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I have exactly the same experience Paul. I am gradually zeroing in on the perfect clock setting and am currently at 19984500 for the entry of the System Clock. This has kept it pretty close to the BBC

My new 2.02a has also changed the clock settings by only changing the processor. I have a small piece of the foam that the processor was stuck into for shipping as an insulator over the 20 MHz

Yes, very nice work indeed Philip. 73, Yan - XV4Y.

Hans, you were right. When I got back home I pulled the insulation cover away from the U2 and found a Murphy's whisker causing problems. All sorted now with the system clock keeping good

Thanks for the explanation Hans. If you say it, it must be true. The reason I sound puzzled is that when I started having trouble with the U2 and my GPS board, and since I don't have a scope, I rigged

I think that would be ideal Hans. If the 1pps is available use it, if not use the NMEA data to auto correct the Frequency Reference. I doubt that is a simple task but it would allow use of a greater

Hi Hans Thanks for the reply. Its certainly strange as I had the kits clock working fine (kept perfect time over 3 days) with version 2.01. All I have done is put 2.02a in. Now that I know its

Andy: When GPS is ON, the U2 relies on the 1pps as it's one second tick. The U1 behaved exactly the same way. If you have a GPS module which stops sending the 1pps signal when it loses satellite

Hi Tony, I've only switched the U2 off gps once to check the 20mhz clock setting anf the results scared me so I switched the gps back in straight away. The seconds were very random, jumping up in

How far out is the nominal 20MHZ clock setting from the actual oscillator frequency Andy? I can't see how the unit could go off time over a few minutes? My understanding is that it resorts to its own

Hi Hans, Just wondering if you could clear something up for me please. I thought timing sync came from the nmea data from the gps. It looks to me that once a pps signal is received, the U2 takes

Andy Yes I have various GPS units that I have yet to try with v2.02a; none of them worked with v2.02, even the UP501, which other people managed to work. My difficulty is lack of time at the moment to

Ok Barry, glad you found the problem. Are you going to use gps in the future? ------------------------------

Hi Andy Your email prompted me to make the obvious check: connections, I use females headers to the male pins on the pcb so I can remove the unit and other bits easily. Of course, one connector,

Hi All I've had my U2 working for a few days now with a Trimble (Silvana/Condor)GPS. The GPS is producing data & 1pps and sets the time and freq adjustment on the U2. However it does not seem to

Hi Barry, I think whats happening is the kit is waiting for the next transmit cycle so you may just have to wait a while after powering up before you see anything on the lcd. Did you have any

Help please. Just received v2.02a, inserted same, entered call-sign, message and other variables etc, and ran for 24 hrs to enable recalibration for time. After adjusting the ozzy for time, pulled the

Of course! Actually, it was one of my uncles cigar boxes... This thread could turn into a Monty Python sketch.... "You were lucky, when I was a lad, five of use had to live in a cigar box and it

That video is brilliant Graham. I just sent it to my engineer son. :)) bzb

http://www.hanssummers.com/crystal.html You were lucky to have a Dad who was skilled in these matters. Nobody in my house had a clue about any of that stuff, and my only words of encouragement were