Jean-Francois,
You certainly could do that - it should not alter any other function that I
am aware of. The current display can be trimmed by changing Control Board
R7.
R10 and R7 are 1% resistors, and that provides repeaability from one K2 to
another - one could hand-pick from 5% resistors
Thanks, I will try and let you know my result !!!
73
Le 05-07-24 à 07:32, W3FPR - Don Wilhelm a écrit :
Jean-Francois,
You certainly could do that - it should not alter any other
function that I
am aware of. The current display can be trimmed by changing
Control Board
R7.
R10 and R7
Folks,
After thinking about this voltmeter 'adjustment' a bit more, I discovered I
had erred. The value of R10 should be INCREASED to make the reading higher.
Sorry - I guess I had a 'senior moment' and got my head turned around wrong.
73,
Don W3FPR
-Original Message-
Jean-Francois,
I'm planning to use a little higher value trimmer, so I would be
able to be more or less in a second. I let you know wich one I use...
I would like the really smaller one (in size) that it can take not
much space as the actual resistor.
Le 05-07-24 à 09:03, W3FPR - Don Wilhelm a écrit :
Don, Do you think after the voltage will be adjust according to an
external DC voltage and an accurate external volt meter, if we change
later the DC source supply, like a battery with a little bit
different voltage, instead of a standard power supply by example, do
you think there will be
Please forgive me for putting on my physics teacher hat and doubly
forgive the algebra which is to come :^))
I'd argue against trying to recalibrate the K2 internal voltmeter to
compensate for the diode drop in series with the supply. How come?
Because changing the resistor values in the voltage
Jim,
You are exactly right - it will read a bit high for all voltages. I don't
believe that would be a problem for most folks since they seldom use the
voltmeter for anything other than monitoring the K2 voltage. If you use the
K2 metering circuit in its EXT mode by changing the jumper and
If you want the K2 voltmeter to read the correct external voltage, why not
connect directly from the input power jack to the external input of the
voltmeter, and slide the switch/strap over to the EXT position? In this way
you bypass the diode loss and there is no need for recalibration. Or are
Steve,
Although some have been confused by the readings at first, I don't see any
advantage in modifying the internal voltmeter to read the external supply
voltage - what it reads is the actual voltage the K2 is operating at - but
if changing it is your choice, by all means do it - it should be a
Hi Don,
You said : By lowering the value of R10 ... Could I just put a
trimmer near that value instead of R10 and tune the trimmer so that
the voltage displayed match more closer the real external voltage ???
And could I do limilar thing with the current display ???
I don't want to be
Hi Don,
You said : By lowering the value of R10 ... Could I just put a
trimmer near that value instead of R10 and tune the trimmer so that
the voltage displayed match more closer the real external voltage ???
And could I do limilar thing with the current display ???
I don't want to be
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