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I don't know anything about this PD8W code.
However, somewhere in the PD8W code it says:
? ??volatile uint32_t USB = 1200150000ULL;

That code you borrowed from Allard is treating the variable USB as a boolean,
so I assume Allard's version of the USB variable should have a value of either zero (false) or 1 (true):

if (USB) // if we are in UPPER side band mode
? ? si5351.set_freq((IF + Dial_freq) * 100ULL, SI5351_CLK2);
? else // if we are in LOWER side band mode
? ? si5351.set_freq((IF - Dial_freq) * 100ULL, SI5351_CLK2);//12-7 = 5


The two programs use the variable USB in entirely different ways.

Actually any non zero value for USB gets treated in the C language as "true" in the above code.
So I would think that snippet of Allard's code would put you always into USB mode
if you found the right spot to insert it into the PD8W code. ?(Assuming you don't fix
how Allard's code is trying to test an integer value in hz to see if it is true or not.)


Maybe you could try making up your own variable name, perhaps USBJOE
Initialize that variable to 0 for normal use as an LSB transceiver, set it to a 1
when the mode switch tells it to switch to USB mode.
Then have Allard's code test for USBJOE.

But I have no idea where Allard's code should be inserted into that PD8W code.
perhaps somebody else could help you there.

Do you have a cheap general coverage shortwave receiver?
When in LSB mode with the Bitx40 tuned to 7.000 mhz you should hear the VFO at 12-7= 5.000 mhz.
When you successfully flip to USB mode you should hear the VFO at 12+7=19.000 mhz.
That might be easier than tuning around looking for SSB signals.
You may need to put the antenna of the shortwave receiver near the Bitx40 board (or Raduino) to hear the VFO.

Jerry?

?
On Thu, Jul 27, 2017 at 07:14 pm, Joe wrote:

I have been trying various combinations. The one I have decided to work on is from?Allard PE1NWL. He provided the suggested code below:

Looks like PD8W was written to drive the BFO with CLK0 from the Si5351 instead of using the Bitx40 analog BFO.
Though that is only activated if this line turns it on:
? ??#ifdef IF_Offset

My guess is that this never worked.

The PD8W code initializes the possible BFO frequencies in hundredths of a hz with these lines:

volatile uint32_t LSB = 1199850000ULL;

volatile uint32_t USB = 1200150000ULL;

The mistake I see is that the crystal filter is not centered on 12.000000mhz, it's more like 11.997000.
The value for LSB given above is correct if the VFO is operating down around 5mhz, the BFO is 1500 hz above the crystal filter center.
But the value for USB should be more like 11.995500 mhz, at 1500hz below the crystal filter center.

If the VFO is operating up at 19mhz, then we flip them so the BFO for USB is 11.9985 and for LSB is 11.9955 mhz.

If confused, read post ? ? /g/BITX20/message/24724
Note that I made the discussion easier to follow in post 24724 by assuming the filter is centered on 12.000mhz,?
but it is actually centered on something like 11.997000 mhz.

The filter uses the series resonant mode of the quartz crystals, and that series resonant mode is a few khz lower
in frequency than the parallel resonant mode marked on the the crystal as 12.000 mhz.
The analog bfo uses the crystal in the 12.000 mhz parallel resonant mode, that frequency is brought down a little bit by
adding capacitance.?

The Bitx40+Raduino as shipped does not have the Si5351's CLK0 driving the BFO,
that would require a hardware mod.? As shipped, only CLK2 of the Si5351 is used, to drive the VFO.

Jerry, KE7ER

On Thu, Jul 27, 2017 at 07:44 pm, Jerry Gaffke wrote:

I don't know anything about this PD8W code.
However, somewhere in the PD8W code it says:
? ??volatile uint32_t USB = 1200150000ULL;

That code you borrowed from Allard is treating the variable USB as a boolean,
so I assume Allard's version of the USB variable should have a value of either zero (false) or 1 (true):

if (USB) // if we are in UPPER side band mode
? ? si5351.set_freq((IF + Dial_freq) * 100ULL, SI5351_CLK2);
? else // if we are in LOWER side band mode
? ? si5351.set_freq((IF - Dial_freq) * 100ULL, SI5351_CLK2);//12-7 = 5