Eric,
There may be a small difference in the Softrock40 I and Q amplitude
that is out of range of the DSP gain/phase adjustments. I would
suggest opening your computer's Recording Control window and adjust
the Line Input Balance Control and see if that allows you null the
image. You will probably have to back to DSP Image Reject adjustment
to realize a greater than 50 dB null.
I hope this helps.
73,
Gene W3PM GM4YRE
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--- In softrock40@..., "Eric" <eric_ke6us@y...> wrote:
The radio went together fairly easily, though I'm at
a loss to figure out why an experimenter's radio is
jammed onto such a small board. This might be OK for
a production rig, but some room would be nice to
experiment.
That said, the radio works except there is no image
rejection and the DSP image rejection controls do
nothing. The instructions say, "If the image cannot
be nulled at least 50 db, then a problem exists..."
Well, some guidance would have been helpful.
Especially, given my opening criticism.
I am reluctant to tear into this think quite yet as
there is not a lot of room to work. I originally
thought it may be a transformer mis-wiring on my part.
Again, we're talking an experimenter's radio on 40
meters where things are relatively less critical than
other bands, so a little larger toroid with more room
to make changes would make it a lot easier.
I'm hoping when I fix the image problem that all
that 7.056 +/- 5 khz energy is going to at least be
diminished. 7.056 is S5. 7.051/7.061 are S3.
Anyway, I have no doubt the problem is my error. I
just want a little direction so that I can minimize
stress on the board.
Eric
KE6US
www.ke6us.com
