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Might not be a silly question. How do I know when the U2 is frequency synchronized to the 1PPS. 73 Peter G8AEN

On 20/05/2013 21:43, Keith Maton wrote: > Since I added battery backup to my GPS module at the weekend things are more consistent. > > When I apply power, the clock shows and it's normally accurate to

Tony, I've got an adafruit GPS unit (http://www.adafruit.com/products/746) which I've connected using four wires to the U2 kit: 1pps, +V, gnd and data. It has the ability to run with a battery

Hi Hans here is the link: http://arduino.cc/en/Main/ArduinoBoardUno it is about 1/4 of the page down. 73 Colin

Hi Colin All of the standard Arduino pins are fed through the shield in the standard way. So if the website recommends that the Arduino can be powered by Gnd and Vin through a shield, this would

Keith, Could you say more about the battery backup you added? What is the exact voltage on your system? How is it different to what you had before? I have not been able to get my EM-406A to operate

Hi Hans and Alan, Thank you both for the information and the links Alan. Have you any advice for me about question 1 of my last post: If I run the ARDUINO UNO on battery power can I connect it to

:-) . I don't know, I hoped you would. PPS < ???25 ns @ 50% was copied from the manufactures data. Its very short, I can't see it on my scope all I can get is a trigger from its leading edge so I

Hi Eddie By 50%, you mean the duty cycle is 50%? If so, this would support my theory that this issue is related to very short pulse widths on some GPS modules. 73 Hans G0UPL

Hi Hans Jolly good. Personally I think it shows what we have found with WSR, the results on each U2 are inconsistent, Andy FTD had prety good linearity and my steps are not linear on 3.5MHz. Some of

Hi Eddie How did you increase the requested steps to 10Hz total? The FSK (Hz) size parameter is ignored here. In the custom message mode, the size of each step is *always* 0.5Hz. So if you have 12

Hi Barry The DDS resolution stated in the AD9850 datasheet is 0.0291Hz with 125MHz reference clock. 73 Hans G0UPL

Hi Colin As Alan said, there's a book see http://hamradioprojects.com/ for the details. People can still build and operate the QRSS Arduino shield without the book. But the book does contain a lot of

Since I added battery backup to my GPS module at the weekend things are more consistent. When I apply power, the clock shows and it's normally accurate to within a few seconds. I put the GPS invert

Well I am still trying to make 8 beans equal 12. No matter how yo look at it there are only 8 distinct levels on 3.5MHz Eddie

Hans has contributed three chapters, including one on QRSS and one on the multimode transmitter shield, to the new ARRL book 'Hamradio for Arduino and Picaxe'. It's well worth a look, it would

I started the 2n7000 wikipedia page! Leigh/WA5ZNU low-power switching applications. The two are nearly identical except that the leads are arranged differently and the current ratings are

Hi Hans and all, I have a couple of questions about the arduino shield. 1: If I run the UNO battery power can I connect it to GND and Vin (as recommend by the arduino website) through your QRSS