Hi:
Awhile ago there was some discussion about the ICS525 and I finally got
a quote on their demo board it was $57 and 10 weeks. Well it's been
less than 10 weeks and I've made my own, with more features than the
stock version. There's been some delay getting all the stuff to do fine
pitch S
Hi...
Personally, i take great care about the 1PPS timemark
output from my GPS receivers. First thing of all: My
timemark line drives a single 74ACT04 or 40H69
inverter with short leads to get sure the line is as
little loaded as possible without ringing. What
happens after is far less stressing:
Hal,
Certainly true. The UT+ is programmable so that you can disable the 1PPS
altogether, disable it if TRAIM fails, or disable it if the receiver is
not tracking at least one satellite. The default condition is for the
1PPS to be on all the time. Many systems require that the 1PPS stay on
when s
> I'd like to put an LED near the Oncore module that blinks on the 1pps.
> What's the best way to wire this up?
Some GPS boxes turn off the PPS signal when they don't have enough good
satellites.
For those, a PIC works well as a LED driver: on solid when PPS is flapping,
blinking when PPS i
Glenn,
You can drive the LED from the DCD line, but along with a series
resistor you need to be sure to include an extra steering diode in
series with the LED. LED's have absolutely no sense of humor about being
reverse biased above a volt or two. This might also affect your 1PPS
pulse accuracy. I
Could I just drive the LED off the DCD line?
thanks,
glenn
Randy Warner wrote:
>Glenn,
>
>You "should" be alright. You're driving a lot of CAT5, but since the
>data is only at 9600 baud you should be OK. The 1PPS on the DCD line
>will be fine too. To blink an LED you just need to buffer the 1P
In message <[EMAIL PROTECTED]>, Glenn writes:
>
> I am hoping someone can help me with some basic electronic questions
>about hooking up the Oncore UT+.
>
>I have a MAX233CPP two channel rs232 driver. I presume I can use the
>second channel to drive the 1pps on DCD line.
Be aware that such drive
Glenn,
You "should" be alright. You're driving a lot of CAT5, but since the
data is only at 9600 baud you should be OK. The 1PPS on the DCD line
will be fine too. To blink an LED you just need to buffer the 1PPS
signal coming out of the UT+ as it does not have enough drive capacity.
Just about any
I am hoping someone can help me with some basic electronic questions
about hooking up the Oncore UT+.
I have a MAX233CPP two channel rs232 driver. I presume I can use the
second channel to drive the 1pps on DCD line. Yes? I'll have a run of
about 30-50' of CAT5, which *should* work. I should
John:
WAAS Satellite #38 was launched last September to be operational this Fall.
It is at Longitude 107.3W (in the Pacific and along with #48 which was
launched in October are to make up for the loss of #35 for the North East.
My location is in Connecticut.
My GPS unit, a Garmin 17HVS, scans a
TAPR is pleased to announce that the TADD-3 PPS distribution amplifier
kit is now available.
The TADD-3's primary use is to distribute 1 pulse-per-second signals
such as those obtained from GPS timing receivers, but it can work with
pulse signals up to at least 10MHz.
The TADD-3 provides six l
Don Mimlitch,
Your email is most interesting. My GPS76 receiver shows PRN#35, which was
moved West from its position over the Atlantic, but no PRN#38 or #51. What
are the positions of these two WAAS satellites. How are you monitoring if
your 17HVS refuses acquisition?
The reason I am intere
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