Just 4 turns. The idea and constructive details came in 2015 from Jim Giammanco N5IB, the original designer of the PHSNA.
Ignacio
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El 28/06/2023 a las 19:15, Mike escribió:
On Wed, Jun 28, 2023 at 04:57 PM, EB4APL wrote:
Hi, I still keep a true GDO but I had nor used it for a long time.
When I built my Poor Ham Scalar Network Analyzer some years ago, I also
built a pickup coil wound in an old 35 mm film canister with a BNC
connector. I connect it to the Return Loss Bridge? and used it as a GDO
but much more convenient. When I got the nanoVNA I tested it with it and
the results are very good, you can measure the resonance of any? circuit
without physically connecting to it.? I uploaded some pictures to the
Photos section.
Ignacio
Nice job Ignacio. How many turns on your pickup coil?
I had to wind my pickup coil around the end of the inductor to get enough coupling for a response.
The dip is fairly close to the SRF estimated by Coil64, which was 15.58MHz.
Pictures attached.
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