GA All: I have seen many posts and questions on the issues that show up when the audio input level is too high but have missed a technical process for actually setting it.
Without having a deviation meter, how does one actually set the proper audio input level when using an APRS device? How I've done it in the past: 1. Listened to the signal using a second rx and adjusting the audio level until it "sounds like it isn't overdriving" Going a little further, using a second rx, actually use a PC and APRS decoder to monitor the signals. This is pretty cumbersome and requires a second rx and decoder and a dummy load. -OR- 2. Using a 10x or fet scope probe, monitor the microphone input signal level when speaking in a normal "communications" level voice. Set the APRS audio input to the same level. This of course only works if you are using the mic input. It might work if the packet or data input is in the same chain and you track down a common point to monitor the audio. Again, pretty time consuming. Is there an accurate way that yields an effective deviation result or is the decoding process so robust that any deviation under the max within reason works OK? Thanks, Curt
