[aprssig] Battery & Charger for APRS Station

Steve Noskowicz noskosteve at yahoo.com
Mon Apr 21 20:48:54 EDT 2008

Ignore previous...

damn keyboard.  I'll try this again.

--- Ray Wells <vk2tv at exemail.com.au> wrote:

> Steve,
> I wonder if you misunderstood the function of the solar charge 
> controller? It didn't float the battery at 14.4 or 13.4, they were the 
> switch off and switch on limits for charging. 

   OK. got it.   The best charge voltage is still a function of the battery's
construction and the load characteristics.  This tells me that you are
describing a current charge with voltage sense limits.  That is, indeed, a
different situation.
   I'd still be curious about a comparison between the float and this

> The problem with a 13.8v float charge is that a) the battery is only 
> charged to about 85% capacity 

   This is not my understanding of a float, but I was not in charge (no pun
intended) of battery operations, only listened in and read some about it.  A
couple of small SLAs I have recommended, if I recall, 13.6 - 13.8 float.

> Regarding RF pollution from chargers. I had a homebrew 15A/13.8v supply 
> of standard design - bridge, big cap, 723 regulator driving external 
> pass transistors. This supply produced RFI up to the 6m band and it was 
> coming from the bridge rectifier. A 0.1uF disc ceramic across the 
> rectifier DC tabs fixed it.

Interesting.  I'll drop off this OT thread.  Good luck with your APRS digi
backup batteries.   (;-)

73, Steve, K9DCI

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