[time-nuts] Z3801A with other GPS receiver

Here are a few questions about reusing a Z3801A main board. Would the Z3801A work with another GPS receiver? In other words, does the board talk to the GPS engine via the serial port, other than receiving the 1 PPS? If it does talk to the GPS receiver, which GPS receiver other than the

Re: [time-nuts] Z3801A with other GPS receiver

Sometime in the past few years someone posted a sample trace of RS232 commands (the Motorola binary @@ set) that the Z3801A CPU sends to/from the GPS receiver. It seems to me that if you wrote a emulator/translator you'd be able to substitute just about any GPS receiver for the original Oncore

Re: [time-nuts] Z3801A with other GPS receiver

Hello, If it uses the Motorola propietary commands, a M12 should be quite compatible. I think a have somewhere some older documentation about the @@ commands used in the 8-channel GPSs, but I think that they are quite the same for all Motorola GPSs. Regards, Javier, EA1CRB Tom Van Baak

Re: [time-nuts] Z3801A with other GPS receiver

I thought you had to use a VP in 6 channel mode for it to work on the Z3801A? Jason If it uses the Motorola propietary commands, a M12 should be quite compatible. I think a have somewhere some older documentation about the @@ commands used in the 8-channel GPSs, but I think that they are

Re: [time-nuts] Z3801A with other GPS receiver

Jason Rabel wrote: I thought you had to use a VP in 6 channel mode for it to work on the Z3801A? Jason If it uses the Motorola propietary commands, a M12 should be quite compatible. I think a have somewhere some older documentation about the @@ commands used in the 8-channel GPSs,

Re: [time-nuts] Z3801A with other GPS receiver

Hi Didier: I seem to remember that one or more of the HP boxes that used the 6/8 channel Motorola GPS receivers used a secret method of making use of the sawtooth error information. Some trick was needed because there was a bug that caused the sawtooth to be wrong every now and then and it

Re: [time-nuts] Z3801A with other GPS receiver

For the price people are paying on eBay, it seems almost easier to sell a Z3801 and but a Fury... lol. But then that would defeat the whole challenge of a DIY project. ;) Back on topic - From what I remember reading, I thought the sawtooth bug was in earlier firmware versions. What about the

Re: [time-nuts] Trimble's Mini-T

michael taylor wrote: I was wondering if anyone knows any details, or has evaluated the Trimble Mini-T, a cost effective GPSDO in a small board form factor. http://www.trimble.com/minit.shtml http://trl.trimble.com/dscgi/ds.py/Get/File-361589/022542-007_Mini-T_DS_0207_lr.pdf The datasheet

Re: [time-nuts] Z3801A with other GPS receiver

Didier Juges wrote: That would be fine if I were dealing with a Z3801, but at the moment, I am looking at that Z3801 main board someone has been trying to sell on eBay for the best part of a year and I was wondering if something could be done with it. It has no GPS and no OCXO. I have a

[time-nuts] new paper on Allan Variance errors

The latest IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control (May 2007) has a very important paper by Dawkins, McFerran, and Luiten Considerations on the Measurement of the Stability of Oscillators with Frequency Counters Many of us use or have used a high resolution

Re: [time-nuts] Z3801A with other GPS receiver

Didier Didier Juges wrote: Bruce, Not knowing exactly what that entails, in spite of the volume of useful information you and others have dispensed on this list on that subject, but always the hopeful engineer that I am :-), I wholeheartedly agree with you. Another approach I am