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| ninotnc-on-hf [2023/07/02 19:10] – ab4mw | ninotnc-on-hf [2023/07/02 19:12] – ab4mw |
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| Set the TX DEV potentiometer all the way to the left stop and then, turn it about half way to the right. | Set the TX DEV potentiometer all the way to the left stop and then, turn it about half way to the right. |
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| Connect the modem to the HF radio and tune to an empty channel and set the radio for a few watts of power for the time being (even better, use a dummy load!). Set the meter display on the HF radio to show you the ALC reading. Use the TEST button on the Nino TNC to make a short transmission and view the ALC meter on the HF radio. Note the ALC value and if it shows any reading at all, it is time to make the TX audio adjustment using the TX DEV potentiometer. You will likely need to turn this setting DOWN while transmitting in order to reduce the ALC to zero or near zero. If there is no ALC reading at this setting, slowly turn the potentiometer to the right until it begins to rise. Your target is as close to zero ALC as you can get for all PSK waveforms (more on FSK waveforms later). | Connect the modem to the HF radio and tune to an empty channel and set the radio for a few watts of power for the time being (even better, use a dummy load!). Set the meter display on the HF radio to show you the ALC reading. Use the TEST button on the Nino TNC to make a short transmission and view the ALC meter on the HF radio. Note the ALC value and if it shows any reading at all, it is time to make the TX audio adjustment using the TX DEV potentiometer. You will likely need to turn this setting DOWN while transmitting in order to reduce the ALC to zero or near zero. If there is no ALC reading at this setting, slowly turn the potentiometer to the right while transmitting until it begins to rise. Your target is as close to zero ALC as you can get for all PSK waveforms (more on FSK waveforms later). |
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| If you turn the potentiometer all the way to the right and still have no ALC while transmitting a TEST packet, then make a SIGNALS switch change to 1100 (on, on, off, off - left to right). This sets the TX audio coarse level to a higher value. Turn the TX DEV potentiometer all the way to the left (Off) and then to the right a 1/4 turn or so. Start the TEST packet process again and seek the ALC zero point. | If you turn the potentiometer all the way to the right and still have no ALC while transmitting a TEST packet, then make a SIGNALS switch change to 1100 (on, on, off, off - left to right). This sets the TX audio coarse level to a higher value. Turn the TX DEV potentiometer all the way to the left (Off) and then to the right a 1/4 turn or so. Start the TEST packet process again and seek the ALC zero point. |
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| Now turn up the HF radio's power level and seed out a Web SDR which can hear you and admire your work as you transmit the TEST packet. If all looks good, then you are ready to use your HF system over the air at an appropriate power level for your license class and RF exposure limits. | Now attach the antenna feedline, turn up the HF radio's power level, and seek out a Web SDR which can hear you and admire your work as you transmit the TEST packet. If all looks good, then you are ready to use your HF system over the air at an appropriate power level for your license class and RF exposure limits. |
