Yesterday I activated G/SB-006 Shillhope Law. Nothing particularly exciting about that, the hill is easily accessed via a quad bike trail, but being a 2 pointer it attracts the 3 winter bonus points. Nice.
So off I went, driving to the access point just as dawn broke on an icy landscape. Because of the forecast low temperature I had taken the precaution of carrying 2 10Ah Lipo packs. The air temperature as I left the car was -9C, I guess it did not warm up as I ascended to 500m asl at the summit.
As is my norm I first tried to activate on 7MHz but was beaten back by the wall of “contesters”, apologies to those who listened for me before I QSY’d to 60m cw.
Yes I remember: Weekends = Warc and 60m bands.
So back to the batteries:
Using the first pack I made about 40 QSO’s at which time the battery voltage had fallen to 10V, perhaps only 60% usable capacity had been available. During this time I kept the second battery pack warm by keeping it in my clothing. When I started using it it’s temperature would have been about 20C. It maintained the voltage better, but soon cooled and the terminal voltage declined. Moral of the story, I am going to make a 1.5m extension power lead so I can snuggle the battery during use and preserve the terminal voltage and capacity (or stay in doors).
Another lesson learnt.
David (Nanook from the North)