If you rfeally hae to there iss no such thing as this the problem and
this is solution. You need many hours "cut and try type approach". First
off like using best cables you can get, even POE injectors are not
On Sat, 21 Dec 2013 01:02:42 -0700, Tony Hwang wrote:
With my cabling all less than 100 feet, it really doesn't
matter what POE I use with my three radios.
My Bullet came with a half amp 15 volt POE, and my
Nanobridge came with an amp 24 volt POE, and my
Rocket came with an amp 24 volt POE with its own
reset switch (which is really handy since the rocket
is on the roof).
In practice, since my cabling is so short, the POE
does not matter, as far as I can tell.
Something else *does* matter though ... :)
A bigger dish will help.
I was asking about the RF cable, not the Ethernet cable.
I think what you want to do is read up on the subject.
Here are some key words to search for info
-174 dBm / Hz
Spectrum analyzer noise measurements
Also it seems your real goal is to increase the data rate but you seem focused on the ex noise.
Don't forget,the link needs to go both ways. Step one is to determine which path direction is your limiting factor.
Have fun... Happy new year
On Thu, 19 Dec 2013 09:17:43 -0800, makolber wrote:
I *am* a bit concerned with the -88dBm noise level, but, I do agree
with you that I have a high-gain antenna and high power transmitter
with decent receive sensitivity.
What concerns me most about the -88dBm noise is that some of my
neighbors, using the exact same equipment and connected to the
same WISP AP, have 9 dB less noise!
Since every 3dB is doubling (or halving), I have 8 times the noise
that they have! That's mostly what concerns me.
It would be nice if others on a.h.r listed their noise figures, so,
we could take an informal survey.
My modem (actually it's a tranceiver, but, it's just like a modem)
is where I measure all this noise.
Can you guys get noise figures out of a cable or DSL modem?
On Thu, 19 Dec 2013 11:43:28 -0700, Tony Hwang wrote:
We are in mountains. Our roads are one-lane for miles on end.
Zoning in our area is 40 acres, so, if you have 79 acres, you
can only put one house on it (they don't want more people living
in the mountains - they prefer them all squashed together in
San Jose, which we can "see" (along with the smog above it).
Even though we're few and far between (we can't even see the
neighbor's houses) but we all know each other better than if
we lived in a city.
So we all know what the others have by way of Interner access.
None of us can get DSL because we are something like 30,000
feet from some switching station that we need. It's too far.
None of us can get cable because the poles out here only
have power and telephone. Nothing else is on them.
Luckily, we're high up, so, we have a fantastic view of
the sky. Satellite is no problem. Out here, both Hughes and
Viasat Exeed serve us. But, satellite, in a word, sucks, only
because of bandwidth limits and latencies. Mostly the bandwidth
limits. The speeds are actually pretty good. But, that bandwidth
limit is a killer.
Of course, we could use cellular modems, but, there is a better
solution for us. We use line-of-sight WiFi access points. Since we
can see both sides of Silicon Valley, we could put an antenna
up 30 miles away and see it easily by line of sight. In almost
The net is that we all have dish antennas bristling on our roofs.
They point at the local access points.
We have only four WISPs to choose from (that I know of), so,
each of us points to whatever WISP gives us the best deal.
Mine allows me to be unthrottled, which is great because I have
no bandwidth limits and I have no speed limits. If I can get
30Mbps, that's what I get.
My first radio, a Bullet M2, only got about 8Mbps (symmetric).
So I upgraded that to a Nanobridge M2, which got about 10Mbps.
Now with the Rocket M2, I get almost 20Mbps.
So, our investment in radios has a direct relationship to our
Internet speeds. Our "modem" is the radio (aka, the transceiver).
BTW, I'll ask you a question about you cabin in the next post ...
On Thu, 19 Dec 2013 11:43:28 -0700, Tony Hwang wrote:
Satellite is fast, but sucks due to bandwidth & latency
If your cabin can use WISP, that's what I suggest.
What you need for WISP is line of sight to the access point.
From your cabin roof, can you *see* anywhere that does
have cable Internet access?
If so, you can home-brew up a fast Internet access easily.
Of course, there are *many* solutions, and the best is to
find a WISP access point that you can visually see ... (which
is what I do).
