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[aprssig] Automatic omni DF query

Chuck Gooden Chuck.Gooden at comcast.net
Tue Feb 10 11:45:53 UTC 2009

If I am not mistaken, AM is used on 121.5 and Doppler systems will not 
be effective on AM signals.

Rick Green wrote:
> On Mon, 9 Feb 2009, Scott Miller wrote:
>> Before anyone asks, these particular units won't work for 121.5 - I've
>> only been able to get them to receive as low as 127 MHz.
>    That's a moot point anyway - I just read on another site that the 
> government has announced the discontinuance of satellite monitoring of 
> 121.5 and 223.0, obsoleting a huge 'fleet' of ELTs., so all the boaters, 
> aviators, and hikers will be forced to upgrade to the new standard.

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