On 4/24/16 9:35 AM, Jim Thomson wrote:
Does anybody know anything about RG-304 ? Its aprx .271 OD.... and has
teflon + silver braids /center conductor.
Im having a helluva time trying to find out what gauge the center conductor is.
Does anybody know ?
I think 304 is sorta the teflon version of RG-8X, and aprx the same OD.
If you can wind RG-58 and also possibly RG-8X onto a stack of torroids,
then there should be no issue using RG-304.
IF 304 has a bigger center conductor than 303 /400 coax, then it might be an
excellent candidate for applications
where a high powered CMC is required. RG-393 is .392 OD.... slightly less
than the .405 found on 213-U.
I’m looking for a possible alternative to 393, but cant find any V rating,
power ratings or attenuation charts for 1-54 mhz...for 304 coax.
voltage rating is almost entirely determined by physical dimensions and
whether the dielectric is solid, foamed, or something else.
ditto with the current/power rating (mostly a thermal dissipation limit)
So if you can find something else with similar dimensions and
construction that would probably work. the breakdown voltage of various
plastic dielectrics are similar enough, and in any case, it's the tiny
voids and the e-field that really determine breakdown: inner conductor
diameter and spacing sets the field in V/m
attenuation, for HF, is mostly IR loss, so if the material/plating
thickness of the inner and outer conductors are the same, the loss will
be similar.
I have also looked at some of the plenum rated small coax, but the price is sky
high...and difficult to locate in small qty.
Jim VE7RF
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