[Elecraft] K3 Voltage on TX

[ac5p at sbcglobal.net]

If voltage is being checked via the K3 display, I believe there is a series diode before the internal metering that adds a 0.6V drop in TX?   
73, Mike  AC5P 


     On Monday, October 26, 2015 5:08 PM, Bill Frantz <frantz at pwpconsult.com> wrote:
   

 Perhaps it's vanity, but I like running my rig off solar power 
and batteries. Since I also take the rig out in the field 
somewhat frequently, battery power avoids noisy generators. 
(Besides, I own the panels and batteries, but don't own a generator.)

In any case, floating batteries requires a power source during 
operations which doesn't work really well with solar power at 
night. The WVARA operation discovered during the last California 
QSO Party that tired batteries and K3s are a recipe for 
transmitter distortion and local interference in a multi-radio 
operation. The N8XJK Battery Booster is an attempt to get more 
life from tired batteries into the just before dawn hours.

73 Bill AE6JV

On 10/26/15 at 2:18 PM, rmcgraw at blomand.net (Bob McGraw - K4TAX) wrote:

>Well my take.....ANYTHING between the power source and radio 
>has resistance, regardless of how small.  Resistance with any 
>amount of current equals voltage drop.  Thus E = IR  Where E 
>is the voltage drop, I is the current and R is the resistance.
>
>I'm not sure what some of those thing are nor why they are 
>needed but I do know least is best.  As to operating from 
>batteries, floating AGM batteries at 13.8 should not produce 
>any voltage drop other than the resistance of the power 
>cable.    Of course a fuse or switch in line does have R so 
>there goes the regulation as current changes.  Nothing is 
>better than a good regulated supply and hopefully one with 
>remote voltage sensing.  Of course those are more expensive 
>and more of a challenge to install and then have operate 
>correctly in the presence of a RF field.
>
>73
>Bob, K4TAX
>K3S s.n. 10163
>
>On 10/26/2015 3:55 PM, Bill Frantz wrote:
>>I gave up running my K3 through a RigRunner for just that 
>>reason. I put in a short lead directly to the battery bank APP 
>>junction strip and things got a lot better. They got even 
>>better with a N8XJK Boost Regulator between the K3 and the 
>>junction. (Tested with 100W into a dummy load.)
>>
>>73 Bill AE6JV
-----------------------------------------------------------------------
Bill Frantz        |The nice thing about standards| Periwinkle
(408)356-8506      |is there are so many to choose| 16345 
Englewood Ave
www.pwpconsult.com |from.  - Andrew Tanenbaum    | Los Gatos, 
CA 95032

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