[Elecraft] strange tuning effect on k2

[W3FPR - Don Wilhelm]

Carel,

Check the choke RFC15 with an ohmmeter - the voltage check will not suffice.
I haven't investigated why, but the PLL chip shows 5 volts on the pin the
choke is connected to even when the choke is open.

When doing CAL PLL, the frequency count starts from the PLL high frequency
value (seen in CAL FCTR mode after tapping BAND+) and does not depend on any
particular frequency within the 40 meter band.

If RFC15 is open, you can replace it with a jumper until a replacement is
obtained.

73,
Don W3FPR

> -----Original Message-----
>
> Checked the choke RFC15= ok. I do have 5V on both sides of the choke.
>
> One strange behaviour is that when I perform PLL lin. I set the
> K2 to 7.050
> MHz . But when I perform the PLL lin. (by connecting to TP1 and measuring
> the VFO freq) it goes to 12.094 MHz, which is 12.094-4.9136 =
> 7.1804 MHz. So
> NOT the 7.050 MHz ! Is that normal behaviour ?
>
> I can see that during the PLL lin. the VFO freq drops very smoothly from
> 12.094 to 12.085 (verified that with an external receiver on 12
> MHz) and the
> PLL lin. stops with an "end" message.
>
> But stil when tuning, the 10Hz steps are not there !. Voltage on
> D16/D17 and
> also the DAC U5 output  goes wild when turning slowly the freq.
> knob. On the
> other hand the VFO voltage (at R30) is very smooth and well in
> normal range.
> So it seems the DAC is programmed with rather erratic
> data....could it be I
> have a defect EEPROM ? (it stores ok other things like S-meter Low/High
> though...)
>
>
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