[Scan-DC] Federal Interagency Hydrologic Radio Frequencies logged

[John Wilson]

They are part of the IFLOWS system.  They are rain gauge and water depth 
packet transmitters typically located on mountaintops or near streams or 
in other flood prone locations.   In Virginia IFLOWS is mostly in the 
western part of the state.  The packet transmitter signals are destined 
for an IFLOWS reception site that typically is a city PD, county sheriff 
or EOC.  If the signals cannot be received via line of sight they are 
microwaved via the Va. State Police transmitter sites or cross frequency 
relayed on VHF using line of site mountaintop repeaters.  Eventually all 
of the IFLOWS information terminates at the NWS in Washington, DC.

 The IFLOWS website has the current frequencies and locations.  The 
IFLOWS technicians also use the backbone vhf radio net NBFM.  I've heard 
them on several 171 mhz. frequencies.  The best signal for me is from 
Bear Den Mtn. near Charlottesville, Va.   In Va. the IFLOWS headquarters 
is at the Tri City Airport, Blountville, TN.   A FCC license to a city 
or county in the 169, 170 or 171 mhz. range with few exceptions will be 
IFLOWS frequencies.  Transmitter power typically is 6-8 watts.

 No, IFLOWS uses proprietary software and you cannot decode it but you 
can see almost real time readings for various IFLOWS locations at the 
website.

jay dehm wrote:

> -- All frequencies FM --
>
> Federal Interagency Hydrologic Radio Frequencies logged from my QTH
> within the last 30min
>
> 171.025
> 171.125
> 171.825
> 171.850  ** The rest of the freqs were faint and seemed to poll every
> 3-5 sec. This frequency I received loud and clear and was busy
> non-stop **
>
> Jay
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