I have a TM4 manual, but don't have a TM4. Heather now has some hooks in it
for the TM4. I'd need a TM4 (at least for a couple of weeks) to properly
implement the TM4 support (one is on Ebay for $4000+ ... no thanks).
Or if somebody with a TM4 can capture around 5 minutes of data from the
That looks like a re-packaged Spectrum TM-4M: https://i.imgur.com/VKZtQzr.jpg
With the internal lead battery and routing to different front
connectors removed, it looks quite alike.
If so, they can do either their custum binary protocoll or NMEA. I
have been meaning to suggest for Mark Sims that
I recently picked up some old cell base station units, and retrieved two
of what appear to be this unit, from Spectrum Instruments:
http://www.spectruminstruments.net/products/custom2/custom2.html
I have asked them if any info is available, but no response yet. If
anyone knows anything about
Hi
Isolation in a carefully managed test setup can be done (with enough money to
spend). Isolation it the real
world with grounds and cables running here and there is likely to be a
challenge. At least that’s been the case
on the few dozen of these systems I’ve designed and put into production
Getting great isolation at 10 MHz is the easy part, given enough
switching elements and control. One question is whether the switchover
needs to be transparent (glitchless), without adding or losing any clock
cycles, and ideally with no phase shift. This would involve a much more
sophisticated
Good News.
I finally decided to leave it running for a few days, after a bit of inspection
(changed some caps here and there, removing '77 vingage NiCs batteries, etc).
Everything is fine, no alarms, readings are ok.
But, still no Ion Current. At least at the meters, both internal and
