On 07/08/10 17:32, Gene Heskett wrote:
>
> Absolutely Bob. About the practical Maximum Usable Frequency of coax is in
> the 2.2 Ghz range, and that is for 1.625 inch heliax or better yet, rigid.
> About $7 to $12/foot, used. I have used smaller stuff, but at 1.5Ghz
> ranges, with buckets of powered gain on the sending end, it can make it 300
> feet still strong enough to drive a 950-1450mhz satellite receiver over
> quad shielded RG11. Those teeny little cables they put on so-called 7DBI
> antennas actually have a loss of several DB/meter. I have one of those,
> tested at about + 0.5 DB over the cards rubber ducky at its best placement.
> Needless to say, any connectivity I have in the attached workshop,
> separated from here by 3 walls, one of which still has the alu house siding
> on it, is by way of a 150 foot cat5 cable to the outbuilding my cnc mill is
> in, thru a 100base-t hub out there, and another 100 foot of cat5 across the
> yard and in a side window of the garage. PIMA, but it works. That first
> 150 footer has been strung overhead, swinging in the wind for at least 6
> years now, and in fact survived a wind on June 24 that took down 3 of the 5
> mature trees on my property, and measured 112 mph on a recording anemometer
> about a block away, downwind. I am amazed that a common piece of Belden
> blue cat5, right out of a 1000' box, is still working, but it is.
>
> [root@coyote linux-2.6.35.1]# ping shop
> PING shop.coyote.den (192.168.71.4) 56(84) bytes of data.
> 64 bytes from shop.coyote.den (192.168.71.4): icmp_seq=1 ttl=64 time=1.76
> ms
> 64 bytes from shop.coyote.den (192.168.71.4): icmp_seq=2 ttl=64 time=0.142
> ms
> 64 bytes from shop.coyote.den (192.168.71.4): icmp_seq=3 ttl=64 time=0.140
> ms
>
Those look like good numbers, better than I am getting through 15 ft
and a gigabit switch. I hope the format doesn't get mangled?
[bobg@box9 ~]$ ping -c3 192.168.1.48
PING 192.168.1.48 (192.168.1.48) 56(84) bytes of data.
64 bytes from 192.168.1.48: icmp_seq=1 ttl=64 time=0.796 ms
64 bytes from 192.168.1.48: icmp_seq=2 ttl=64 time=0.144 ms
64 bytes from 192.168.1.48: icmp_seq=3 ttl=64 time=0.161 ms
--- 192.168.1.48 ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2000ms
rtt min/avg/max/mdev = 0.144/0.367/0.796/0.303 ms
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