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[wxsig] Keying Kenwood HT and Current Consumption questions

John Koster w9ddd at tapr.org
Sun Apr 30 16:46:28 UTC 2006

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. 

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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