They use the LEA-6T for DIY drone applications because it provides raw
carrier phase information. The raw carrier info is compared with the raw
carrier data from a nearby fixed (and surveyed for an extended period) GPS
receiver. The position error of the fixed station is subtracted from the
I you are really really dead set on building your own there are lots of
chips available with varying levels of external parts needed.
An economical and versatile solution is to use one of the digi TS-One or
portserver TS terminal servers. They are a little pricey new, but, last time
I needed
Hi,
How does patent infringement litigation get started anyway?
I would think that the infringement claim would have to be specific i.e.
you are infringing on our patent number blah, claims blah, blah, blah
blah. not just you are infringing on our patent. you need to halt
production
It's unclear whether you already have an aceIII installed and believe it needs
to be replaced, or, your 2100 does not yet have a GPS receiver and you want to
do the conversion.
A good link describing one variation of the 'always busy gps' problem is
A unidirectional error of 1/100th of a second would accumulate around a
minute and a half per day. It's been a long time since I laid eyes on a
mechanical pendulum clock. I remember the clock in my childhood home kept
better time than that. ( I became odd very early. I compulsively compared
An interesting technique for improving the accuracy of single band gps is
embodied in an open source program/project called rtklib.
Essentially it uses one GPS receiver in a fixed location that has been very
carefully surveyed (gps reported location averaged over a long period) as a
phase
You might want to try using a 'power passing splitter' as marketed to
satellite TV and Cable TV.
there are lots of them on ebay in the neighborhood of $5.
As I recall there was a gps splitter project on the web that used a cable
splitter and 'bullet' amplifier.
If you can live with 4dB loss,
Even with graphics it works fine (I think it works better) headless using X or
VNC
Sent from my iPhone
On May 25, 2013, at 17:05, mike cook mc235...@gmail.com wrote:
Le 25 mai 2013 à 22:53, Jim Lux a écrit :
On 5/25/13 10:55 AM, Chris Albertson wrote:
3) the Pi is almost PC-like
10 MHz over unshielded twisted pair works very well. That's what Ethernet
10BaseT is after all. Either scrounge some pulse com transformers out of
ancient Ethernet cards or use a pair of 'video baluns' which are sold into the
closed circuit television industry for transporting video over cat5
If I'm not mistaken, the oscillator frequency needs to be an integer multiple
of 240 KHz.
Dale
Sent from my iPhone
On Mar 29, 2013, at 8:37, Bob Camp li...@rtty.us wrote:
Hi
There are a variety of VCXO's and TCVCXO's on the Mouser site. Prices seem to
range from $3 to $10 for the
That header is used for programming the on board PIC. I've rung it out as
follows:
Header pin 1 - PIC pin 18 MCLR (active low)
Header pin 2 - PIC pins 28 40 VDD
Header pin 3 - PIC pins 29 39 VSS
Header pin 4 - PIC pin 21 PGD1
Header pin 5 - PIC pin 22 PGC1
73
Dale NV8U
Sent from my iPhone
On
PIC is a PIC24FJ64GA-004-I/PT
Sent from my iPhone
On Dec 21, 2012, at 2:20 PM, KD0GLS kd0...@mninter.net wrote:
I'm looking at Synergy's Tech Note #493 for the SSR-6Tr and trying to make
out the part number of the PIC from the picture. Looks like it might be a
PIC24F part. Would
Though the $35 special is only good for 1 unit per person,
Synergy offers a 10% educational/ham radio/experimenter discount for
additional/subsequent units
bringing the price to around $63 for time-nuts who need more than 1. I'm
thinking the other unit they have announced (without the PIC)
Just curious,
what connector/pigtail/adapter board did you use to access the 2x5 1.27mm
pitch connector on your SSR-6T.
Thanks,
Dale NV8U
-Original Message-
From: David Martin
Sent: Thursday, December 20, 2012 1:07 AM
To: time-nuts@febo.com
Subject: [time-nuts] Just for Fun - Synergy
Arduino is Dirt Cheap!
At it's cheapest it is just an atmel AVR, a crystal, 2 caps and a resistor
with the arduino bootloader programmed into it. Easily obtainable from
several sources for 5 bucks or so. All the code, toolchain etc. (the
ecosystem as it were) is free. it's real easy to put one
all
either work with a crystal two caps and a resistor. Most will run fine with
none of the above on the internal clock.
Bob
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Dale J. Robertson
Sent: Thursday, December 06, 2012
tools. You can do it on several
processors, none of which come from AVR (and thus use the Arduino chain).
Bob
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Dale J. Robertson
Sent: Thursday, December 06, 2012 1:47 PM
To: Discussion
Bob,
Which category do the FE-5680A's fall into?
