Internal battery life (clarification)

[Bill Nault]

Sorry for any confusion, but thanks for the replys (still very helpful
knowing the battery will last several years). What I was mainly
concerned with was how long the battery will operate in between
chargings. Once I get the radio in the spring, I plan on bringing it
with camping, where the only charging source I will have will be off the
car's charging system. So I am curious how long the battery generally
lasts before going dead.

Thanks again
Bill, kc0ejr
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[Bruce Rattray]

Hi Bill - would solar charging be an option for you purpose? - 72 Bruce.

72/73 - Bruce ve5rc/ve5qrp - QRP-C#1, QRP-L#886, A1 Operator
            Enter QRP-Canada's "RUN with RAC" contest -            
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-----Original Message-----
From: [hidden email]
[mailto:[hidden email]] On Behalf Of Bill Nault
Sent: Wednesday, November 16, 2005 4:19 PM
To: [hidden email]
Subject: [Elecraft] Internal battery life (clarification)


Sorry for any confusion, but thanks for the replys (still very helpful
knowing the battery will last several years). What I was mainly
concerned with was how long the battery will operate in between
chargings. Once I get the radio in the spring, I plan on bringing it
with camping, where the only charging source I will have will be off the
car's charging system. So I am curious how long the battery generally
lasts before going dead.

Thanks again
Bill, kc0ejr

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[Ingo Meyer DK3RED]

Hello Bill,

> ... So I am curious how long the battery generally
> lasts before going dead.

The time is dependent from your operating style, the installed option, the
output power and from the style you wound the transformer for the internal
K2 PA. I have not count the hours between charging periods. But its longer
than I want to operate without a break. ;o)

The following is based of equal periods for transmitting and receiving,
because i.e. I send my QTH info and receive the same info from the other
station.

1 hour QSOs = 30 minutes RX + 30 minutes TX

If you use CW you don't transmit the whole 30 minutes, because there are
spaces between the dits and dahs. The real ratio is about 1:1 while TX.

So the new formula is

1 hour QSOs = 45 minutes RX + 15 minutes TX

Now back to the K2. My K2 need 0.28 A while RX and 1.84 A while TX. The
current is dependet from the installed options and more in your K2. Measure
it with the internal meter!

45 minutes RX = 0.75 hours x 0.28 A = 0,21 A
15 minutes TX = 0.25 hours x 1.84 A = 0,46 A
--------------------------------------------
                    1 hour QSO       = 0.67 A

The internal battery contained 2.2 Ah so you can operate 2.2 Ah / 0.67 A =
3.28 h (= 3 hours 17 minutes).

These period is valid only for hardcore QSOers. If you receive longer than
you transmit, so the result will be greater.
--
72/73 de Ingo, DK3RED   Don't forget: the fun is the power!

    [hidden email]   www.dk3red.homepage.t-online.de
      DL-QRP-AG   #824   www.dl-qrp-ag.de
       QRP ARCI #11295   www.qrparci.org
         DARC #2360404   www.darc.de

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