Looking at the chart of loss vs. frequency for Belden 1694A Coax I see
0.24 dB at 1 MHz, > 3 dB at 270 MHz and > 6 dB at 1000 MHz. I don't see any factor for frequency in I^2R. I suppose this could be skin effect increasing the conductor resistance.
How do you tell when the losses are mostly due to the dielectric?
If you really want to get into it, here is a place that gives the info. Lots of math to look through. Much easier just to look at the chart for a good indication of where the losses are.
Or I could go into the archives at work "Brand-Rex", and get the original designs specs and charts. Yes, those were the days.
We just retired the very first irradiation cross linking line ever made for production use of any product. The actual first cross linker irradiation unit for non commerical use was for the airforce, in a hanger.
Our unit now sits on the floor waiting for a home in some antique shop, 170k Watt version. It was getting hard to find chips to keep it operating. Many BB chips, round can op-amps. The osc for the magnetic amp was a UNI transistor that drove a transistor Flip Flip to generate a
100Hz sweep for the amp. In that circuit was wave shaping components to get a step peak on the out sides of the sweep before it changed direction.
Neat stuff for back then, real engineers not uC coders!
They are OK, if you know how to use them. With RG8, I would tin the braid, then use a small tubing cutter to trim it to the right length. Then I would drill the plating out of the four holes before soldering the shell to the braid. I never had one fail, when I used that method. Of course, it made it difficult to reuse a connector without heating the shell over an open flame for a few seconds so that you could pull out the old braid.
I had some CBer swear that he could pull the PL259 off of any piece of coax. You should have seen his hands after he tried it on one of my cables. :)
I switched to the silver plated type and usually put in a few drops of liquid flux to help out.
For the last several years I switched over to the crimp on types and have not had any problems with them.
I doubt the connectors were ever designed to have much force applied to them. If I use them at an antenna I find a way to take much of the force off the connector.
Motorola used them on mobile and fixed end equipment for the longest time. Then on fixed end they mostly went to N-type. Then they went to the mini PL-259 on mobile units which are really junk. Anything for a buck I guess.
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