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565frontandrearaudio [2021/07/19 16:47]
pa1ap created
565frontandrearaudio [2021/09/30 07:40] (current)
pa1ap [Connecting your audio gear to the rear din connector]
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 Both connectors can be controlled with a menu setting. The front connector is designed to be used with a directly connected microphone and includes a microphone amplifier within the audio path. Through the menu one can set a hardware gain as well a software gain for the front connected microphone. Both connectors can be controlled with a menu setting. The front connector is designed to be used with a directly connected microphone and includes a microphone amplifier within the audio path. Through the menu one can set a hardware gain as well a software gain for the front connected microphone.
  
-The rear connector expects line level audio and as the front connector is unbalanced. With a menu setting one can switch between the audio source mic, aux or both. +The rear connector expects line level audio and like the front connector is unbalanced. With a menu setting one can switch between the audio source mic, aux or both. 
  
 The rear connector does not include a microphone amplifier and hence connecting a microphone would require an external device to amplify the mic audio to line level. The rear connector does not include a microphone amplifier and hence connecting a microphone would require an external device to amplify the mic audio to line level.
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 ==== Balanced versus unbalanced ==== ==== Balanced versus unbalanced ====
  
-Using a balanced audio setup reduces noise and improves common mode rejection. Because the rear connector expects line level audio it is good to have a balanced setup. Keep in mind that at the din connector an unbalanced audio connection is provided+Using a balanced audio setup reduces noise and improves common mode rejection. Because the rear connector expects line level audio it is good to have a balanced setup. Keep in mind that at the din connector an unbalanced audio connection is expected
  
 ==== Known issue rear din connector ==== ==== Known issue rear din connector ====
  
-Reported by Peter oz1pif and later confirmed by many others the rear din connector has a design error. The audio input pin also has a 5 volt dc voltage and when using an audio transformer you need to include a decoupling ​capacitor to avoid transformer saturation. ​+Reported by Peter oz1pif and later confirmed by many others the rear din connector has a design error. The audio input pin also has a 5 volt dc voltage and when using an audio transformer you need to include a coupling ​capacitor to avoid transformer saturation. ​
  
 ==== Transformer and ground shield ==== ==== Transformer and ground shield ====
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 Use a good quality audio cable with two wires which are isolated from but reside within a common shield. ​ Use a good quality audio cable with two wires which are isolated from but reside within a common shield. ​
  
-Taking above into account ​ all you need to ensure is that the body of the microphone is connected to the orion chassis by using the audio cable shield. The actuall mic and mic wires should reside within the cable shield and not use the cable shield as means to pass audio.+Taking above into account ​ all you need to ensure is that the body of the microphone is connected to the orion chassis by using the audio cable shield. The actuall mic and mic wires should reside within the cable shield and not use the cable shield as means to pass audio.
  
-At the Orion front panel ensure mic and mic are connected to pin 1 and pin 2. Last but not least connect the shield to the body of the plug.   ​Latter to ensure the shield becomes part of the Orion chassis. ​+At the Orion front panel ensure mic and mic are connected to pin 1 (+) and pin 2 (-). Last but not least connect the shield to the body of the plug.   ​Latter to ensure the shield becomes part of the Orion chassis. ​
  
 Optionally if PTT is also provided by the microphone ensure that the PTT wires resides outside the audio cable shield. ​ Optionally if PTT is also provided by the microphone ensure that the PTT wires resides outside the audio cable shield. ​
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 ==== Connecting your audio gear to the rear din connector ==== ==== Connecting your audio gear to the rear din connector ====
  
-One can use a audio transformer but this is not mandatory. ​ When using an audio transformer keep in mind the recommendation above. Include a decoupling ​capacitor as well ensure the audio shield is starting at the Orion chassis way up to the actuall microphone body. +One can use a audio transformer but this is not mandatory. ​ When using an audio transformer keep in mind the recommendation above. Include a coupling ​capacitor as well ensure the audio shield is starting at the Orion chassis way up to the actuall microphone body. 
  
 When connecting the rear connector directly to the microphone amplifier please ensure the amplifier can run in unbalanced mode. Some equipment recognizes balanced / unbalanced connection automatically and some require additional configuration. Furthermore just like all other configurations ensure the audio shield is starting at the orion chassis all the way up to the actual microphone body. When connecting the rear connector directly to the microphone amplifier please ensure the amplifier can run in unbalanced mode. Some equipment recognizes balanced / unbalanced connection automatically and some require additional configuration. Furthermore just like all other configurations ensure the audio shield is starting at the orion chassis all the way up to the actual microphone body.
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 ==== Microphone body ==== ==== Microphone body ====
  
-Most microphone bodies are made from some conductive material such as aluminium. Without exception all my Heil microphones ​werr nicely painted however the paint acted as isolation as well. Hence the shielding was compromised and after removing some of tge paint the whole mic body was part of the shielding. ​+Most microphone bodies are made from some conductive material such as aluminium. Without exception all my Heil microphones ​were nicely painted however the paint acted as isolation as well. Hence the shielding was compromised and after removing some of the paint the whole mic body was part of the shielding. ​
  
 ==== Line level and its actual level ==== ==== Line level and its actual level ====
  
 In most cases the aux level has to be set to a low level of around 8. Adding a 20-30dB attenuator at the din connector provides a better match. I have used 30 dB and the aux level was set to around 50 if I recall correctly providing better resolution. The attenuator can also be used to move from balanced to unbalanced at the same time.  In most cases the aux level has to be set to a low level of around 8. Adding a 20-30dB attenuator at the din connector provides a better match. I have used 30 dB and the aux level was set to around 50 if I recall correctly providing better resolution. The attenuator can also be used to move from balanced to unbalanced at the same time. 
 +
 +===== Associated pages =====
 +* [[565michookup|Orion Mic Hook-up]]
 +
 +* [[565rffeedback|Rf feedback]]
 +
  
 Hope this helps and regards Onno pa1ap Hope this helps and regards Onno pa1ap

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