Re: K2: Is there an ideal power supply voltage?

Posted by Don Wilhelm-4 on Dec 31, 2010; 10:51pm
URL: http://elecraft.85.s1.nabble.com/K2-Is-there-an-ideal-power-supply-voltage-tp5883081p5883090.html

  Andrew,

For K2 receive, as long as the power supply voltage is between 9.5 volts
and 15 volts, there will be no change in receiver performance.  The
receiver circuits all operate on the output of the 8 volt regulator
(well, except for the AF Amp) which will supply 8 volts until the
voltage drops below the regulator's dropout voltage (it is a low dropout
regulator).

For the same reason, a voltage change will not change the receiver
alignment.

The 4 MHz reference is not critical during operation since it is not
used dynamically.  It is important that it be aligned just before doing
a CAL PLL and/or a CAL FIL operation - it is used at that time to store
DAC values into EEPROM, and those DAC values do depend on the frequency
measured by the internal counter probe - and that frequency is dependent
on the 4 MHz reference oscillator frequency at that time.

73,
Don W3FPR

On 12/31/2010 5:28 PM, Andrew Moore wrote:

> While the K2 is capable of operating from a range of input voltages, is
> there an ideal power supply voltage it prefers to see for best receiver
> performance? If so, what is that voltage (as indicated on the K2 LCD when
> "DISPLAY" is pressed twice)?
>
> Would the K2's receiver performance benefit from a realignment (filters/BFO,
> IF, 4.0 MHz oscillator, etc.) after the power supply voltage is change? (as
> impractical as that may be in real life)
>
> Thanks,
> --Andrew, NV1B
>

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