July 16, 2019, 05:05:15 PM

Author Topic: Zetron Model 38A repeater Tone Panel  (Read 81 times)

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February 02, 2019, 12:27:38 PM

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Zetron Model 38A repeater Tone Panel

The Zetron Model38 Repeater Panel is a flexible, remotely programmable repeater tone panel that converts any station capable of duplex operation into a full featured repeater. The Model38 is an ideal replacement for older card-per-user tone panels, eliminating time consuming trips to remote repeater sites as well as the high cost of individual tone cards for each customer.
With a Zetron Repeater Panel, a system operator can add or remove customers without traveling to the repeater site. Records of repeater system use may also be obtained with the touch of a key on the Zetron Model 8B Programmer/ Timekeeper. Up to 60 different customers or user groups can be accommodated by a single Model38. (With the 50 CTCSS/18 DCS option, up to 68 users can be accommodated.) The Zetron Model38 is an ideal choice for retrofitting existing repeaters or developing new shared systems.

PERFORMANCE FEATURES

ToneLock, a Zetron exclusive, eliminates repeater talkdown or dropout resulting from weak, fading signals, high modulation levels, or poorly processed mobile transmitter audio. A ToneLock equipped Model38 will recognize a CTCSS tone or digital code with a receiver quieting level of 3 dB SINAD. Typical programmable tone panels require a minimum of 8 dB SINAD before reliable tone decoding occurs. The Model 38 can even out perform traditional reed type decoders. The Model38 will not false on adjacent tones, even when receiving CTCSS tones transmitted with a phase reversal.
The Model 38 is available at no extra charge with 50 CTCSS tones and 18 digital squelch codes. This special software permits the use of the Model 38 in radio systems that use non-EIA CTCSS tones. This makes the Model 38 ideal for older radio systems that may use non-EIA tones. The Audio Quality of the Model38 is immediately obvious when upgrading older repeater panels or replacing other programmable panels.

DECODER
Frequency Range    67 to 250.3 Hz
38 CTCSS/22 DCS (Standard)
No. of Tones
No. of Digital Codes
Bandwidth    
38
22
1.5%
50 CTCSS/18 DCS
No. of Tones
No. of Digital Codes
Bandwidth    
50
18
1.0%
Input Impedance    100K-ohm AC coupled. For connection to unsquelched discriminator audio
ENCODER
Freq. Accuracy
Freq. Stability
Output Amplitude
Output Mode
Output Distortion
impedance    0.1 Hz
Crystal controlled
0.0 to 3.0 V p-p, selectable
Flat or de-emphasized
Less than 1%
Less than 1K-ohm AC coupled
TONE ENCODER
Morse ID Freq.    1200 Hz; adjustable �800 Hz
Beep Frequency    1000 Hz; adjustable 400 to 3000 Hz
DTMF Encoder    Standard DTMF tones
GENERAL
Connections    Discriminator; Push-to-Talk; CTCSS, Output; Repeat Audio; Alarm Input/Remote PTT Input; Power; Ground
Connector Type    Detachable screw terminal
Transmit    SPDT relay
Adjustments    Four adjustments from rear panel: Input Level; CTCSS Encode Level; Output Level; Squelch
Indicators    Power; Carrier; Decode; Encode; Transmit; DTMF
Local Prog. Port    Front-panel audio jack for local DTMF programmer
Serial Data Port
Interface
Handshake
Baud Rate    RS-232 compatible levels:
Tx data, Rx data, common/gnd
Follows XON/XOFF protocol
Selectable: 150; 300; 600; 1200; 2400; 4800
Rear Switches    Audio Input Level (high/low); Audio Input (flat/de-emphasized);
CTCSS Output Level (high/low);
CTCSS Output (flat/de-emphasized);
Audio Output Level (high/low); COR (internal/external); COR Polarity (positive/negative)
Repeat Audio    Flat or de-emphasized
Long Digit Reset    A single DTMF digit received by the
Model 38 for 15 seconds may be used to reset the Model 38 remotely.
ToneLock    ToneLock decodes a CTCSS tone with a receiver quieting level of 3 dB SINAD after initial acquisition
COR Input Range    Adjustable threshold of 0 to 7VDC.
Level must change by at least 1 volt between carrier and no carrier conditions
Squelch Tail Elimination    Model 38 decodes mobile�s reverse phase burst, or digital turnoff code
Current Consumption    350 mA at 13.8VDC
Oper. Voltage Range    11VDC to 15.0VDC
Rack-Mount Size    1.7" x 19" x 4.8"
Weight    2.2 lb
Operating Temp    0 to 65 degrees C.

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