[Elecraft] BFO on wrong sideband?

[Hector Padron]

The web site provided is not active,my IE did not find it,could anyone tell what's the correct address? I am very interested to see it,thanks
 
AD4C
 


"The difference between genius and stupidity is that genius has its limits".. -- Albert Einstein

--- On Sat, 7/18/09, Tom Campie <tom.campie at gmail.com> wrote:


From: Tom Campie tom.campie at gmail.com


On Jul 17, 2009, at 10:13 PM, Don Wilhelm wrote:

> Tom,
>
> Go to my website www.w3fpr.com and study the article on K2 Dial  
> Calibration.  Part 3 of that article deals with setting the K2  
> filters.  If you are not familiar with the use of Spectrogram for  
> setting the K2 filters, I strongly suggest that you become familiar  
> with it.  Once you have used Spectrogram for that task once, doing  
> it a second time is like "falling off a log".  Your K2 performance  
> will be much better for the effort, and your ears will thank you.
>
> Yes, it is easy to get the BFOs on the wrong sideband by accident.   
> Tune to a band below 15 meters when setting the filters - 40 meters  
> is recommended for consistency, but others will do.  There is a  
> sideband reversal that takes place at 15 meters and higher, and  
> using those bands for setting the filters will only cause confusion  
> and the resulting frustrations that accompany such confusion.
> To prevent having the BFO on the wrong sideband, remember that the  
> CW filter BFO frequencies (and/or DAC values) must be lower than the  
> CWr BFO frequencies.  Normal CW BFOs will have a frequency in the  
> 4912.8 to 4913.5 kHz range while the CWr BFO frequencies will be in  
> the 4914.2 to 4915.5 kHz range.
>
> Likewise, the SSB USB BFO frequencies will be higher than LSB and  
> the RTTYr BFOs will be higher than the RTTY BFOs.
>
> Do these things in order.
> 1) Set the 4 MHz oscillator - use Wayne Burdick's (N6KR) method and  
> view the 500 and 600 Hz tones transmitted by WWV on the Spectrogram  
> display to be certain you have tuned WWV correctly (the K2 should be  
> in LSB or USB mode).  Then enter the menu for CAL FCTR  and  
> alternate the internal counter probe between TP2 and TP1 while  
> adjusting C22 - you are looking for the point where the lower order  
> digits on the display are the same at both points.  The frequency at  
> TP1 moves about 5 times faster than at TP2, so when doing the  
> adjustment of C22, put the probe in TP1 - it is just easier that way.
> 2) Run CAL PLL (remember to put the probe in TP1 and the band to 40  
> meters).
> 3) Now put a noise source on the K2 antenna input and adjust the BFO  
> frequencies (CAL FIL) to place the filter passband at the desired  
> frequency on the Spectrogram display.  Do that for *all* BFOs.  If  
> the passband position is already correct, move it up a notch and  
> then back to the original - that will tell the K2 that the BFO has  
> been changed and it will write new EEPROM values based on the new 4  
> MHz oscillator frequency, and that is exactly what you want to  
> accomplish.
>
> When you are done, check the tuning of WWV - it should be within 20  
> Hz which is the DAC limit or the K2 (look at the tones transmitted  
> by WWV to verify)
>
> 73,
> Don W3FPR
>
> Tom Campie wrote:
>> I just got my K2 used and I went through and adjusted the CW  
>> filters  because I like mine lower than the previous owner but i  
>> have  a  feeling I botched it up - I'm zero beat to the ARRL at  
>> 14.046.84, and  they transmit on 14.047.5 MHz.    I also tried re- 
>> aligning the VFO  based on a zero beat on WWWV so I'm not sure  
>> where I'm wrong.  Please  help!
>>
>> Tom W0EA
>>

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