[Elecraft] JT modes alignment

[Don Wilhelm]

Jean-Marc,

Yes, you will need to align those filters.
I normally set the FL1 position to OP1, FL2 to 1.00, FL3 to 0.70 and FL4 
to 0.40 widths.
Then set the BFOs for FL1 to the same values as the SSB filters - RTTY 
corresponds to LSB and RTTY REV corresponds to USB.  That filter will be 
used for transmit in all cases and works well with a waterfall display 
for normal receive.
Set the other filters to center on 1000 Hz.  Those can be used if a 
strong interfering signal appears inside the passband of the OP1 
filter.  Observe the LSB/USB relationship - the DAC numbers (and also 
frequency) will be higher for RTTY REV.

If you have the KDSP2 option, also set those filters 2, 3, and 4 to 
center at 1000 Hz to agree with the IF filter centers.

The use of Spectrogram is recommended when aligning the IF filters. You 
can download a copy from my website www.w3fpr.com - look near the bottom 
of the home page.  Instructions for the use of Spectrogram can be found 
in the K2 Dial Calibration article.

73,
Don W3FPR


On 2/11/2014 3:07 AM, F5LCI wrote:
> Hello,
> After successful use of JT65 with my KX3 overseas, I am back to my K2.
> According to the manual, the "r" mode is advised, because passband and ALC
> are optimized.
> (I never use RTTY)
> On my rig, the "r" mode, as the reverted "r" mode, give the same reverted
> tones on the wsjt window, and no decode, of course.
> Is JT65  impossible on this mode, or do I have to reconsider the filters
> alignment or anything else ?
>
> Best 72 de Jean-Marc, F5LCI
>
> "To nobody, except those who will take pleasure here" (Franz Schubert,
> 1797-1828)
>
>
>
> --
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