Re: [time-nuts] FE-5680A DDS Board/PIC Code

2013-02-28 Thread Herbert Poetzl
On Thu, Feb 28, 2013 at 03:49:55AM +0100, Magnus Danielson wrote: On 02/18/2013 10:32 PM, Herbert Poetzl wrote: [ lot of stuff zapped ] It would be interesting if fractional resolution of the DDS would be developed using the PHASE interface. As PHASE ripples, a carry needs to be sent into

Re: [time-nuts] FE-5680A DDS Board/PIC Code

2013-02-27 Thread Magnus Danielson
On 02/18/2013 10:32 PM, Herbert Poetzl wrote: I'm new to the time-nuts community, so I simply start with a short info on how I got into this situation :) (skip forward toONTOPIC if not interested) Not long ago, I decided to build a reasonably good frequency counter for my personal use and

[time-nuts] FE-5680A DDS Board/PIC Code

2013-02-18 Thread Herbert Poetzl
I'm new to the time-nuts community, so I simply start with a short info on how I got into this situation :) (skip forward to ONTOPIC if not interested) Not long ago, I decided to build a reasonably good frequency counter for my personal use and maybe if the result is simple and elegant, I'll

Re: [time-nuts] FE-5680A DDS Board/PIC Code

2013-02-18 Thread paul swed
Herbert Thanks for the assembly listing. Someone else on time-nuts had done quite the job of reverse engineering the schematics and other information. Seems like the two of you could collaborate. Sorry do not recall the name. Welcome to time-nuts. Regards Paul WB8TSL On Mon, Feb 18, 2013 at 4:32

Re: [time-nuts] FE-5680A DDS Board/PIC Code

2013-02-18 Thread Bob Camp
Hi There's quite a bit less in the PIC code than I would have expected. If that's everything that's there, the PIC does very little heavy lifting. Nice job on the dis-assembly. Many of the 10 MHz out FE Rb's are actually the 1 pps version that has been converted to 10 MHz after the fact. The

Re: [time-nuts] FE-5680A DDS Board/PIC Code

2013-02-18 Thread GandalfG8
In a message dated 18/02/2013 22:45:12 GMT Standard Time, paulsw...@gmail.com writes: Herbert Thanks for the assembly listing. Someone else on time-nuts had done quite the job of reverse engineering the schematics and other information. Seems like the two of you could collaborate. Sorry do

Re: [time-nuts] FE-5680A DDS Board/PIC Code

2013-02-18 Thread WB6BNQ
Hi Herbert, Nice work ! A few comments that may help you in your quest. There are two primary methodologies used in the FEI-5680A Rubidium. It appears, from your picture, what you have is the older style that is analog for control of the Rubidium frequency control loop. A VERY GOOD THING !

Re: [time-nuts] FE-5680A DDS Board/PIC Code

2013-02-18 Thread EB4APL
Hi, Probably Elio will jump in and tell us more on this, but I must advice that the unit where he did his forensic examination was a FE-5680A of the 10 MHz fixed frequency output variety (not accounting for the small adjustment margin)and also has a fixed 1 PPS. This unit doesn't have the