7MHz calibration signal generator, 0dBm and -60dBm

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A simple junk box signal generator with precise 0dBm and -60dBm, original design by Thomas DL7AV and modified by me to suit available parts in my junk box.

NOTE: As pointed out by Phil N6WKZ (thanks Phil): the resistors in the 0dB attenuator section are both supposed to be 39 ohms.
  1. QRP Labs
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Комментарии
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Hans, I really enjoyed watching this video. I don't have a use for this project but I did enjoy watching you explain all that you did and the steps you used to check it's accuracy. thank you.

deanberglund
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Hans, I was working on a 26th anniversary NorCal 40 project about three years ago and fell in love with N6KR (Wayne Burdick's) little rig. He had that 50-ohm formula in his troubleshooting notes. Before that, like you showed, I went through the tedious multi-step processing of calculating power from Vpp. Once I resurrected some truly rusty algebra skills, I never looked back. It's great to calibrate QRP wattmeters. You cannot believe how incredibly accurate the Diamond SX series are!

warplanner
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Good project and thanks for video Hans. I like that Vpp squared divided by 400 formula for a 50 ohm load. Will try to remember that to save time calculating power from scope waveform 🙂. Also, good that you were able to modify the design to use your junkbox components.

Steve-GMHUU
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Neat! Make it a kit and I'll buy it. AFTER I can buy a QSX of course. :)

julianwhite
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Great build. This video will help inspire more confidence in your eventual QSX kit. Thanks a bunch

davidniemi
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I really appreciate the detail in your comments.. Thanks!

steveo
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Great video. Sometimes though your audio level is very low. It would be nice if you could improve that for your older viewers with limited computer setups

radiolens
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Your workbench..

"The Day After"

warplanner
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"one clock, two clocks, etc."

Juvenal said it best:

*Quis custodiet ipsos custodies?*

warplanner
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nice work. what is the ppm of this? to make a calibration source, 0.5ppm is expected. the gps 10Mhz sources these days have come down in price, and sorry a gps referenced oscillator is the my standard.

TheGmr