On 12/10/11 7:46 AM, George Dubovsky wrote:
> Dunno, Dave, but I ran into something that sounds like that, about 30 years
> ago. The center conductor was something with measurably higher resistance
> than copper. I was told it was for making delay lines - useless for normal
> transmission line use.
>
The delay line stuff actually has a spiraled inner conductor (to
increase the series L (so that sqrt(L*C) is big), so a foot of coax has
a lot more than a foot of (very small diameter) copper wire in it.
Since Z is sqrt (L/C) that also makes the impedance of the line high (I
seem to recall around 1000 ohms)
> 73,
>
> geo - n4ua
>
> On Sat, Dec 10, 2011 at 10:13 AM, K1TTT<K1TTT@arrl.net> wrote:
>
>> Grabbed some stuff they were going to throw away at work. no type marked on
>> it, only mfg info is "IT&T Federal Cable REC". Looks almost new so thought
>> it might be good for something. About the size of RG-6, but has thinner
>> center conductor, partial air dielectric, and very tight single layer braid
>> shield. Odd part is that it has very high loss. maybe some kind of early
>> version of RG-126 or RG-301?? Any idea what this might be used for?
How did you measure the loss? If it had a real high Z would that look
like high loss?
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