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[wxsig] Keying Kenwood HT and Current Consumption questions

John Koster w9ddd at tapr.org
Sun Apr 30 08:32:43 UTC 2006


I saw it post.  Do you have your profile setup to not get copies of your 
own emails to the list?  It should default to sending you copies, but 
there is an option to not get them which might explain you not seeing your 
own posting.   

-- 
73,
John, W9DDD

On Sun, 30 Apr 2006, Shane Justice wrote:

> This must have fallen into a bit-well, as I sent this earlier last  
> week, but never saw it show up on the list:
> 
> Also, note that I have the backlight ON (the thing actually generates  
> heat one can feel if one puts their hand above the display- I was  
> surprised at this).
> 
> 
> Hi Mark,
> I just put the 238+ on my AstroFlight Watt Meter and checked it's  
> power consumption. The meter shows 260mA @ 13.6 volts, or  
> approximately 3 Watts. This power consumption is with or without the  
> temp/humidity sensor connected ( I am not powering the fan at the  
> moment ). This is with the display backlight ON. Now, I've never  
> calibrated the "Whatt Meter", so I don't know how accurate it truly  
> is, but at least this is a back of the envelop, ball park number with  
> which you can calculate power requirements.
> 
> If it's going some place cold, remember batteries don't yield power  
> well when too cold, and plus up the size of the battery for that, as  
> well as the number of days you DON'T get sunshine. That also tells  
> you to size your solar array appropriately to charge that battery for  
> continued use over less than perfect days. A battery management  
> system for controlling charging, as well as discharging, is a smart  
> idea, if you want your creation to last a long time in-place, and  
> with minimum visits to replace the big, old, heavy batteries.
> 
> I assume you are thinking of remoting the weather station? I have had  
> similar thoughts- I'd like to put together a combination WX station/ 
> digipeater for use on remote mountain areas here in Arizona. I've  
> been thinking about solar panel-replenished battery power. At a high  
> enough altitude, with a high-gain antenna, one needs very little  
> transmit power to adequately cover a large area.
> 
> 73,
> Shane
> KE7TR
> 
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