Operation cont’d
Filter… Selects PowerSDR DSP filters. These can be set differently than K3 if desired (for instance to listen to a wider CW passband
than what is selected in K3).
Width and Shift… Apply to PowerSDR IF shift controls.
RX EQ… enables graphic equalizer for PowerSDR receiver. The equalizer can be set in the Equalizer pull down menu at the top of the
program.
RX Meter… allows several different modes for the S-Meter
Pan & Zoom… adjusts the portion of the passband that is displayed in the panadapter. Wide display is far left in zoom bar, PAN should
be centered.
In normal operation, The panadapter sliderule display moves as you tune the K3. You can also left click and drag the display to tune the
K3. Right clicking will display a crosshair which can be used for “point and click” tuning to the signal under the cross hair. Left clicking
while the crosshair is centered on a signal will snap that signal into the passband of both PowerSDR and the K3. You can fine tune
using the thumbwheel on your mouse, or the main tuning on the K3. You can listen to just the K3, or to just PowerSDR or both. If the
global offset has been set properly, they should sound the same.
Currently, PowerSDR-IF Stage does not support tuning of the sub receiver from the K3’s VFO-B knob, except in an alpha release. It will
be supported in the next release. Support for this already exists in LP-Bridge. When it’s supported, VFOB will be linked to the sub rcvr.
Click on SubRX to activate it. Normally, the main receiver audio goes to the left speaker and the sub receiver audio goes to the right
speaker. You tune the sub receiver by grabbing the blue passband bar and sliding it left or right, or tuning VFOB on the K3.
LP-Bridge provides IF offset feedback from the K3. This is needed because of the various filter offsets, as well as during adjustment of
the K3’s DSP controls. As the controls are adjusted, the 1
st
IF signals shift within the K3 passband. These shifts are corrected later in
the K3’s DSP, but of course that doesn’t help the panadapter. The tracckig offset feature of LP-Bridge keeps the PowerSDR IF
centered with the K3 IF, even when adjusting the DSP shift control or changing filters in the K3. When adjusting IF Shift while tuned to a
carrier, you will notice a little “warble” in the PowerSDR audio. This is caused by the latency of the serial connection to the K3 creating a
delayed correction for PowerSDR centering. It is barely noticeable on normal signals.
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