On Fri, 12 Jul 2019 at 22:02, Hal Murray <[email protected]> wrote:
> > [email protected] said: > > If it could run from a few NiMH cells for 48 hours, that would give the > > option of shipping it. I don't know if that's going over the top, but it > > would be an interesting exercise. > > Shipping a TEC cooler could get interesting. You need to get rid of the > heat > somehow. Cooling fins on a package would be interesting. That is why I said that I would avoid a TEC. Running an oven should be less problematic. > > > The airlines don't like dry ice. You could try an ice pack/gel. If it's > well > insulated, the TEC will be off. The heater won't take much power. It's > just > a matter of how much insulation you need. I would not aim to ship by air, although at a push that might be possible. In the UK, in theory items can be shipped with batteries by Royal Mail subject to some restrictions. Batteries inside equipment are okay up to some capacity. Damaged cells or lose cells are not. In practice a lot of staff in post office shops say no to batteries. I regularly get alkaline and NiMH batteries delivered from Farnel by UPS. The packages are not marked. In contrast, even a coil cell comes in a box saying it is batteries, not in transport if the package is damaged etc. So Farnell follow all the rules. I contacted DHL once about a UK shipment of a battery powered item. That was not a problem. If the box was much bigger than an OCXO, resistor oven, I don’t believe heat would be a problem. > > > What's the hysteresis on a resistor? Is it really important to ship it > powered up? That I don’t know, but sometimes one does things as a challenge out of interest, and to learn. It would be interesting to know if a resistor was worth shipping powered up. Dave. -- Dr. David Kirkby, _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
