Usually the limiting factor for low temperature in modern equipment is the LCD. They have a problem crystalizing much below freezing and thus are not usable in very cold temperatures.
I hope thing don’t get too cold in your area - we are forecast to see 19F here in SW LA on Tuesday morning. Yuck! 73, Jack, W6FB > On Jan 13, 2024, at 1:13 PM, William Hammond via Elecraft > <elecraft@mailman.qth.net> wrote: > > Doug, You didn’t specify which “K” radio you were inquiring about. My K4D > manual page 45 says: 0 C to 50 C or 32 F to 122 F. The K3s manual > specifics 0-50 C for frequency stability. The K2 manual does not mention > operating temperatures. The KX3 manual does not specify. I checked the non > “K”, IC-7300 manual and operating range is stated as: -10 C to +60 C or +14 > F to +140 F just for a sanity check. To be safe, keeping the radio above > freezing is a good idea. I would think that condensation or moisture of any > kind is the enemy in the cold. Storing and operating are different things. > > That said, I worked on a military radio that mounted in the 47 section of the > B-52D, F with no environmental controls. It was subjected to 50,000‘ > altitude and -50 C, F . The failure rate of that radio was much greater > than the same radio that was in the pressurized and air-conditioned in a > forward section of the aircraft. I might add that these radios were > electrically tuned to a frequency using DC motors and heterodyned crystals > (the AN/ARC-34) and it was almost always the tuning that failed. These > radios were in tropical conditions in Guam or Thailand when not flying. They > used sub-miniature tubes about a third the size of a miniature tube. > > 73, Bill-AK5X > >> On Jan 13, 2024, at 9:22 AM, Doug Hensley <w...@hotmail.com >> <mailto:w...@hotmail.com>> wrote: >> >> What minimum temperature should a K station be kept at during a hard freeze >> and is there a cold temperature point at which it should not be powered up? >> >> Please reply to the list and as always do not reply to a digest. Thanks in >> advance >> for any information. >> >> 73, Doug W5JV >> >> >> >> >> >> Visit https://www.qrz.com/db/W5JV for some great vacuum tube finds. >> >> >> ______________________________________________________________ >> Elecraft mailing list >> Home: http://mailman.qth.net/mailman/listinfo/elecraft >> Help: http://mailman.qth.net/mmfaq.htm >> Post: mailto:Elecraft@mailman.qth.net >> >> This list hosted by: http://www.qsl.net >> Please help support this email list: http://www.qsl.net/donate.html >> Message delivered to a...@me.com <mailto:a...@me.com> > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net <http://www.qsl.net/> > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to jackbrin...@me.com <mailto:jackbrin...@me.com> ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
