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First of all I'll editorialize by saying this is a paranoid fear unless she
frequently travels to areas of very high RF field intensity. Secondly, a 'wearable' instrument will be a compromise, at best. A real spectrum analyzer with a calibrated antenna is what you need for 'accurate' frequency-dependent measurements. End of editorial. The simplest way I can think of to do this job is to use the Analog Devices 8307 log detector IC. This chip has an accurate 90 dB measurement range that goes down into the microvolt region and operates to over 1Ghz. If you built a series of these detectors, each one with a broad bandpass filter front-end for the appropriate frequency range, then you could measure all the log output DC voltages with a PIC processor and light up LED indicators when a threshold limit is exceeded. As an embellishment, you might arrange a set of, say, 6 bar-graph LED modules oriented in a vertical position side-by-side with each other. This would provide a crude spectrum analyzer display. Joe W3JDR "Ed Bailen" wrote in message ... My wife recently had a defibrillator implanted. The folks that manufactured it kindly sent her an email discussing the varoius bands and field strengths it had been tested against E field and H field). She is concerned about exposure to RF both from our mobile VHF and HF operations, and from the un-shielded multi-gigahertz processors in her lab. We would like to come up with an absolute (not relative) field strength meter that we can use to evaluate field strengths (mainly E field) at various frequencies. I could not find anything on Google. I can cobble something together wirh an antenna, a tuned front end, a detector, and a peak sampler, but how to calibrate it? Any suggestions? TNX Ed Bailen - N5KZW |
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