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W8TEE Display/VFO- USB - CODING REQUEST
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Jack Purdum
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 From: Joe <joeman2116@...> To: [email protected] Sent: Tuesday, August 8, 2017 4:30 PM Subject: [BITX20] W8TEE Display/VFO- USB - CODING REQUEST 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 ? Thanks Joe VE1BWV |
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The easiest way for Jack to support upper sideband operation is to have folks modify their?
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Bitx40 to move the BFO from 11.998500 mhz to 11.995500 mhz: ?/g/BITX20/message/24516 No 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/24724 In 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:
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Jack Purdum
Jerry: That sounds easy enough to do. Changing the BFO frequency involves little more than changing the BFOFREQUENCY symbolic constant that is defined at the top of the file.(I'd probably get rid of that one and add SSBBFOFREQUENCY and DIGITALBFOFREQUENCY and use those in the code.) You could then go into the routine that displays the frequency and fix an offset before it is shown. I will likely to this by adding another state to the state machine so the user can switch back-and-forth between modes. I probably won't be able to get to it before I let Rel.106 out the door since I need to test it on a working rig. (Rel 1.06 doesn't add much, but does cope with some of the display issues that have been mentioned.) It's on the list, and higher than before. Jack, W8TEE From: Jerry Gaffke via Groups.Io <jgaffke@...> To: [email protected] Sent: Wednesday, August 9, 2017 5:32 PM Subject: Re: [BITX20] W8TEE Display/VFO- USB - CODING REQUEST 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/24516 No 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/24724 In 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:
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Allard's solution makes it easier on the user, no need to switch in and out some BFO inductor when flipping between LSB and USB.
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But Allard's solution requires a VFO that can operate at either 5mhz or 19mhz. I have no idea if your DDS chip can send out a clean 19mhz, and no idea what kind of analog filter follows the DDS chip. Jerry On Wed, Aug 9, 2017 at 07:52 pm, Jack Purdum wrote: Changing the BFO frequency involves little more than changing the BFOFREQUENCY symbolic constant |
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Jack Purdum
We use an AD9850 and it's been used as a straight VFO 160-10M in the Arduino Projects book, so I think it would work fine. What I suggested does not involve any hardware at all. Simply a new state added to the already-exiting state machine. All it would take is a press on the rotary encoder switch to move to the Digital mode and another press to lock it in.? Jack, W8TEE From: Jerry Gaffke via Groups.Io <jgaffke@...> To: [email protected] Sent: Wednesday, August 9, 2017 11:07 PM Subject: Re: [BITX20] W8TEE Display/VFO- USB - CODING REQUEST Allard's solution makes it easier on the user, no need to switch in and out some BFO inductor when flipping between LSB and USB. But Allard's solution requires a VFO that can operate at either 5mhz or 19mhz. I have no idea if your DDS chip can send out a clean 19mhz, and no idea what kind of analog filter follows the DDS chip. Jerry On Wed, Aug 9, 2017 at 07:52 pm, Jack Purdum wrote: Changing the BFO frequency involves little more than changing the BFOFREQUENCY symbolic constant |
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