[Elecraft] K2 qrp battery drain estimation

[Dale Putnam]

Hi Robert,
  The percentages that you use would be accurate for a casual contester, one that would do slow scan S&P...
If, on the other hand, you are trying to beat the record, and are intent on making the 10 ten box, the percentages 
would be more accurate at 80% tx and 20 % rx.  and remember that a battery drops voltage when it get close to discharge. 
 Will look for you /p during the next 'test, or FD.

Have a great day, 
 
 
--...   ...--
Dale - WC7S in Wy
 
 

 
> Date: Fri, 14 Jun 2013 22:28:10 +0000
> From: rcrgs at verizon.net
> To: elecraft at mailman.qth.net
> Subject: [Elecraft] K2 qrp battery drain estimation
> 
> If I'm operating a K2 at 5w cw, in S&P contest mode, I compute the 
> current drain under the stated conditions as follows:
> 
> conditions:
> 50% listening, 50% transmitting
> CW 50% duty cycle
> 
> current:
> 200ma receive, more or less
> 1.0a transmit, more or less
> 
> current draw per hour:
> 100ma [30min rcv] + 250ma [30min xmit @ 50% duty cycle] = 350ma per hour
> 
> 10Hr requires a 3.5Ahr battery
> 20Hr requires a 7.5Ahr battery
> etc...
> 
> Is this more or less accurate, or have I missed something? Thanks.
> 
> ...robert
> -- 
> Robert G Strickland, PhD ABPH - KE2WY
> rcrgs at verizon.net.usa
> Syracuse, New York, USA
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