But, by way of example, let's say that 25 miles away, you
can see a friend or relative who has cable access. Remember,
you must *see* the area. Of course, even at about 3 miles,
I can't actually pick out my WISP antenna, but, I can scan
the area with binoculars enough to know I'm pointed roughly
at it (at 3 miles, my 5 degree beam is 1200 feet wide in
both horizontal and vertical directions).
At 25 miles, your beamwidth will be fine if you're anywhere
Then what you do is buy a pair of radios that cost about $100
in total, plus another $100 (or so) for mounting equipment, and
another $50 or so for cabling.
So, for roughly $250, one-time cost, you can establish a link
that easily transmits that cable Internet access from the
populated area to the rural area of your cabin.
The great news about that is the $250 is a one-time fee, so,
if you divide that over it's useful life (10 years?), it's
about $25 a year.
In summary, it's really easy to transmit WiFi from one place
to another, with the huge caveat that you need line-of-sight
between the two points. Hope this helps you with your cabin.
On Thu, 19 Dec 2013 19:42:37 +0000, Danny D. wrote:
Just by way of another example, I can see all of San Jose, so,
out of the million people down there, I could find one willing
to beam their high-speed Internet to me, simply by adding a
radio to their roof and to mine.
(In effect, that's what I do, except I'm paying my WISP to be
that other antenna.)
The fact it's so easy and cheap (nowadays) to beam an Internet
connection a dozen miles, makes me wonder why more people don't
Of course, the caveat is (and always was) line of sight is
needed, although not having LOS is easy to solve with repeaters.
Here in Alabamastan we actually have a state college, The University of
Auburn, which is both the premier agricultural and engineering school. I
traveled to Auburn one year to visit some friends and drove past "The
Swine Research Unit". The smell could gag a maggot but the pigs were
happy. In the mid 1960's at The University of Alabama, I started playing
with and learning a tiny bit of Basic and Fortran in order to play with
the Univac which was on its way out and the new IBM 360/50 RAX system
which was replacing it. Kids these days have no idea how user friendly
computers are now compared to what I started playing with like the
analog computer at my school but I really believe computers were more
fun all those years ago. Now they're tools, not so exclusive anymore and
any kids gaming computer has much more computing power than what was
considered a super computer at one time. ^_^
You guys are little bit behind me, when I was into it during and after
school, computers were called electronic calculator as such containing
vacuum tubes, mechanical relays.. from there transistors, small scale IC
all the way into nanotech which is now. I used to use blank punch card
with columms and rows all half pre-punched so we can push the confetti
out to make holes where we want to do Fortran programming. If you drop
the card deck by accident, you have to resort one by one to make them in
proper order before you can have it read. Also remember 51 column card?
Credit card receipts were 51 column card size which could be read after
they are punched by key punch operators(girls) reading the amount
written and imprinted account number. My Ham radio hobby was from the
'50s, licensed in '60. Hold Extra U.S., Advanced/Digital Canadian,
First class Korean licenses. Right now I am busy resetting up our HT
system into 7.1 with new AV receiver and speakers. Better be done before
We must pass our knowledge and skills on to a younger generation because
they are being lost. If our modern society crashed, most people would be
helpless because they have no idea how older simpler technology
works. Perhaps Boy Scouts could help people survive? o_O
20 years ago, I was working on the chilled water system at a bowling
alley when a 10 year old kid walked up to the counter and asked the
counterman if he could use the phone to call home. The fellow reached
under the counter and set a rotary dial phone in front of the kid and
the kid had no idea what he was looking at much less how to use it. ^_^
On Wed, 18 Dec 2013 22:59:04 -0600, The Daring Dufas
Punch cards were for the CS weenies. ;-) The real nerds had
slip-stick scabbards hanging from their belts (I carried mine with my
books). Over my senior year, the slip-sticks were being replaced by
calculators (and holsters for scabbards ;-). I bought an HP, and yes,
it was $400 (about 10-weeks gross pay).
On Thu, 19 Dec 2013 11:45:23 -0600, The Daring Dufas wrote:
My Dad, bless his heart, taught me how to use a slide rule
when I was in high school trig class. His was bamboo and white,
as I remember it. He bought me a smaller one, and I cherished
it. I hope I still have it, but, I've moved a half dozen times
since so it's somewhere.
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