once the ANI's have been programmed, operation of the Model 710 to transmit the ANI's is simple: The "ANI-UP"
code is automatically transmitted whenever the "*" key is depressed. Pressing the "#" key sends the "ANI-DOWN"
code. These ANI codes can also be sent with the "OFF-Hook" and "ON-Hook" function, if enabled. The actual
functions of the ANI codes are system-dependent.
With the Model 710 sidetone feature, you can hear the actual ANI codes as they are transmitted. After the
transmission of the ANI-UP code is sent, you should wait for a dial tone and then manually or automatically dial the
desired telephone number (normal operation). For other system operations: contact your system operator or
manager for instructions.