Thanks Don, I think I can get a handle on most of that except the
swapping LSB/USB. If my interpretation is correct I should generally set
the K2 to RTTY without Rev and it'll automatically select LSB or USB
depending upon band? Rev would be used only in special circumstances?
I'll dig through the parts box for a capacitor tomorrow, get the filters
set up again, and give it a shot.
Thanks. 73, Dennis
On 2/19/2014 8:44 PM, Don Wilhelm wrote:
Dennis,
First a clarification - if the band is below 15 meters, RTTY is LSB
and RTTY REV is USB.
You don't have to worry about that on bands above 15 meters because
the K2 automatically makes the corrective swap, but when aligning the
filters, use a band below 15 meters so as not to mix the sidebands.
Secondly, since you run out of range when aligning the 400 Hz filter
width at 1000 Hz, your BFO range is not correct (too high) on the low
frequency side. That can usually be corrected by adding a small value
capacitor (10 pF to 22 pF) between the junction of the crystals and
C174 and ground - a capacitor between pins 6 and 3 of U11 is a good
place to insert it. Check the BFO range against the manual range
limits after adding the capacitor and adjust the capacitor value as
required.
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