[aprssig] Dayton meltdown.

Wes Johnston aprs at kd4rdb.com
Mon May 23 10:21:14 EDT 2005

No..... it's like a passive repeater.  You take an active (ie preamp'ed)
antenna on the roof and plug a passive antenna into it.  Bias the whole
thing with 5v to run the preamp on the external antenna.  The passive
antenna becomes a radiating antenna.  All the GPS signals become
"mirrored" inside the building.  The only problem I can see is getting
the coax thru the roof.  Think of it is cutting a hole in the roof so
that your portable GPS unit inside the building could see the sky.

I liked the vicinity tracking, but as far as I know, it's only use was
at dayton back in 1998 using those mfj data radios that were mod'ded to
be really really deaf.


Robert Bruninga wrote:

>>Also, has anyone in dayton ever considered a 
>>GPS repeater in each hall? 
>But then everyone gets the same position, the
>position of the antenna on the roof.  
>My proposal for indoor tracking at Dayton is in 
>"vicinity tracking" where we put nearly deaf low-power 
>digis in each room.  With no change on the part of
>the trackers, once indoors, they start getting reported
>via the room digis and since we have full path
>tracing, then the individual is located in the room
>of the first digi that heard him.
>This was my plan back in 1998 or so.  Its all 
>written up in my vicinity.txt file.  These digis are
>called BOX-N digis and whever APRSdos sees
>a packet that comes in via a "box-N digi" it
>ignores the actual posit and plots it as a vicinity
>plot in the vicniity (100 feet) of the box-N digi.
>de WB4APR, Bob
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