[wxsig] Keying Kenwood HT and Current Consumption questions

[John Koster]

Another thing you might consider.  There are switching regulators which 
are intended to replace the 7805.  They are not cheap, but perhaps would 
be worth it for this application.  Unfortunately I don't recall any part 
numbers or even a manufacturer.  I remember it was discussed back during 
the TAC2 design.  Perhaps you could contact Tom Clark for the information.  
I'll bet a google of Tom Clark and TAC2 would turn up something. 

-- 
73,
John, W9DDD

On Sun, 30 Apr 2006, Mark Patton wrote:

> Hi Will,
> 
> Below is the link to the manual to the HT that I'm thinking of using.  I 
> have an old ICOM dual-band HT that I'll be using for the "proto" - then 
> will move to the Kenwood once I get everything up and running properly.  
> Thanks to the pointer on the power switch for the radio - I'll need 
> that.  I also found out that not all radios power up in the same 
> configuration that the power down in.  ie - I have a Yaseu VX-5 that 
> comes up with the power turned off if the battery is removed and replaced.
> 
> http://kenweb1.kenwoodusa.com/KenwoodPortal/KenwoodComm/Resources/AMA_InstructionManuals/TH-K2AE%20English%20PDF.pdf 
> 
> Page 104 has the wiring diagram.
> 
> To save power, I was thinking about installing a switch to turn off the 
> display light and/or to simply remove the display.  Wouldn't I need to 
> have the display attached to configure the date, sensors and call sign - 
> then remove the display?  I hate to do this with the power on so I was 
> thinking of rigging in a power switch for the display.   I was also 
> thinking of removing the Max232 since I don't need to be talking to a 
> computer.  The data sheet says it consumes 5ma that I could save. Any 
> thoughts on these ideas?
> 
> I will be running it from a 12V battery that may get up to 15V when 
> charging.  I will need to check the power dissipation of the regulator 
> in an enclosed box but if I remove the display and get the power down to 
> 45-50ma, I doubt that this will be much a problem.
> 
> Mark
> 
> 
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