K2: different power drain

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K2: different power drain

oe9fwv
hello K2-specialists,

I have a question regarding the reading of the internal ampere meter.
When I tune the radio with max. power, I see different readings on
the various bands. On 40m I see 1.8 A, on 30m 2.1 A and on 20m 2.5A
Is this normal or a sign of a problem or mis-allignment?


73! de Werner SV9/OE9FWV/p



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Re: K2: different power drain

Don Wilhelm-4
Warner,

That is quite normal.  The transmit signal chain does vary in gain from
band to band, and is usually greater on 40 meters - the result is that
less current is consumed for any given power level if the gain is
higher.  The K2 power control circuit keeps the power constant even
though the per band gain varies.

Another subtle (and somewhat related) observation  that can be made as a
result of the power control circuits is that the power will stay the
same as the power supply voltage is changed - if the power supply
voltage is decreased, the K2 current consumption will increase to
maintain the requested power output level.

73,
Don W3FPR

Dr. Werner Furlan wrote:
> hello K2-specialists,
>
> I have a question regarding the reading of the internal ampere meter.
> When I tune the radio with max. power, I see different readings on
> the various bands. On 40m I see 1.8 A, on 30m 2.1 A and on 20m 2.5A
> Is this normal or a sign of a problem or mis-allignment?
>
>
>  
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