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Science Forum Index » Electronics - Design Forum » Ethernet over VHF
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| ok |
 Posted: Mon Feb 26, 2007 2:31 am |
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Guest
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Hi
I need to setup up a remote link using VHF for ethernet network.
Frequency license is obtained already for a specific frequency within
range of 130MHz - 180MHz . Can some one advice on possible solution
with links to industry approved devices/products.
Regards
Khan |
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| John Barrett |
| Posted: Mon Feb 26, 2007 3:49 am |
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Guest
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"ok" <omeruk@gmail.com> wrote in message
news:1172472610.120145.313510@m58g2000cwm.googlegroups.com...
Quote: Hi
I need to setup up a remote link using VHF for ethernet network.
Frequency license is obtained already for a specific frequency within
range of 130MHz - 180MHz . Can some one advice on possible solution
with links to industry approved devices/products.
Regards
Khan
HMMMMMMM
google VHF DATA RADIO, the TNC-X packet modem (or any other 1200 baud packet
modem, there are several.. TNC-X is just the cheapest), and the "AGW Packet
engine" for your ethernet to VHF bridge -- that will get you 1200 baud off
the shelf with minimal construction issues -- (installing antennas,
configuring radio, connecting packet modem, installing and configuring AGW)
if you need higher data rates, then I need to know how much bandwidth your
license allows you to use, and it will probably NOT be an off the shelf
solution !!
There is, to the best of my knowlege, NOTHING as an all-in-one package for
tcp/ip over VHF -- you are going to have to piece the parts together one way
or another !! |
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| PeterD |
| Posted: Mon Feb 26, 2007 10:13 am |
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On 25 Feb 2007 22:50:10 -0800, "ok" <omeruk@gmail.com> wrote:
Quote: Hi
I need to setup up a remote link using VHF for ethernet network.
Frequency license is obtained already for a specific frequency within
range of 130MHz - 180MHz . Can some one advice on possible solution
with links to industry approved devices/products.
Regards
Khan
What are the technical specs of the license: Frequency, center
frequency, bandwidth, modulation type, etc. |
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| Tam/WB2TT |
| Posted: Mon Feb 26, 2007 10:56 am |
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Guest
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"ok" <omeruk@gmail.com> wrote in message
news:1172472610.120145.313510@m58g2000cwm.googlegroups.com...
Quote: Hi
I need to setup up a remote link using VHF for ethernet network.
Frequency license is obtained already for a specific frequency within
range of 130MHz - 180MHz . Can some one advice on possible solution
with links to industry approved devices/products.
Regards
Khan
The use of these frequencies would be illegal in most of the world; so, I
doubt that any commercial equipment exists. Why not use WiFi? It is cheap.
Tam |
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| Joel Kolstad |
| Posted: Mon Feb 26, 2007 2:34 pm |
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"Tam/WB2TT" <t-tammaru@c0mca$t.net> wrote in message
news:H7OdnZoqBrqVaH_YnZ2dnUVZ_oupnZ2d@comcast.com...
Quote: "ok" <omeruk@gmail.com> wrote in message
news:1172472610.120145.313510@m58g2000cwm.googlegroups.com...
Frequency license is obtained already for a specific frequency within
range of 130MHz - 180MHz .
The use of these frequencies would be illegal in most of the world
doubt that any commercial equipment exists.
Probably true. Note that -- at least in the U.S. -- that is a standard
military band, so there probably is plenty of military gear available... with
the typical military price tag as well, of course. |
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| Tam/WB2TT |
| Posted: Mon Feb 26, 2007 4:17 pm |
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"Joel Kolstad" <JKolstad71HatesSpam@yahoo.com> wrote in message
news:12u6a1s54nai4e7@corp.supernews.com...
Quote: "Tam/WB2TT" <t-tammaru@c0mca$t.net> wrote in message
news:H7OdnZoqBrqVaH_YnZ2dnUVZ_oupnZ2d@comcast.com...
"ok" <omeruk@gmail.com> wrote in message
news:1172472610.120145.313510@m58g2000cwm.googlegroups.com...
Frequency license is obtained already for a specific frequency within
range of 130MHz - 180MHz .
The use of these frequencies would be illegal in most of the world
doubt that any commercial equipment exists.
Probably true. Note that -- at least in the U.S. -- that is a standard
military band, so there probably is plenty of military gear available...
with the typical military price tag as well, of course.
He says ethernet; so, I assume he wants to go somewhere between 10 and 100
Mb/s. Probably ~50 Mb/s, to be consistent with the 50 MHz bandwidth. He
can't go below 137, which is the top of the civil aircraft band. 144 - 148
is no good, that's a ham band. There is police and fire around 150 - 160,
and TV starts at 174.
Tam |
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| Joel Kolstad |
| Posted: Mon Feb 26, 2007 4:23 pm |
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"Tam/WB2TT" <t-tammaru@c0mca$t.net> wrote in message
news:Te2dnYOg_NKy3X7YnZ2dnUVZ_h-vnZ2d@comcast.com...
Quote: He says ethernet; so, I assume he wants to go somewhere between 10 and 100
Mb/s. Probably ~50 Mb/s, to be consistent with the 50 MHz bandwidth.
I'm hoping it is close to 10Mbps, or what he really means is just that he
needs something with an Ethernet interface but the actual data rate can be
more like 1Mbps. Trying to squeeze 50Mbps into the VHF band is just asking
for interference complaints from everyone. As you point out, the military's
138-174MHz chunk has various "holes" in it anyway, and while fancy radios
these days can avoid those areas, it still takes plenty of effort and he
clearly needs to give us some more information on his design. |
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