I think my first post on this thread was simply incorrect.
I don't think adjusting? SECOND_OSC_USB? would fix anything.
Unless perhaps we are somehow running up against the edges of the 45mhz filter.
But then I could be wrong, I don't really understand this one yet.
I haven't messed with your code, but do plan to.
Hope to have a full digital station going, using a RasberryPi.
And hope to take a look at your code soon and give some intelligent feedback.
For now, here's some poorly thought out unintelligent feedback:
Perhaps a temporary shift of the BFO relative to the crystal filter passband?
would be a good idea.? Allows an easy zero beat of an AM station such as WWV
when calibrating the rig, for example.? Or could be used to "clarify" the reception of some ham
with a deep voice (has mostly low audio frequencies, perhaps) who has a transmitter tuned
to match it.? Other than that, I'm not sure why any sort of temporary shift would be wanted.
How does this IF-Shift feature get used?
Exactly what does IF-Shift do?
Jerry
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On Sat, Mar 10, 2018 at 01:31 pm, Ian Lee wrote:
Jerry.
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I programmed something similar to what you said.?I just added another setting instead of a constant(SECOND_OSC_USB).
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The code is shown below.
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? ? if (isUSB){
? ? ? si5351bx_setfreq(2, SECOND_OSC_USB - usbCarrier + f? + (isIFShift ? ifShiftValue : 0));
? ? ? si5351bx_setfreq(1, SECOND_OSC_USB);
? ? }
? ? else{
? ? ? si5351bx_setfreq(2, SECOND_OSC_LSB + usbCarrier + f + (isIFShift ? ifShiftValue : 0));
? ? ? si5351bx_setfreq(1, SECOND_OSC_LSB);
? ? }
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Also, I would like to ask you an opinion, but now I am using the hotspot in the place where the internet is not available, so I can not use it long.?
I temporarily shifted the usbCarrier (BFO Setting value) when IF-Shift was applied.
I thought IF-Shift was a temporary function that only used for a while, so I could not satisfy both LSB and USB.
The IF-Shift value can be set to + or -, so can set the desired value according to the using mode.
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Ian KD8CEC
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