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Ignacio,

That all sounds logical. It sounds like I need to open up the Audio
Sampling Rate from 96K to the maximum. I think it is around 197K.

I don't believe I said distortion? I said the SSB was inverted and I cannot
switch them. I have to select USB for LSB, and LSB for USB. There is no
distortion.

However, the S-Meter IS running quite high. Maybe I should back the volume
adjustment back a bit? That probably is the level input.

Thanks.

George



On Sun, Dec 5, 2021 at 9:29 AM EB4APL <eb4apl@...> wrote:

Ok, now the time here is good for responding, yesterday it was very late
(3:23 AM).

I have recovered the info of my Softrock 40 receiver (first model) and
the SoftRock II Lite that is the model that you are using, basically
both are the same.

The Softrock Lite II for use with the 9 MHz IF of transceivers uses a
11.981 MHz crystal and 1/3 sub-harmonic sampling. Sub-harmonic sampling
is used as a means to avoid high frequency crystals and while this
produces a reduction of sensitivity this is not a problem here where
there is plenty of gain before the SR. Also this technique is used in
the 20m and 30m versions of the SR without problems.

Being crystal controlled, the center frequency of the SR is fixed and
the tuning is done entirely inside the software. This center frequency
is 11.981/4*3 = 8.925 MHz. With your sound card you have +/- 192 kHz
margin around this center frequency, so you can tune from 8.733 to 9.117
MHz. Since the FT-301 D has a 1st IF of exactly 9.0 MHz, when you tune
the software to this frequency you will receive in the SR the same that
you have in the FT-301, regardless of the frequency it is tuned.

The software that I have used for this type of application was HDSDR as
I found that was quite flexible. Take in account that the LO frequency
that you enter in the software does not tune anything (the crystal rules
here) and it is only used for the display calculations. I cannot
duplicate the set up now since I do not have any 9 MHz IF rig here, but
I remember that I had configured the HDSDR to show 0 at the center
frequency so you can see how far away are the signals from the analog
rcv tuned frequency as in a classic panadapter.

I don't know why the demodulated signals were distorted, but once you
have the software running correctly we can figure out the cause.

Regards,

Ignacio EB4APL


El 05/12/2021 a las 3:23, EB4APL via groups.io escribió:

Correction to my last message: The Softrock II Lite is crystal
controlled, so you cannot tune it, I was misled by the SoftRock that I
use that is synthesizer controlled. It is too late here but I can do
the calculations tomorrow and can tell you where the center of your IF
is located.

Regards,

Ignacio, EB4APL


El 05/12/2021 a las 3:14, EB4APL escribió:

George,

Tony Parks is the father of the SoftRock series of receivers so he
have investigated the radio quite well.

Probably you?ll have to test your Softrock receiver with an antenna
and practice quite a bit with the software that you plan to use. Once
you are used to it you can connect the SoftRock to the Yaesu radio
and have the software fixed at 9 MHz so you can see your IF centered.
Since there is no digital connection to the radio you cannot read the
frequency your radio is tuned in the SDR software, but there are
configurations that make possible to indicate 0 when you are in the
IF so you have to mentally add or subtract any offset to the
frequency indicated by your radio.

Regards,

Ignacio EB4APL



El 05/12/2021 a las 1:40, George Blake escribió:

Gee, maybe you should have read what I wrote first and invesrtigated
the radio before commenting? Then you would have known what I was
talking about?

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