[600MRG] More on HADGPS

[david vanhorn]

Thanks for the info.  I design avalanche beacons which operate at 457 khz.
I will need to check this out.

On Sep 22, 2017 7:08 PM, "Paul Signorelli" <w0rw1 at msn.com> wrote:

> Some more thoughts on HADGPS.
>
> The High Accuracy DGPS station in Pueblo CO (458 kHz) previously mentioned
> is probably a spin off of Falcon AFB.
>
> It is causing interference to the new 630 meter ham band in surrounding
> cities (S8 on 472 Khz at 40  miles).
>
> This is a test bed facility so there is probably no worry that a wideband
> MF  data transmitter will be in your backyard any time soon. It had been
> used for DGPS testing in the past at about 100 bps that didn't occupy 50
> kHz. Now it is using a high data (1000 bps)  but I think it only has a HA
> range of a few hundred miles.
>
> LORAN had better range and they shut it all down because it was too
> expensive to maintain.
>
> There were about 75 LORAN stations, (there were many different types of
> LORAN A, B, C, etc).
>
> If this HADGPS is going to work there would have to be a big
>
>  transmitter in every city/place where they wanted to use it. That would
> be very expensive.
>
> If they did that they would probably need all the MF spectrum available.
> They would not put all them on
>
> 458 KHz. Of course they could not proceed without the UTC's approval.
>
> These are just my speculations, I have no insider information.
>
> I am going to have to build a loop to null this thing out.
>
> Paul   wa2xrm
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