you wrote:
> Am Presently using the k2 proset but my audio reports are less than
> flattering ..John K1GUN
Hi John,
If are getting poor audio reports with the Proset-K2 this indicates that your
transmit BFO settings (BF1t) for both USB and LSB are not optimally adjusted.
The default BF1t settings in the KSB2 manual are just starting points and BF1t
should be adjusted for best transmit audio for both USB and LSB. Shifting
BF1t will move your transmit passband up or down, allowing you to emphasize
your natural voice frequency characteristics. +/- 100 to 200 Hz in these
settings can make a huge difference in your transmit audio quality.
This procedure is detailed in the last part of the KSB2 manual and I've pasted
the text below:.
---
SSB Transmit BFO Optimization (Important)
When you transmit using SSB mode, the fixed filter on the SSB adapter is
always used (OP1). The way your voice sounds to other stations depends on the
BFO settings for this filter (i.e., BF1 in CAL FIL). Table 3 provides BF1
values for LSB and USB based on the measured crystal filter frequency (from
page 10). However, you may have to experiment with these settings, adjusting
them slightly to obtain best voice quality. You can use another ham-band
receiver, or ask a nearby station listen to your signal as you vary BF1. Use
CAL FIL, moving the BFO as much as +/- 200 Hz from the frequencies shown in
Table 3. Start with lower sideband, then upper. Moving the BFO too close to
the filter will worsen carrier rejection, so be sure to re-check carrier
amplitude whenever you change the BFO setting.
Note: The BFO settings for LSB and USB are swapped on 15, 12 and 10 meters due
to the K2's frequency mixing scheme. If you use 17 m or below for making BFO
changes, the following rules apply: LSB: moving the LSB BFO lower in frequency
will raise the voice pitch and improve carrier rejection. USB: moving the USB
BFO higher in frequency will raise the voice pitch and improve carrier rejection.
---
73, Eric WA6HHQ
Elecraft
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