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Link Communications RLC-6, Manual, Page: 30 / 34

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Link Communications RLC-6 Manual Download Page 30

Copyright 1993 Link Communications

TROUBLESHOOTING THE RLC-6

NO PTT ON MAIN RECEIVER PORT

- Make sure COR voltage on Main Receiver is connected.
- Does COR voltage go above 2.5V or below 2.0V when active?
- Is the COR sense switch in the right position?
- Is your repeater controller set for low going COR?
- Does your main transmitter accept low (gnd) PTT?
- Is your transmitter plugged in?
- Check Q1 for a low on Main RX COR (Drain).

NO PTT ON THE LINK TRANSMITTERS

- Check the selected MODE to see is transmitter enabled.
- Does COR voltage go above 2.5V or below 2.0V?
- Is the COR sense switch in the right position?
- Does your link transmitter accept low (gnd) PTT?
- Is your transmitter plugged in?
- Check Q2 or Q3 or Q4 for a low on Link RX COR (Drain).
- Are you in Hub linking when you should be in Chain?

PTT BUT NO AUDIO ON THE TRANSMITTERS

- If there is not an active COR, there will be no audio.
- Is there audio present on JP1 (see Audio Adjustment)?
- Are the audio out adjustments turned up ("up" may be counterclockwise)?
- Are the receivers connected to the RLC-6?
- Is the audio connected to the transmitter?
- Is the audio out impedance strapped correctly?

NO CONTROL OVER THE RLC-6 MODES, OR THE MODES ARE DIFFERENT

- Are the three control lines connected?
- Do the lines go to ground (Low) when active?
- Are the lines connected in the correct order?
- Do the control lines, when inactive, go above 5V?
- Have the contents of the EPROM's been changed?
- Are you selecting the correct modes with your control lines?

AUDIO OUTPUT DEVIATION CHANGES WHEN CHANGING RECEIVERS

- Were the audio input levels adjusted correctly (See Audio Input Adjustment
     section)?
- Are any of the transmitters loading down the board?
- Have any of the receiver's audio been changed since the initial adjustments?
- Is any other audio source connected to the same audio output/transmitter input line? 

27

Summary of Contents for RLC-6

Page 1: ...LINK COMMUNICATIONS RLC 6 4 PORT LINK EXPANSION INTERFACE 899 Parkway Lane Billings MT 59101 4652 406 245 5002 V 2 1 June 2 1993...

Page 2: ...Logical COR Sense Lines 5 Audio Adjustments Receiver Audio Adjustments 6 JP1 Audio Test Point Pinouts 6 Transmitter Audio Output Impedance Selection 7 Transmitter Audio Output Adjustment 7 TXIN CW or...

Page 3: ...T BE CONSIDERED TO AVOID DAMAGE DUE TO STATIC ELECTRICITY WHEN HANDLING THE BOARD BE IN CONTACT WITH GROUND HANDLE THE BOARD BY ITS EDGES AND DO NOT TOUCH THE INDIVIDUAL CHIPS WITHOUT BEING DISCHARGED...

Page 4: ...t the receiver s audio the 4066 passes the audio When the link controller chooses to disconnect a receiver from the board s operation its receiver s COR will not unsquelch the incoming audio All audio...

Page 5: ...w going voltage does not go below 2V the link controller will not accept it as a valid COR A simple way of lowering your COR voltage is by adding external diodes in series with your COR signal Each di...

Page 6: ...ignal The individual HUB linking modes are covered in the mode descriptions section CHAIN Linking When the RLC 6 is set to be in the CHAIN linking mode the individual links can PTT other links This mo...

Page 7: ...the same time intermediate modes might be selected while the user is selecting their intended mode For example The RLC 6 is set for Mode 0 control lines 0 1 2 are all inactive 5V remember that they ar...

Page 8: ...er with a known tone about 1 Khz and adjust the input level pot MIN to 2V peak peak 1 4V RMS or a level that is not into clipping Note that to increase some of the levels the pot must be turned counte...

Page 9: ...level This finishes the audio level adjustments TXIN ADJUSTMENT The TXIN audio input is usually connected to the main transmitter audio bus you may not use it at all It can be used to send CW or voice...

Page 10: ...alse MODE CONTROL LINES 1 2 3 0 H H H 1 H H L 2 H L H 3 H L L 4 L H H 5 L H L 6 L L H 7 L L L TERMS H High Voltage 5V or an open pin L Low Voltage 0V or a grounded pin The RLC 6 internally pulls up th...

Page 11: ...ort There is only one audio mixer on the RLC 6 which contains the mixed audio from all of the ports including main that are not muted This means that if the main receiver is keyed up and the the main...

Page 12: ...ach situation The next four columns labeled Audio Output Connected To identify what audio source will be connected to each transmitter The audio sources are the main port is also called port 0 main ou...

Page 13: ...link3 A A A x A A A A A x A link2 A A A x A A A A A x x link2 A A A x A A A A x A A link1 A A A x A A A A x A x link1 A A A x A A A A x x A link1 A A A x A A A A x x x link1 A A A x A A A x A A A A m...

Page 14: ...enever link 1 is keyed up it goes out main Whenever main is keyed up it goes out link 1 The other links are ignored Mode 2 Active COR Inputs Audio Output Connected To Active PTT 0 1 2 3 0 1 2 3 0 1 2...

Page 15: ...n is keyed up it goes out link 3 The other links are ignored Mode 4 Active COR Inputs Audio Output Connected To Active PTT 0 1 2 3 0 1 2 3 0 1 2 3 A A A A A A A A A A A A A A A x A A A A A A A A A A x...

