I've always liked this one because it demonstrates a real understanding, that there are 1.8 F deg in one C deg. And you can deal with the endpoints from either conversion direction. Chuck, KE9UW aka Jack, BMW Motorcycles
Chuck, KE9UW aka Jack, BMW Motorcycles ________________________________________ From: elecraft-boun...@mailman.qth.net [elecraft-boun...@mailman.qth.net] on behalf of Matt Zilmer [mzil...@verizon.net] Sent: Thursday, April 26, 2012 11:49 PM To: d...@w3fpr.com Cc: Elecraft Reflector Subject: Re: [Elecraft] solder iron correct temp in C for K3 Nice memory aid! matt On Thu, 26 Apr 2012 23:59:05 -0400, you wrote: >Actually, the conversion is easier to remember than those two formulas. >The two scales coincide at -40 degrees. >So for the conversion (either way) first add 40. >Then if the conversion is from Centigrade to Fahrenheit multiply by 9/5 >(you will be going to a greater number), but if the conversion is from >Fahrenheit to Celcius, multiply by 5/9 (because the result will be a >smaller number). Finally, subtract 40 to get your result. > >The skeptical may try several passes with their remembering when to add >or subtract 32 degrees, but this formula always works. > >73, >Don W3FPR > >On 4/26/2012 10:10 PM, Fred Jensen wrote: >> On 4/26/2012 4:26 PM, W9HAK wrote: >>> I have a new solder iron that is temperature controlled in degrees >>> C. What temp should I set the iron for work on the K3? I am using >>> 60/40 rosin core, small diameter solder. While using solder wick to >>> clean out the holes from the 12 dc mod kit I used 300c and dipped the >>> wick in solder flux. I pulled the solder wick across the land when >>> the solder was liquid, it cleaned the holes on the first pass. >> F = 32 + (9 * C) / 5 >> C = [(F-32) * 5] / 9 >> >> 73, >> >> Fred K6DGW >> - Northern California Contest Club >> - CU in the 2012 Cal QSO Party 6-7 Oct 2012 >> - www.cqp.org ______________________________________________________________ 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
