INTRODUCTION

The Model 48jr is a tone panel and interconnect that is integrated into a single, compact repeater module. Only 6.25 inches wide and 1.4 inches high, it fits into even the smallest repeater enclosure. Interface cables are available for quick connection to popular radios, thus creating a full-featured, interconnected repeater. The Model 48jr provides all 154 CTCSS (PL) tones and DCS (DPL) codes. This allows radio users to key up and talk within individual work groups in normal dispatch fashion. The Model 48jr also provides a telephone interface so authorized radio users can place and receive telephone calls into the public telephone network, or into a PBX.

Selective calling of individual radios is accomplished using CTCSS and DCS (PL and DPL) tones. This allows inexpensive handheld and mobile radios to be used and avoids expensive two-tone or DTMF decoders. Selective calling may be enabled both for phone-to-radio calls as well as for radio-to-radio calls.
All programming is accomplished by dialing into the unit from a Touch-Tone telephone or from a DTMF radio.

PHONE-TO-MOBILE, MOBILE-TO-PHONE CALLS

The telephone interconnect portion of the product enables radio users to place and receive phone calls. Each of up to 154 users may be allowed or denied access to the telephone line. To place a mobile-to-phone call, a radio user . Longer mobile typically keys up and enters  * access codes (up to 9 digits) may be used for increased security if desired. After dial tone is obtained, the user dials a phone number. The number is either accepted or rejected based upon the programmed toll restrictions. During a conversation, call-limit and mobile-activity timers ensure the call is properly processed and terminated. To initiate a phone-to-mobile call, the landline phone party first dials the telephone number of the 48jr. The caller can use either a Touch-Tone or rotary-dial telephone. When the 48jr answers the line and issues dial tone, the caller dials the three-digit number of the radio to be reached. Ringing tones are transmitted over the radio channel, accompanied by the target radio�s CTCSS/DCS. The called radio user must enter a valid connect code to answer the call (1-9 digits, typically ).*

If the 3-digit number entered by the caller is programmed in the 48jr as a "talkback mobile", after a single ring on the radio channel, the caller may speak directly to the mobile user without the necessity of the mobile first answering the call. The called mobile may key up and answer without entering a connect code.
The 48jr can also be programmed to automatically ring out to a specific default CTCSS/DCS user whenever a ringing phone line is detected. During a phone call, only the originating radio user may speak to the phone party. CTCSS/DCS validation is used to prevent other radio users or interference from being heard by the phone or mobile parties. A �half-privacy� masking tone may be enabled to prevent other mobiles from listening to the mobile side of a conversation.

MOBILE-TO-MOBILE CALLS

Mobile-to-mobile calls are placed in a similar manner as are mobile-to-phone calls. If the originating user dials a valid mobile number, ringout tones are broadcast on the channel with the appropriate CTCSS/DCS selective signaling. When the called mobile answers with a valid connect code, the two users may communicate. During the call, only the two mobiles (or groups) may communicate since cross-tone CTCSS/ DCS encode and decode validation is processed. This prevents other radios or interference from being heard by the units involved in the conversation.

DISPATCH (COMMUNITY REPEATER) OPERATION

Any of the 154 user groups (50 CTCSS, 104 DCS) may be programmed for dispatch operation. A dispatch user may simply key up and speak through  the repeater to the rest of the user group, and other groups� radios remain silent. There is no need for connect codes and disconnect codes. In fact, DTMF pads are not necessary for dispatch operation.
Regenerated CTCSS/DCS encode, repeat audio processing, squelch tail elimination, repeater time-out and hold timers are all employed to ensure quality repeater operation.

FEATURES

• Small, compact design (6.25"W x 7.1"D x 1.4"H)
• Dispatch (repeater) operation for up to 50 CTCSS and 104 DCS users
• Interconnect with CTCSS/DCS selective calling
• Phone-to-mobile, mobile-to-phone, and mobile-to-mobile calling
• Database for 154 users or groups
• Remote programmable via Touch-Tone phone or DTMF radio
• Toll restricts selectable per user
• Half- or full-duplex operation, with mobile privacy masking tone
• Squelch tail elimination
• 10 speed-dial telephone numbers
• Dial click decoder for rotary telephone lines

OPTIONS

• Interface cables for popular radios
• Mounting kit for Motorola GR300, GR500, and GR1225 repeaters

Specifications

GENERAL

TELEPHONE INTERFACE

RADIO INTERFACE

RADIO INTERFACE