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565rffeedback [2021/07/17 12:52] pa1ap [As mentioned before two main factors determine success for the Orion] |
565rffeedback [2021/07/17 17:56] pa1ap [Before and after experience] |
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| 1.3- The choice to use front panel microphone connector and using the internal microphone amplifier works well despite my bad scenario setup when following point 1.1. | 1.3- The choice to use front panel microphone connector and using the internal microphone amplifier works well despite my bad scenario setup when following point 1.1. | ||
| - | 1.4- The choice to use the read panel din connector and using an external microphone amplifier and 600:600 audio transformer works well despite my bad scenario setup when following point 1.1. | + | 1.4- The choice to use the rear panel din connector and using an external microphone amplifier and 600:600 audio transformer works well despite my bad scenario setup when following point 1.1. |
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| ===== Before and after experience ===== | ===== Before and after experience ===== | ||
| - | Before the antenna system setup change the Orion hardware mic gain was set to 10dB and mic gain set to 100. Still my ALC led faded away at times (not always) and it was frustrating. Stations reported my audio sounded raw and to much low frequency audio. My solution was to move the TX EQ low pass to a higher value and this sounded better according to responding stations. Same experience when using the rear connector, connecting through 600:600 ohm audio transformer, Behringer voice optimizer and the same Heil PR-781 microphone the result. Raw sounding audio. Stations did not complain but I did not get any compliments for great audio either. | + | Before the antenna system setup change the Orion hardware mic gain was set to 10dB and mic gain set to 100. Still my ALC led faded away at times (not always) and it was frustrating. Stations reported my audio sounded raw and to much low frequency audio. I blamed the microphone at that moment. My solution was to move the TX EQ low pass to a higher value and this sounded better according to responding stations. Same experience when using the rear connector, connecting through 600:600 ohm audio transformer, Behringer voice optimizer and the same Heil PR-781 microphone. The result was still raw sounding audio. Stations did not complain but I did not get any compliments for great audio either. |
| - | After the change the Orion started to behave like it should according the manual. The hardware mic gain set to 0 db and the mic gain is around 80 now. ALC led is lively following my voice at all times. Stations report and compliment on audio quality. Speech processor can be set to level 9 and the Orion keeps working like expected. Right now I am using the speech processor at level 6 and it really works well. | + | After the change the Orion started to behave like it should according the manual. The hardware mic gain set to 0 db and the mic gain is around 80 now. ALC led is lively following my voice at all times and regardless of output power. Stations report and compliment on audio quality. Speech processor can be set to level 9 and the Orion keeps working like expected. Right now I am using the speech processor at level 6 and it really works well. |
| ===== My take away’s are: ===== | ===== My take away’s are: ===== | ||
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| 4.1- Ferrite chokes will help here to increase impedance towards paths you don’t want the resulting RF signals to travel. | 4.1- Ferrite chokes will help here to increase impedance towards paths you don’t want the resulting RF signals to travel. | ||
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| + | ===== difference between firmware 1 and firmware 2/3 ===== | ||
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| + | There is no real confirmation available but from experience firmware 1 was less sensitive for RF feedback. The real change has been DSP firmware and the audio processing. I can only guess that somehow the processing delay has changed in combination with the ALC interaction. Perhaps the hang-time changed too. In the end I believe the response to RF feedback is different but it does not change RF feedback taking place. | ||
| I am certainly not an expert on this topic. I hope this description will support others when RF feedback occurs with the Ten-tec Orion. Best regards, Onno pa1ap | I am certainly not an expert on this topic. I hope this description will support others when RF feedback occurs with the Ten-tec Orion. Best regards, Onno pa1ap | ||
