[Elecraft] K2 voltage requirement

[Phil Kane]

On 5/12/2009 9:04 AM, Vic K2VCO wrote:

> When operating a QRP K2 in the field with a battery, how low can
> the battery voltage go before there are problems with signal
> quality?

> Will it work down to 10.5v?

  FWIW my experience with a K2/100 operating at 30-40 watts is
  that below 11.5V it goes sour.

  I had to arm-wrestle Trojan Battery to get ampere-hour
  discharge curves down to that level for my 27AGM batteries. The
  industry standard for ampere-hour discharge ratings is down to
  10.5V.  They finally admitted that the discharge capacity down
  to 11.5V is about 70% of the 10.5V rating.

  One of my professional colleagues is a national expert on
  battery supplies for communication sites and he concurs with
  that figure for that type of battery.

--  73 de K2ASP - Phil Kane
    Elecraft K2/100   s/n 5402