The easiest way for Jack to support upper sideband operation is to have folks modify their?
Bitx40 to move the BFO from 11.998500 mhz to 11.995500 mhz: ?
/g/BITX20/message/24516No change required to Jack's code.
Jack's displayed frequency will be about 3khz too high, if Jack were nice he might consider correcting?
the frequency in the display to account for the different BFO freq when the user tells him the rig is in USB mode.
The way Allard moves to upper sideband operation is to move the VFO from 5mhz to 19mhz.
The BFO stays at 11.998500 mhz, same as it is for lower sideband operation.
Tuning is now backwards, increasing the VFO frequency will decrease the 40m signal frequency.?
The only physical change required is to remove C91 and C92 from the Bitx40, they are
only required when using the 5mhz analog VFO (using L5) on the main Bitx40 board.. ??
If you want to know why moving to a high side VFO somehow flips the Bitx40 to USB operation, see this post:
? ??
/g/BITX20/message/24724In that post I put the middle of the crystal filter at a nice round 12.000 mhz so it's easy to think about,?
the filter is actually centered around something like 11.997000 mhz.
Jerry, KE7ER?
On Wed, Aug 9, 2017 at 01:35 pm, Jack Purdum wrote:
I need to investigate that with a friend of mine who uses the digital modes. I've only used the digital modes a few times, so I need to get a better picture of the easiest way to do that in the BITX environment. Truthfully, it's not at the top of the list of things I'm trying to finish up. It may be as simple as pulling Allard's routines out and putting them in mine. You might take a look at that approach.
Jack, W8TEE
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From: Joe <joeman2116@...>?
Jack, I was wondering if there is any forecast on when USB mode might added?
I ?certainly appreciate all the work and realize it takes time. ?
Looking forward to running the Digital modes ??
