In article ,
says...

"rickman" wrote in message
...
On 2/22/2016 1:57 PM, Ralph Mowery wrote:
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.

http://www.rfcafe.com/references/art...hak-6-2014.htm

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!

Jamie