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565rffeedback [2021/07/17 17:55] pa1ap [Before and after experience] |
565rffeedback [2021/07/17 17:58] (current) pa1ap [My take away’s are:] |
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| 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. | 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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| 3.1- A coax fed dipole with a current balun at the center will force balance between the two legs of the dipole. The effect of the current balun will be a significant common mode rejection and hence small (if any) resulting RF at the opposite side of the coax. Until the dipole is used on other than designed frequencies. | 3.1- A coax fed dipole with a current balun at the center will force balance between the two legs of the dipole. The effect of the current balun will be a significant common mode rejection and hence small (if any) resulting RF at the opposite side of the coax. Until the dipole is used on other than designed frequencies. | ||
| - | 3.2- A balanced open feedline has low loss and great advantages being able to be used on other than designed frequencies. However it assumes a balanced dipole which is only theory. More likely you have an unbalanced system resulting in resulting RF at the other end of the balanced feedline but now with only small loss. In a way this great advantage has also great disadvantages. | + | 3.2- A balanced open feedline has low loss and great advantages being able to be used on other than designed frequencies. However it assumes a balanced dipole which is only theory. More likely you have an unbalanced system resulting in RF at the other end of the balanced feedline but now with only small loss. In a way this great advantage has also great disadvantages. |
| 4- Always ensure resulting RF at the transmitter can travel somewhere else than your microphone cable, headphone cable and such like. Ensure the path for resulting RF has a very low impedance compared to all your other cables. | 4- Always ensure resulting RF at the transmitter can travel somewhere else than your microphone cable, headphone cable and such like. Ensure the path for resulting RF has a very low impedance compared to all your other cables. | ||
