Mark,
I haven't had the time to look at the LH code yet, but is there a sort of
natural interface that would most easily fit? I'm speaking about both sides of
the conversation: receiving data streams and sending commands. It seems a bit
strange to me that NMEA would be the preferred type of data stream. And it
should be obvious that giving direct access to the receiver would cause many
problems.
As far as emulating a Motorola: the Ublox is quite a bit different from the
Motorola. Synergy have spent quite a lot of time and money to produce their
SSR-T boards that allow a Ublox receiver to look exactly like a Motorola. I
certainly wouldn't want to replicate that effort.
Bob
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GFS GPSDO list:
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From: Mark Sims <[email protected]>
To: "[email protected]" <[email protected]>
Sent: Saturday, December 17, 2016 7:28 PM
Subject: [time-nuts] Lady Heather for homebrew GPSDO
If you are going to a GPSDO interface, I would bite the bullet and recommend
the Trimble TSIP / Thunderbolt commands. It has its warts, but has commands
for doing just about anything a GPSDO should do. Doing a decent job would not
be easy... Nobody seems to have done a decent job emulating a Motorola
receiver, and that is an easier thing to do.
The lazy bastard way would be cramming so proprietary NMEA sentences into a
NMEA-like stream.
Polled interfaces like the Z3801A are horrible things for a computer to talk
to. If you miss a response or one gets garbled it can be difficult to recover
from. The Z801A is the worst possible interface... it's responses to requests
have nothing in them to identify what request the values are in response to.
Heather really likes to see a device that sends regular time packets every
second without having to request them. Sending device status / TIC readings,
temperature, etc is also a good thing.
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