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Today I built up my coax s/n 008 out of experimental
bits and scraps.
A hybrid between the original and the coax kits I made.
The hairpins were tucked under the coax tube bases (not into
the bottom plate) and tacked in place with silver solder.
The inner coax tubes were pretty bashed around and not smooth
The Base and Top were baked on the gas stove with solder
Loss @ 1013 -6db
-3db 2.6 MHz wide
-60db 11 MHz wide
-90db 25 MHz wide
Note: The hair pin spacing to the wall is
super critical and the inner post lengths are critical too.
Even tough some small amount of solder
leaks into the base of the coax tube (around the tube edges) with the solder paste
bake process it does not seem to hurt.
My 2 year old coax #2 done as per original process and tested
independently by Rex Pearson in Queensland (a state in Australia)
Many thanks to you Rex.
3dB bandwidth 3.42Mhz Return loss ~ 9.5dB
-30dB bandwidth 7.76Mhz
-60dB bandwidth 21.04Mhz