Kev,
Great about your K2 completion.
For doing CAL PLL again, check the accuracy of your K2's frequency. Do
that on the highest frequency you can receive a known frequency signal -
as long as that frequency is in the 17 meter band or lower. If the
frequency is within 20 Hz of the correct dial reading, don't bother.
OTOH, if the frequency is not correct, then yes, setting C22, followed
by CAL PLL and then CAL FIL should correct it. See the procedure for
setting C22 on my website www.w3fpr.com.
If the known frequency signal is not an AM station, things get a little
more complicated in determining the correct tuning of that station -
send me a private email and I can help you with the correct tuning.
Bottom line -- if your frequency readout is not correct, then you will
have to go through the full process of setting C22 followed by CAL PLL
and CAL FIL within a short period of time.
The 4 MHz reference oscillator is only controlled by the 4 MHz crystal
and can drift over time. The exact frequency of that oscillator is not
critical for normal operation, it is only a clock for the MCU. However,
before running CAL PLL and CAL FIL, it should be set accurately if you
are to achieve correct dial frequency readout -- so do the entire
process in "one sitting" so the 4 MHz oscillator does not drift
substantially during the process of setting C22, running CAL PLL and CAL
FIL.
73,
Don W3FPR
On 2/5/2015 10:51 PM, Kevin Schache wrote:
WOW!!!
This building project has been fantastic. I've certainly learned or
relearned heaps...
Thanks to Elecraft and all those who have helped me along the way, I
am extremely happy with results.
Everything is now complete and all seems to be working well but I
can't recall if I did CAL PLL after resetting c22 in my final alignment.
If I repeat CAL PLL on my K2, does that mean that I must redo CAL FIL
and all filter alignments again?
I did filter alignments using a noise generator and Spectrogram and
the graphs appear much as the examples in Don's W3FPR alignment
instructions, but I'm not too sure exactly what I am looking for In
Spectrogram. I simply tried to get graphs to be as similiar as
possible to the examples. Apologies for dumb question but, Is there
something special I should be looking for? Something to be minimised
or maximised in the graphs?
If I do CAL PLL and CAL FIL again, does that mean I should also redo
KAT100 settings?
I've also built the cable between k2 K102 and PC and all tests ok.
I've not made any on air contacts yet with this rig other than into a
dummy load and some testing of my antenna with KAT100.
I wanted to get alignments done as well as possible first.
Maybe I'll get my feet wet this weekend!!! :-)
______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[email protected]
This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to [email protected]
