why are they yagi antennas on some bridges.
 

does any body no why .i have seen a cross yagi type beam along the
bridge .my guess will be to monitor the water level umm maybe not
73s not really a pirate ok only on the sea

USGS installs these monitor sites for the water level, temp etc.....

You are correct

C.




In article ,
(Free radio) wrote:

does any body no why .i have seen a cross yagi type beam along the
bridge .my guess will be to monitor the water level umm maybe not
73s not really a pirate ok only on the sea

"C." wrote in message
...
USGS installs these monitor sites for the water level, temp etc.....

They usually seem to be pointed up into the sky (towards some satellite); is
there information available about these satellites, their downlink
frequencies, format of the data, etc.?

They usually seem to be pointed up into the sky (towards some
satellite); is there information available about these satellites,
their downlink frequencies, format of the data, etc.?



There are a zillion remote weather stations all over the country.
Many are for specific purpose such as providing info for Fire weather,
snow pack levels, and as you have seen, stream flow guages for water
management and flood control. Some of the remote weather stations
(RAWS) can be seen listed at:

http://raws.boi.noaa.gov/rawsidx.html

Do a Google search on "RAWS" weather data. Also, stream flow
stations and remote snow pack stations can often be found on your local
State's water management department.

Bottom line answer to your question, YES, the data you probably
would like to see is available on the Internet.


Ed K7AAT

I have never asked when the tech was working on the system, original
install or serviceing it. I have only stoped to check on him while at
work. In the days of this we have to watch out for the homeland security.

He stated that it worked off of low oberting satatlites but as far as
frequency range I never asked. Drive by and chck with a frequency counter
and see what comes up. It will be all packet data, with short transmit
times.

C.



In article , "Joel Kolstad"
wrote:

"C." wrote in message
...
USGS installs these monitor sites for the water level, temp etc.....

They usually seem to be pointed up into the sky (towards some satellite); is
there information available about these satellites, their downlink
frequencies, format of the data, etc.?

"Free radio" wrote in message
...
does any body no why .i have seen a cross yagi type beam along the
bridge .my guess will be to monitor the water level umm maybe not
73s not really a pirate ok only on the sea


In the Illinois, I see 2 primary systems.

The cross yagi - pointed skyward is for satellite reception of the data
[southern sky - about 40 degree angle] for water levels of watersheds,
streams and rivers. You will usually see them at dams, some bridges or
confluences of streams/rivers.

The Dept of Transportation in Illinois (and many other states) have small
weather stations along the tollways, interstates and major 2 lane highways
for weather conditions throughout the state. They will have a small UHF
yagi and it not unusual to see these small weather stations high traffic
areas or bridges. Bridges allow for additional sensors to measure freezing
conditions on bridges or water levels in flood prone areas (cooperatively
sending data to NWS and other services).

The Army Corps of Engineers also has a number of stations for the Illinois
and Mississippi River watersheds, for proper control and management of the
lock and dam system above St. Louis (St. Louis, Rock Island, Omaha and St.
Paul Districts).
http://www.mvr.usace.army.mil/

Many of these gauges are cooperatively managed by the Army Corps and other
federal, state or municipal agencies, such as: USGS, NWS, universities.
This specific gauge is at the Hydraulics Laboratory (on the Iowa River) at
the University of Iowa in Iowa City, IA
http://www2.mvr.usace.army.mil/Water...fid=IOWI4&dt=S

gb

it is a wonder no one has stoled any of the antennas on side of the
bridge a free ant i am not that brave

They usually seem to be pointed up into the sky (towards some
satellite); is there information available about these satellites,
their downlink frequencies, format of the data, etc.?


All the satellite weather/water data ground stations I can think of use
an uplink of around 401 MHz. (There is NO downlink to these ground
stations; their TX is controlled by clock controlled TX time slot.)

The government geostationary satellites, like GOES 7, are downlinking
the data to a Central site in Virginia on around 4 GHZ, I think, and
higher. From there, the raw data is processed and sent back out to
several differnet locations, including more satellites for relay.




Ed

" Why are they yagi antennas on some bridges?"

Why are "they"???

HUH?

Ron

"They" reports how high the river, stream be! Not how deep, just how
high. They look really cool perched up there too!
Butch Magee KF5DE

Ron, KC4YOY wrote:
" Why are they yagi antennas on some bridges?"

Why are "they"???

HUH?

Ron