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Section 2. Specifications 

 

2-2

 

 

INTERFACE 

 

Connections 

Rx audio, Tx key, CTCSS / DCS encode, Tx audio (mic), 12 
VAC or DC power, ground.  Optional carrier detect, alarm input 
and aux output. 

Connector type 

Detachable screw terminal. 

Rx input impedance 

50 K

 AC coupled.  For connection to unsquelched 

discriminator audio. 

CTCSS / DCS output  Level: 0 to 4 Volts p-p.   Impedance: Less than 1 K

 AC 

coupled. 

Transmitter type 

Direct FM, or phase modulation.  Flat or de-emphasized CTCSS 
encode. 

Transmitter keying  

SPDT relay. 

Carrier detect 

Internal noise detector or external carrier detect input.  External 
input threshold adjustable 0 to 7 VDC.  

Adjustments 

Four adjustments from rear panel: Rx input gain, CTCSS / DCS 
encode gain, Tx audio output gain, and carrier detect threshold. 

Configuration 
switches 

Eight switches on rear panel:  Rx audio gain high/low, repeat 
audio flat/de-emphasized, encode gain high/low, encode flat/de-
emphasized, tx audio gain high/low, COR source 
internal/external, COR polarity positive/negative, COR pull up 
on/off. 

RS-232 serial data 
port 

Front panel DB9 connector (non-standard pinout).  Interface 
cables available. 

Alarm / Remote PTT 
input 

Activated via contact closure to ground. 

Cables, interface 
notes 

Available for most repeaters and two-way radios.  

 

 

Summary of Contents for 38A

Page 1: ...ZETRON Model 38A Repeater Tone Panel Instruction Manual Part No 025 9043Y Please check for change information at the end of this manual Copyright 1986 1999 by Zetron Inc All Rights Reserved...

Page 2: ...atter consisting of Title Page Table of Contents 3 pages Statements 3 pages Other special pages 1 pages Correctly printed photos on Page Page Page Page Last page in each section 1 1 6 10 2 2 7 7 3 13...

Page 3: ...imeout Timer 3 5 Timeout User Identification 3 5 DTMF Regeneration 3 5 Airtime Hog Penalty 3 6 Temporary Cross tone or Cross code Encoding 3 6 Temporary Defeat of Cross tone or Cross code Encoding 3 6...

Page 4: ...5 13 Kenwood TKR 720 TKR 820 Repeater 5 14 Motorola GR300 Repeater or Two GM300 Radios 5 15 Motorola MTR2000 Stations 5 16 Motorola MSF 5000 Analog Repeater 5 17 Motorola MSF 5000 Digital Repeater 5...

Page 5: ...MF REMOTE PROGRAMMING MODE NOTES 7 1 MODEL 38 SYSTEM PROGRAMMING LOG 7 2 MODEL 38 CTCSS USER DATABASE PROGRAMMING LOG 7 4 MODEL 38 DCS USER DATABASE PROGRAMMING LOG 7 6 MODEL 38 PROGRAM MODE COMMAND S...

Page 6: ...functions can easily be customized for each of the 38 or 50 CTCSS tones and 22 or 18 digital coded squelch codes FEATURES Supports 38 or 50 CTCSS user groups with ToneLock high sensitivity decoding S...

Page 7: ...djustable 800 Hz per FCC rules Courtesy tone frequency 1 000 Hz adjustable 400 to 3 000 Hz Indicators Power carrier transmit decode encode DTMF Current consumption 350 mA at 13 8 VDC Operating voltage...

Page 8: ...oise detector or external carrier detect input External input threshold adjustable 0 to 7 VDC Adjustments Four adjustments from rear panel Rx input gain CTCSS DCS encode gain Tx audio output gain and...

Page 9: ...S decoder bandwidth than the standard 38 tone version The 50 tone version is not recommended for use with radios that use tunable encoders due to the possibility of the encoder becoming mistuned or dr...

Page 10: ...ONES CODES ARE ENABLED User Validation The Model 38 is always listening to the receive audio for the presence of an enabled user All 38 or 50 CTCSS tones and 18 or 22 of the digital codes can be marke...

Page 11: ...A MOBILE UNKEYS When a mobile unkeys CTCSS tone or DCS code is no longer detected the Model 38 will do the following Anti Kerchunker Filter The anti kerchunker filter cancels the transmit hold time a...

Page 12: ...tch to know when the mobile has unkeyed as opposed to knowing when the repeater has dropped off the channel When using the repeater for dispatch only the encode may be left on during the Tx hold time...

Page 13: ...e the second squelch tail heard by the mobiles when the repeater transmitter unkeys Repeater tailbips may be enabled to beep once every second during the repeater hold time Timeout Timer While mobiles...

Page 14: ...MF command sequence and can be enabled disabled on a per user basis An alert signal is sent during the transmitter hang time while the temporary cross tone or cross code mode is active Command sequenc...

Page 15: ...nded then the programmed CTCSS tone or DCS code will be encoded the repeat audio squelched and the transmitter keyed This condition will continue until the site alarm input is released This feature ca...

Page 16: ...bile does not unsquelch use the Model 38 digital encode invert selection The mobile should unsquelch on either the normal or inverted code 3 Set the transmitter CTCSS DCS encode deviation using a CTCS...

Page 17: ...0100110010 264AAE 143 01101111010100001100011 630AF6 464 01001111110100100110100 164BF2 145 01010101110100001100101 530BAA 465 11000001011100100110101 564E83 152 00111101100100001101010 2B09BC 466 110...

Page 18: ...073 065 271 263 205 516 432 071 306 265 156 523 246 072 245 266 454 526 325 073 506 271 065 532 343 074 174 274 145 546 132 114 712 306 071 565 703 115 152 311 664 606 631 116 754 315 423 612 346 122...

Page 19: ...S 02 Mobile to dispatcher call Rx CTCSS 01 Tx 01 Rx 02 Tx CTCSS 02 In this mode the dispatcher can communicate with the fleet but the fleet can not hear each other In order for talkthrough to be used...

Page 20: ...ion Off 12 Hog limit 0 12 Hog limit 0 13 Prepay mode Off 13 Prepay mode Off 14 Airtime 000 00 00 14 Airtime 000 00 00 15 Aux relay Off 15 Aux relay Off Table 3 6 RFW System Programming System Programm...

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