several people on the list have this device, I'm curious how you
interface with it. What commands switch to NMEA or UBX Binary? I tried to
use ublox U-Center v8.1 without success (although that program works fine
in generic NMEA mode on a different model GPS). Thanks for any advice!
-John Beale n8juf
Thank you Bob! I just tried removing the lock indicator LED on my three
5680A units and sure enough, in every case, there was the 1 PPS (+5V, 1
usec, rise/fall time ~100 ns) just as if it had always been there.
As a reminder, this and much else useful lore is now collected at the
ongoing
http://www.rhodiatoce.com/pics/time-nuts/FE-5680A_annotated.jpg
Excellent work! I look forward to any further info.
Great picture with the pins and some parts labelled. By the way, if you
want you could add the frequencies going into and out of the Xilinx
XC9572XL CPLD part:
Pin 64: 60
On 1/29/2012 8:22 PM, Skip Withrow wrote:
I recall someone implementing C-field control on a FE-5680A with the pot
disabled, but cannot find it now. If someone can point me to that post I
sure would appreciate it.
I added that post to the FE-5680A FAQ, and added my own photo also to help
byte reply: 59 56 00 0F 68 FF FF 01 00 E3 FF CE FF D8 FF EA
FF D2 FF F0 FF FE FF 16 00 0A 00 0D 00 F6 FF 00 00 EF FF FE FF DD FF D3 FF
E2 FF F5 FF F2 FF F3 FF E5 FF EE FF B3 FF C4 FF DA FF A9 FF 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 4B
---
John Beale
n8juf
/5681715799377076466?banner=pwa
-John Beale
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/109928236040342205185/FE5680A?authkey=djqVhWs9LkM#5680683008490223330
Of course there may be some completely different problem with your unit,
but it's something to try, if you want to open it up and play with it.
-John Beale
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Previously I have been comparing 10 MHz frequencies using TvB's picPET
device plus a picDIV divider to get a 1 PPS signal, but I wanted more
resolution for comparing relative drift of two Rb references. I got square
wave outputs from my references (see my previous posts) and I made a simple
On Thu, 29 Dec 2011 21:14:30 -0800, John Beale be...@bealecorner.com
wrote:
In case it's useful... there are many ways to get a square wave out from
a sine wave in, but one straightforward way is with a comparator. [...]
FWIW, I decided on a more straightforward way to get a square wave
temperature sensitivity (measured at case temp 42 and 52 C). Has anyone
else measured theirs?
-john beale
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My measurements on one FE-5680A Rb sample indicate a temperature
coefficient of -7E-12 per degree C (T measured at exterior case top
center); more details below. Can anyone opine if this is a reasonable value?
I can't say anything about long-term drift until I stabilize the case
temperature.
might be trimmer caps on the board, and
what might be a round heating element(?) soldered to a crystal can in this
photo:
https://picasaweb.google.com/lh/photo/0WRM10pGG0Kd89Ji80yoa9MTjNZETYmyPJy0liipFm0?feat=directlink
thanks for any advice!
John Beale
N8JUF
use this device in the west :-)
3) Don't try to use *bay GPS Antenna Item: 260664041419 including 10-meter
lead to MCX connector, it doesn't work. Not even on a different, known-good
receiver. Might have too high a gain (55 dB??) Or I just got a bad one.
-John
On 4/9/2011 8:00 AM, John
On 3/4/2011 11:54 PM, John Beale wrote:
The TX line out of the board just sits
quietly at +3V. Is there anything obvious I should be trying?
Er.. nevermind. It seems that swapping TX and RX helped. Sigh.
---
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SFTW P/N # 61-G10002A
SOFTWARE VER # 1
SOFTWARE
In case anyone else is shopping online for a used Motorola Oncore M12+T
timing GPS, it's probably useful to know what I just learned:
Some online sellers offering M12+T 100 pps GPS may instead send you a M12
Navigation (non-timing) GPS. The differences:
Motorola Oncore M12 Navigation GPS:
I just received my first real piece of time hardware, a M12+T timing GPS.
At least, that's what it's supposed to be, it doesn't actually have any
label saying so. I got it online from this seller:
http://www.ioffer.com/i/Motorola-ONCORE-M12+T-timing-gps-receiver-1pps-100hz-105387652
The board
to the other. I see a slow
steady increase in phase lag, accumulating 167 ns in 7 minutes, so I have a
frequency difference between my two oscillators of 1.67E-7/420 = 4E-10 or
0.4 ppm. For better measurements I guess I want a PIC-TIC or equivalent.
-John Beale
Hi Murray,
Thanks to you and the others for your replies. After some more HF reception
problems here, I have come to the same conclusion as you. I found an Oncore
M12+ timing GPS is available pretty cheap from Hong Kong, so that's my plan.
best regards,
John Beale
1. My best advice
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