[Elecraft] KAT500 tuning & K3 power control

[ab2tc]

Hi,

I have not monitored the input current while it's tuning, but I have no
doubt that it's jumping up and down like crazy, too. The power supply, a
Kenwood KPS-15, has no problem handling ordinary speech, so I have no doubt
it can handle these fluctuations without sagging the voltage. I doubt very
much it's a power supply problem.

Knut - AB2TC


Ok, if what you say is true, then you should also be able to see the input
line power or current jumping all over the place too.  Otherwise, you are
violating the conservation of energy.  So, is the input power also jumping
in a like fashion?  Voltage jumps can occur without violating the
conservation of energy but power is indeed energy per unit time.

PEH's iPad

On May 28, 2013, at 2:48 PM, ab2tc <ab2tc@> wrote:

> Hi,
> 
> I don't think that's true. When tuning is finished the LP-100A sees the
> final SWR which is a good one, less than 1.5:1 and should be able to
> display
> the true power out of the K3. Unless the LP-100A has a really strange
> problem, which I doubt, the K3 power output is truly at levels way above
> the
> selected 20W tuning power.
> 
> Knut - AB2TC
> 
> 
> Phil Hystad-3 wrote
>> I don't think you are seeing 60 true watts.  The watt meter probably
>> measures accurately with a 1:1 SWR or 50 ohms resistive.  Since the SWR
>> is
>> what is jumping all over the place what you are seeing is the meter
>> jumping due to the SWR changes.  Now the voltages might jump in concert
>> with the SWR but if you tune at low power as recommended this should not
>> be a problem.
>> 
>> 73, phil, K7PEH
>> 
>> PEH's iPad
>> 
>> On May 28, 2013, at 2:24 PM, ab2tc <
> 
>> ab2tc@
> 
>> > wrote:
>> 
>>> Hi all,
>>> 
>>> For a while I have been quite concerned with the way my K3's power
>>> control
>>> behaves when tuning a previously unknown antenna frequency with the
>>> KAT500.
>>> The KAT500 hunts *a lot* and the K3's power output goes more or less
>>> crazy
>>> as a result. I have an LP-100A in line and it's not unusual for me to
>>> see
>>> a
>>> K3 power output of 60W or more when done tuning (tuning power is set at
>>> 20W
>>> as recommended). Is this healthy for the K3?
>>> 
>>> Knut - AB2TC
>>> 
<snip
</quote>




--
View this message in context: http://elecraft.365791.n2.nabble.com/KAT500-tuning-K3-power-control-tp7574383p7574396.html
Sent from the Elecraft mailing list archive at Nabble.com.