Page 16: ...ink 1 is not if it is not out voted link 3 goes out main Whenever main is keyed up it goes out both connected links Mode 6 Active COR Inputs Audio Output Connected To Active PTT 0 1 2 3 0 1 2 3 0 1 2...

Page 17: ...ected To Active PTT 0 1 2 3 0 1 2 3 0 1 2 3 A A A A A A A A A A A A A A A x link3 A A A x A A A A A x A link2 A A A x A A A A A x x mix A A A x A A A A x A A link1 A A A x A A A A x A x mix A A A x A...

Page 18: ...e for mixed and voted audio modes This is because with only one link port connected there can never be more than one audio source to choose from obviously you wouldn t count yourself so no decisions n...

Page 19: ...ink2 A A A x A A A A A x x link2 A A A x A A A A x A A link1 A A A x A A A A x A x link1 A A A x A A A A x x A mix A A A x A A A A x x x mix A A mute x A A A x A A A A main main A A x x A x A A x A ma...

Page 20: ...er main is keyed up it goes out both link 1 and link 3 Mute is used for the same reasons discussed for Mode 4 above Mode 6 Active COR Inputs Audio Output Connected To Active PTT 0 1 2 3 0 1 2 3 0 1 2...

Page 21: ...HAIN VOTED Mode 0 Active COR Inputs Audio Output Connected To Active PTT 0 1 2 3 0 1 2 3 0 1 2 3 A A A A A A A A A A A A A A A x link3 link3 link3 A x x x A A A x A link2 link2 A link2 x x A x A A x x...

Page 22: ...A A A x A A A A main A A A x A A x A A x A main A A A x A A x A x A A main A A A x A A x A x x A main A A A x A A x x A A link1 main A A x x A A x x A x link1 main A A x x A A x x x A link1 main A A x...

Page 23: ...Active COR Inputs Audio Output Connected To Active PTT 0 1 2 3 0 1 2 3 0 1 2 3 A A A A A A A A A A A A A A A x A A A A A A A A A A x A link2 link2 A A x x A A A A x x link2 link2 A A x x A A A x A A...

Page 24: ...k1 main A main x x A x x x x A link1 main A main x x A x x x x x link1 main A main x x A x See note on mode 4 above Mode 6 Active COR Inputs Audio Output Connected To Active PTT 0 1 2 3 0 1 2 3 0 1 2...

Page 25: ...d To Active PTT 0 1 2 3 0 1 2 3 0 1 2 3 A A A A A A A A A A A A A A A x link3 link3 link3 A x x x A A A x A link2 link2 A link2 x x A x A A x x mix mix link3 link2 x x x x A x A A link1 A link1 link1...

Page 26: ...A A x A A x A A x A main A A A x A A x A x A A main A A A x A A x A x x A main A A A x A A x x A A link1 main A A x x A A x x A x link1 main A A x x A A x x x A link1 main A A x x A A x x x x link1 ma...

Page 27: ...x A x A A x A x link1 A link1 A x A x A A x x A mix link2 link1 A x x x A A x x x mix link2 link1 mute x x x A x A A A A main main A A x x A x A A x A main main A A x x A x A x A link2 mix main A x x...

Page 28: ...mix mix A mix x x A x x x x A link1 main mute mix x x A x x x x x mix mix mute mix x x A x See note on mode 4 above Mode 6 Active COR Inputs Audio Output Connected To Active PTT 0 1 2 3 0 1 2 3 0 1 2...

Page 29: ...link1 x x x x x x x A mix link2 link1 mix x x x x x x x x mix mix mix mix x x x x This mode has many compromises The main port carries mixed audio anytime more than one port is keyed up If main is al...

Page 30: ...SMITTERS If there is not an active COR there will be no audio Is there audio present on JP1 see Audio Adjustment Are the audio out adjustments turned up up may be counterclockwise Are the receivers co...

Page 31: ...C17 C18 C24 C25 100pF C26 C27 C29 4 1 C50 100uF 5 1 D1 1N914 6 1 JP1 6 PIN HEAD F 7 1 JP2 2 HEAD JUMPER 8 1 P1 25 PIN RA F 9 1 P2 25 25 EDGE 10 1 P3 10 10 HEADER 11 5 Q1 Q2 Q3 Q4 Q9 2N7000 12 4 Q5 Q6...

Page 32: ...______________________________________________ 20 2 U1 U2 2732A 45 21 4 U3 U4 U5 U6 4051 22 1 U9 74HC123A 23 1 U13 LM7805 24 1 U14 LM317 25 2 U15 U17 74HC08 26 1 U16 4066 27 1 U18 74HC86 28 1 U19 74HC...

Page 33: ...TROL RX SIGNALING INV MAIN COR 23 MIX COR IN ROUTED TO S COM CONTROL RX COR CONNECTOR 26 USER 1 ACTIVE LOW NOT IMPLEMENTED UP TO USER 27 USER 2 ACTIVE LOW NOT IMPLEMENTED UP TO USER 28 USER 3 ACTIVE L...

Page 34: ...AIN LINKING MODE ON H C LED ON INDICATES VOTED AUDIO ON V M PLEASE OBSERVE THE CORRECT POLARITY OF THE INTERFACE CABLE CONNECTING THE LED BOARD TO THE RLC 6 P3 CONNECTION NOTE IF NO TRANSMITTERS ARE C...

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