Ok guys I will do the experiment. I believe I know the answer but validation is always a good thing. Here is what I will do: 1.) Start with a #10 or #12 self supporting copper wire dipole that is abo
Here are the results of the experiment: 1.) Dipole was made with #10 bare copper wire each side 12.0" long. 2.) Disks are 2.02" diameter x 0.01: thick copper with hole in center for #10 wire. 3.) 8ft
Yikes! I have received several personal comments since I posted the results. I guess some folks don't want to comment publicly. I did the test since the arguments being made weren't proving anything.
Darn, I just finished cleaning up the experiment and it is now in the trash. I didn't think there were any follow up test to do. I did the test at 33% and 66% of the distance from the center and am q
We generally think of PI networks as "low pass" and Tee networks as "high pass" but there are PI networks and Tee networks of both "low pass" and "high pass" topologies. A low pass PI network (CLC) a
Please re-read the results of the experiment. Tests #3 and #4 did exactly what you are suggesting. Larry, W0QE _______________________________________________ Amps mailing list Amps@contesting.com ht
I also agree that the AADE L/C meter is a great deal and a very easy kit to build. Bear in mind that the measurement frequency used is NOT RF but a variable frequency that I think goes as high as a f
Occasionally I wish to Hipot some parts such as relays or capacitors. Has anyone ever seen a factor relating 60Hz breakdown voltage to RF breakdown voltage in the HF range? The only thing I seem to f
Here are some real numbers I just measured on a network analyzer calibrated at the plane of the core being measured. Core = T94-2 powdered iron u=10, 22 turns #18 occupying about 80% of core Msmt. fr
Jack, K8ZOA wrote a very in depth review of the AADE L/C IIB recently. The link was published here a few days ago but here it is again http://www.cliftonlaboratories.com/aade_l_c_iib_meter_review.htm
Thanks for the plug Dan. I did the tests you mentioned primarily at 28MHz a couple years ago. Increasing the wire size 1 gauge is better than silver plating assuming you have adequate spacing between
What are you using as the basis for this blanket comment? There is absolutely nothing wrong with tapped toroids. What causes problems is treating them as is usually done for air core coils which have
Jim, Yes the comments hold true period! Flux in any core with shorted turns will cause extra loss with the exception of a type -0 core which has u=1. I have seen shorted turns on a toroid core causin
Another vote would be for the Schrack/Tyco RTD14012F relay. It is 16A and sells for only a little more than the relay Dave mentioned as a P&B branded relay. It is also available in an orange shell wi
Carl and Denny, Hope you don't mind me butting in here. I had a private exchange with another guy and will post an experiment I did here as it might help. This following reply was in reference to a p
David, It doesn't! Look at the relay specs closely and you will see that very few relays have any gold in the contacts if they are rated above a few amps. I spec'd the use of 10's of millions of rela
Jim, W8ZR recently mentioned his preference for the RTB140XX 12A relay over the RTD140XX 16A relay for switching legal limit RF. His preference was because the RTB relay only uses 1 pin per contact c
Take a look at http://www.bnk.com/w0qe/inductor_Q_tests.html where I made a bunch of measurements. Silver is a 7% better conductor than copper but at RF the skin depth is inversely proportional to th
Vic, Be careful as the attenuators are rated for dissipation and not power input. Therefore a 50W 3dB attenuator is usable with a 100W input where a 50W 6dB attenuator is only usable with a 66.7W inp
Don, I use an ignition transformer for a fuel oil furnace to test breakdown voltages. These are 120VAC primary and a grounded center tapped secondary of 6kVAC to 12kVAC. They are readily available, a