Hi Ron
Times Microwave also makes a similar coax to RG142 called FBT-600.
This coax was designed for high power jumpering.
FBT-600 coax is flame retarding in nature,,, designed for running in ceiling
and wall cavities. It has impressive power handling capabilities like RG142 and
RG393.
I picked up a box of FBT600 jumpers at a hamfest, it came from a TV station. I
chopped them up to make some 4:1 baluns.
Craig
### FBT-600 is VERY expensive new.. like $13.00 per foot. It's the teflon
version of LMR-600, but with a twist.. It doesn't use the huge 5 1/2 ga
center conductor like LMR--600 does. [ aprx .176"] FBT-600 uses a smaller
center conductor.. aprx .15" I considered it's use for a specific
application
at one time. Here's my beef with it. Only available connector's for it
are Type N... and also LC. LC's are fast going out of vogue.. and a Type N
doesn't
even make it to my short list. Times microwave does not make a 7-16 DIN
for FBT-600. Dunno if anybody else does ?? 7-16 Dins are plentiful.
LC's are a real pain.. and very expensive. 20 kw into 50 ohms = 1 kv rms /
1414 v peak. 7-16 DIN connector is rated for 2800 v rms 4 kv peak.
An LC connector is rated a lot more. Center conductor on a 7-16 DIN is a lot
bigger than a LC. The 2" square flange on a female chassis LC
makes for huge, expensive connectors. .. like right angle LC's, etc.
## RG-393 is super expensive... cuz it has silver plated 13 ga center
strands. It also has TWO x silver plated braids. Outer jacket
Is FEP-9 which I think contains PTFE .. or is ptfe. If somebody had
just made a simple teflon version of RG-213... it would have been
ample. The loss on 393 is .98 db vs 1.0 db @ 30 mhz. All that silver
plating and FEP-9 outer jacket does is... add huge cost.
later....... Jim VE7RF
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