Dale
NV8U
-Original Message-
From: Bob Camp
Sent: Wednesday, November 14, 2012 6:28 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Confused about Rubidium oscillators
Hi
There are several
OK,
According to the Phillips original data sheets quick reference chart the
chip wants to see around 1mV of input signal.
The output will not be a digital data stream with ones and zeros
corresponding to the phase of the input.
Instead, from what I can glean from the datasheet, it will be a
if it worked
Regards
Paul
WB8TSL
On Sun, Oct 21, 2012 at 10:55 PM, Dale J. Robertson d...@nap-us.com wrote:
Paul,
I'm trying to understand your reference to 'differential BPSK' all the
RDS references I've looked at indicate a 180 degree phase shift just like
WWVB. I'm thinking that differential
While looking for other stuff I came across the data sheet for the NXP
Semi SAA6579.
The chip is a purpose built demodulator for RDS (which utilises a 57 KHz
ABPSK subcarrier on FM broadcast that is) used for traffic, song info
etc. This chip has an anti-aliasing front end low pass filter and
, 2012, at 10:03 PM, paul swed paulsw...@gmail.com wrote:
Because it use differential BPSK. I have a number of them and was trying
it. There is a test pin that might make it useful.
Regards
Paul
WB8TSL
On Sun, Oct 21, 2012 at 9:14 PM, Dale J. Robertson d...@nap-us.com wrote:
While looking
if it worked
Regards
Paul
WB8TSL
On Sun, Oct 21, 2012 at 10:55 PM, Dale J. Robertson d...@nap-us.com wrote:
Paul,
I'm trying to understand your reference to 'differential BPSK' all the
RDS references I've looked at indicate a 180 degree phase shift just like
WWVB. I'm thinking
Using the arduino infrastructure can be dirt cheap! The arduino itself is
just an Atmel atMega microcontroller with the arduino bootloader burned into
the bootloader section of the controllers flash. For embedding you can buy a
DIP atmel atmega328 chip already burned for less than $5. There are
The AM characteristics have not changed. That means that there is at least
10% carrier present at all times.
The transmission format seems pretty well documented. The remaining
mysteries are in data formatting.
Regards,
Dale NV8U
-Original Message-
From: Peter Monta
Sent: Thursday,
Which for all intents and purposes means nothing that looks like an antenna
to John Q. Public. What if your GPS antenna looked like a vent pipe? or a
Bird House? It may be difficult to hide a decent HF antenna, But, a 1.5 GHz
antenna can be virtually invisible.
Dale NV8U
-Original
The most likely scenario is that XW has a patent pending on technology which
permits the manufacture of a very cheap dependable time-code receiver for
the mass market. Think along the lines of receiver subsystems below $5
(maybe below $1). If there were a market for WWVB timing receivers you
Jameco
www.jameco.com
seems to have plenty of them.
On 4/13/2012 12:46 AM, Burt I. Weiner wrote:
Hopefully someone out there has a stash of what I'm looking for. I
need 4 ea IC type CA3130E. Need this specific number. It's an 8 pin
DIP. I've tried DigiKey and Mouser. No luck.
Thanks,
It seems to me (and I would be more than happy to hear any differing
opinions) that your GPS antenna only needs to be high enough to be able
to see a reasonable slice of sky. i.e. if your workshop were in the
middle of a circular clearing 80 feet in diameter in a forest with an 80
foot tree
If it's a 44pin plcc I can burn it.
Dale Robertson
NV8U
-Original Message-
From: Joseph Gray jg...@zianet.com
Sent: Sunday, March 18, 2012 3:18am
To: Discussion of precise time and frequency measurement time-nuts@febo.com
Subject: [time-nuts] IOTECH 488 EPROM
The text file accompanying
I own one of these that I bought directly from Seeed Studios. Seeed also
sells some very inexpensive MCX-BNC females for use with these as well
as 1x-10x probes with mcx connectors. I have had their single channel
version (DSO Nano) for a while and have found it handy. The DSO Quad has
a
I Don't know what problem you all are having.
Rob Kimberley's email address (robkimber...@btinternet.com) is present
plain as day in the from header of his post.
subject was :
Re: [time-nuts] FE-.5680A trimming resolution
posted 1/31/2012 4:14PM
Master your email or it will master you!
Dale
this was a mainstream application on a host. So who knows
what shape the OS's are in in regards to real-time performance on serial
line pools.
Having said all that, Assuming you have the serial line hardware
available. It would certainly be an interesting experiment!
Regards,
Dale J. Robertson
On 10/23
files?
I can't even imagine what Agilent might charge to repair the instrument!
Thanks,
Dale J. Robertson
NV8U
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