With the AGC off the audio output voltage, in millivolts, across the 8 ohm resistor is directly proportional to the voltage, in microvolts, at the antenna jack of the 756PRO. The Icom 756PRO is set on AM with the AGC set to off. The ScopeView software has exactly all the features I need. Actually one can just connect the multi-meter across a jack plugged into the external speaker jack, but I prefer to have the resistor replace the speaker.Įquipment settings: I use the ScopeView feature of the Radio Shack software, not the logging feature. The multi-meter is set to measure the voltage, in millivolts, across this resistor. I have an 8 ohm non-inductive resistor plugged into the external speaker jack to replace my external speaker. The Radio Shack 22-805 is connected to one of my serial ports. ![]() The PW1 is used, in this case, only as an antenna tuner. A High Accuracy Method of Logging Noise Occurrencesīy Alan Robinson, W4LKE In view of the fact that other hams might want to use my method of recording noise, I think I should give you some more details about how I do it.Įquipment used: Icom 756PRO Receiver with Astron RS-35M Power Supply, Icom PW1 Amplifier, G5RV antenna, Radio Shack Model 22-805 Digital Multi-meter, and a PC compatible computer running Windows 98 SE.
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