Steve,
C22 has no effect on the received frequency or the beat note during
normal operation.
The setting for C22 is only used during a run of CAL PLL and CAL FIL
when the frequencies (actually equivalent DAC values) are stored in EEPROM.
Once that has been accomplished, the 4 MHz reference oscillator serves
only as the clock for the MCU and for that function, the exact frequency
is not important.
If you want to do a calibration run on your K2, I suggest you review the
K2 Dial Calibration article on my website www.w3fpr.com.
73,
Don W3FPR
On 11/6/2014 3:50 PM, Steve Kavanagh wrote:
I just acquired a second hand K2 (my second one) and upon going thru the
operation in detail I noticed that it was somewhat off frequency. WWV at 10
MHz is received best (on USB using the CW filter - there is no SSB board) at
10,000.96 MHz and adjusting C22 has no discernible effect on the beat note
while listening to WWV tuned slightly off frequency. I took the control board
out and saw that C22 is soldered on both sides. But the only possible cause I
can think of for this behaviour is that C22 is either not making contact (bad
solder joint) or is defective. Am I missing any possibilities ?
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