Hi
They are fairly standard navigation receivers. The data they put out is also
fairly standard. Based on my experience with flood damaged electronics, your
estimate for working units may be a bit high if they were under long enough to
get well soaked.
Bob
On Aug 4, 2010, at 1:04 AM, jim
I've ordered the mouser project and skipped the parts that won't ship
until 2011. So we're in the same boat.
Leigh/Wa5ZNU
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Dear time nuts,
Background:
I have built a GPS receiver based around the SE4120L front end IC [1].
I used a KT3225 TCXO [2] at 16.3676MHz driving the front end through
a 10nF series capacitor as in the example circuit in [1]. Inside the
front end, this oscillator is multiplied up to form a
fi they are like 265's you can run them in Fleet mode and that can get
you positional updates something
like once a second.
a goal of mine with the 265W I have in the truck once I come across a
cheap Linux PC in a can that
runs off 12V
-pete
On Tue, Aug 3, 2010 at 10:04 PM, jim stephens
Henry Hallam wrote:
Dear time nuts,
Background:
I have built a GPS receiver based around the SE4120L front end IC [1].
I used a KT3225 TCXO [2] at 16.3676MHz driving the front end through
a 10nF series capacitor as in the example circuit in [1]. Inside the
front end, this oscillator is
Hi
I suspect you will find that the phase noise floor of the distribution
system does indeed matter.
Likely the easy way to go:
Square the TCXO up with a biased CMOS inverter (at least as fast as a
74AC04). Run a seperate inverter to drive each of the receivers. A hex
inverter chip would
On Wed, Aug 4, 2010 at 1:50 PM, Bruce Griffiths
bruce.griffi...@xtra.co.nz wrote:
The TCXO output waveform is presumably a clipped sinewave as required by the
SE4120L?
I posted the waveform at
http://www.pericynthion.org/stuff/KT3225_500mV_per_div.jpg
Does that count as clipped sine? If not,
If there are multiple Mouser projects... which one is best (least
backordered parts) and highest quality parts? Please send a link. Thank
you in advance.
Has anyone started updating the project to include substitutes?
73 Brice KA8MAV
- Original Message -
From: Leigh L. Klotz, Jr.
The GPS receiver chip actually specifies that a clipped sinewave should
be used.
Presumably this is necessary to limit the harmonic contents.
In which case low pass filtering the CMOS outputs may be necessary.
The 74AHC04 or equivalent may be a better choice as its ground and Vcc
bounce is
Henry Hallam wrote:
On Wed, Aug 4, 2010 at 1:50 PM, Bruce Griffiths
bruce.griffi...@xtra.co.nz wrote:
The TCXO output waveform is presumably a clipped sinewave as required by the
SE4120L?
I posted the waveform at
http://www.pericynthion.org/stuff/KT3225_500mV_per_div.jpg
Does that
Hi
The phase noise floor of the HC is *much* higher than the floor of the AC
gates. The main reason it specifies clipped sine is that's what the cheap
TCXO's put out.
Bob
On Aug 4, 2010, at 6:42 PM, Bruce Griffiths wrote:
The GPS receiver chip actually specifies that a clipped sinewave
Is that also true for AHC devices which otherwise have similar
characteristics (apart from ground bounce) to AC devices?
Bruce
Bob Camp wrote:
Hi
The phase noise floor of the HC is *much* higher than the floor of the AC
gates. The main reason it specifies clipped sine is that's what the
Bruce Griffiths wrote:
In which case a linear distribution amplifier is probably required.
With only a ~3V supply available, options for the distribution
amplifier topology are somewhat limited.
In principle you could use an emitter follower driving 4 other emitter
followers with a resistor
Hi
It's a speed thing. The faster silicon based CMOS is , the quieter it seems to
be.
Bob
On Aug 4, 2010, at 8:21 PM, Bruce Griffiths wrote:
Is that also true for AHC devices which otherwise have similar
characteristics (apart from ground bounce) to AC devices?
Bruce
Bob Camp
I think I'm a time-nut; as symptoms I include (1) a lot of Mini-Circuits parts
on my bench, (2) searches on eBay for Mini-Circuits goodies, and (3) the desire
to know how my LPRO, 10811, and Thunderbolt are different, and how much better
a Thunderbolt would be with a 10811 double-oven in it...
The spec sheet lists them as being good to 10MHz; would they be ok at
16MHz with a little more loss, or should I worry about resonances with
parasitic capacitance?
73 de Henry M0HMH in Santa Cruz
On Wed, Aug 4, 2010 at 9:14 PM, k6...@comcast.net wrote:
I think I'm a time-nut; as symptoms I
For this application you'll need a bandwidth of somewhat more than 10MHz
to preserve the clock slew rate.
Those transformers are better suited to sinewave operation at 5 or 10MHz.
If one uses a pair of transformers (one for the feedback and one to
isolate the output) then wider bandwidth 1:1
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