Hi Mick:
>Just about finished building and got the first watts out of my K2.
Congratulations!
>However I need some advice please
Whoops...
>1. If I tune to a carrier on F1 (ie filter position 1), at the same
>pitch it is 1 KHz higher on F2,F3 and F4 (which are all the same)
>Presume this is about BFO adjustment but can't see where to go. Any
>advice please - apologies in advance as I think this is probably a
>pretty simple mistake by me!.
When you find that one (or more) of your XFIL settings causes you to
have to tune 'elsewhere' to 'find' the signal, this is almost always
the result of having placed the BFO to the wrong side of the filter's
center frequency (e.g. to the opposite sideband).
Assuming you are on 40M (or any band BELOW 15M), all of the BFO
Freq./DAC values for CW Normal XFILs should be BELOW the recorded
center freq. for the filter. For CW REVerse, all values should be
ABOVE the filter center frequency. Note that as you narrow the
bandwidth of the filter, the filter CENTER freq. will drop slightly,
so it's always best to re-check to confirm exactly where the center
freq. is when you switch to the next filter setting. However, the
filter center will NOT change if merely switching between CW N and CW
REV, just as the bandwidths change.
If you haven't considered doing so, you might want to try downloading
a copy of Spectrogram v5.1.7 from my web site at www.n0ss.net (from
the K2-Specific page), and also a copy of the XFIL alignment docs
which appear just below the link to download Spectrogram (same page).
>2. I find that tuning L1, L2 ,L3 and L4 is very broad - no very
>obvious peak? Is that right? - receiver seems sensitive enough but a
>bit low on gain using headphones (without preamp).
Without the PREAMP, you may find sensitivity a bit low on 20M and
above. Generally sensitivity is more than adequate between 160M and
30M without the preamp.
Cheers,
Tom Hammond N0SS
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