Transcription of A Power Meter based on the AD-8307 from Analog Devices.
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A Power Meter based on the AD-8307 from Analog Devices.
A Power Meter based on the AD- 8307 from section relates to the QST paper that Bob Larkin (W7 PUA) and Ipublished in QST for June, 2001 Update, 10 Mar07, 5 June07 Calibration at the Frequency March 07, 5 June07I discovered a problem with the version of the Meter at had beentrying to build a wide frequency range return loss bridge and had seen problemsat the high end, between 400 and 500 MHz, the upper limit of had been using the homebrew Power Meter to measure theOpen to Short ratio over the to 500 MHz spectrum.(See the bridgediscussion in EMRFD.)I finally borrowed a HP435 Power Meter with a 4 GHzelement from a local friend to check the output accuracy of my HP8640 Bsignal generator and to then study the accuracy of my homebrew Power first conclusion reached is that the HP8640B signal generator is extremelyaccurate with regard to output Power versus that indicated by the front accuracy seemed to only be limited by the resolution of the has been my experience with other HP signal checkedcalibration at 10 and 500 MHz, and a few frequencies other conclusion is less calibrated the AD8307 basedpower Meter at several frequencies and found that the calibration wascompromised at the high results I got at 10 MHz and at 500 MHzare plotted that the points at the high end are not on the linearcurve fit line at higher powers at 500 points are not evenly spacedlike
A Power Meter based on the AD-8307 from Analog Devices. This section relates to the QST paper that Bob Larkin (W7PUA) and I published in QST for June, 2001
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