Maybe I have a problem unit but I measured the supply to the antenna at 3.7
volts. I have a 5 volt antenna and it still receives sats at the lower
voltage. Anyone else check this supply? I wonder if it is a settable
parameter?
Regards,
Tom
----- Original Message -----
From: <ziggy9+time-n...@pumpkinbrook.com>
To: "Discussion of precise time and frequency measurement"
<time-nuts@febo.com>
Sent: Thursday, May 18, 2017 6:39 PM
Subject: Re: [time-nuts] TruePosition GPS Receiver firmware
Cool. Should be interesting to see what you find. I've been hacking at the
VxWorks side of things, off an on,
but have been distracted by this #wannacry business among other things.
That TL866 is certainly a good value,
and it seems to work well.
Looking forward to hearing what you turn up. I'll keep poking at VxWorks
in the mean time.
On 05/17/2017 08:46 PM, Mark Sims wrote:
I got in a TL866A programmer with the complete adapter set, pulled the
flash chip from my dead TruePosition, and dumped the chip. Success
first time! Now to go through the ROM dump and see what hidden goodies
there are.
A quick look seems to show commands for setting Kalman filter parameters
and antenna (?) attenuation. Also a GAIN command (maybe EFC gain or
antenna gain). There seems to lots of debug modes in it.
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