When I operate CW I usually run with a lower sidetone freq, say
500hz. When I operate SSB I would like to see a choice between
1.8khz and somewhere near 3.0khz. On CW, the 400 & 250 hz
filters would be fine but which center freq do I choose?
Hi Ken,
The Paragon receives CW in USB, unlike the Omni VI which receives LSB
CW. It appears to me that the BFO frequency used for USB and CW receive
is 9.000 MHz. If I'm right about that, then you would want a 9.0005 MHz
center frequency filter to get 500 Hz audio tone. I don't think you'll
want to put a 400 Hz or 250 Hz BW filter in the 9 MHz IF, unless you
want to make it a CW only radio.
I don't think you are going to be able to have it the way you want,
using 9 MHz IF filters, without some significant modification of the
radio. You could have both of your SSB choices by replacing Y2 and Y3 ,
on the second mixer board, with 3.0 and 1.8 kHz filters, but then you
would lose the 6.0 kHz bandwidth capability (stock Y2 filter) for
listening to AM. You could replace Y3 (stock 2.4 kHz) with a 3.0 kHz BW
filter, and and put a 3.0 kHz BW filter in the 2.4 kHz slot in the 6.3
MHz IF, then use the other 6.3 MHz filter selections for your narrower
bandwidth listening.
It doesn't matter what the center frequency of the 6.3 MHz filters are
(within reason) because you can shift the frequency with the PBT
control. You could replace the 500 Hz and 250 Hz BW 6.3 MHz IF filters
with 400 Hz and 250 Hz Inrad filters, and adjust PBT for whatever audio
note you like.
DE N6KB
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