Hi Mikek,
Making a stand alone voltage ratio Q Meter with range up to 150MHz does
not seem realistic. Limitation is volt meter frequency range. HP-400E
and home-brew voltmeter is limited to about 10MHz.
I'm not sure I have the ability to home-brew a RF voltmeter with
frequency range much above 10MHz. Can not use a HP400E as a back end
detector and meter display because of it's 10MHz BW limit. Therefore,
whatever is designed requires front end to RF detector.
I am testing high Q inductors and will post to the list later today.
Today is a peak Q=600 device. I also have a nominal peak Q=1200 device.
John KN5L
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On 9/27/22 8:15 AM, Mikek wrote:
John KN5L,
?So far it looks like you are the only one to have actually run with the
ball.
?Do have any thoughts about actually building this in an instrument?
As always once you get to 1MHz and up strays become
important to minimize, but, apparently a Q meter can be built that does
this.
? I ask because, I would want a variable capacitor, I would also have a
difficult time
measuring a 6 inch diameter coil on the small pcb you have.
?I made the suggestion that unless we can find a better way to make the
50 to 1 transformer so it is wideband,
?we may have to have 3 switchable transformers for low, medium, and high
frequencies. The OPs design goal was
1.5MHz to 150MHz. I received no response on the idea. I have enjoyed
this thread and your posts.
?????????????????????????????????????????????????????? Mikek
