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Hi,?
My ubitx v6.1 don't memorize the setup of frequency alignment. I have the rtx sintonized at 10000 KHz, USB CW, tone 1 KHz, on artifical dummy load and read the frequency out put of 10002.1 KHz. In LSB Cw read 10000.1. In setup frequency alignment I set - 2000 Hz and press the button. Then I switch off and then on. Nothing to do, the frequencies are the same. I have do also the pressing of Ptt, anything change. Where I am wroughting.
73, de IK0XBC Andrea?
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IK0XBC,
Review the steps in this video from Ashhar Farhan:
73
Evan
AC9TU
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Hi Evan,?
In CW tx mode we have only one conversion. My problem is to do accept the correction frequency to eeprom. I think that the one step in setup corrispondly to 1 Hz; if I change this value in setup to - 2000, I will have that on display is 10 Mhz and the effectly rf output chance only for selection of LSB or USB mode.?
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IK0XBC,
I am sorry, but I do not understand your question.??
I believe you are trying to adjust the frequency alignment of your stock V6 uBiTx.? That is best done using the method Ashhar Farhan uses in the video.? If you do not have an AM radio station near you that you know the frequency of the carrier, you can use a signal generator set to a very low level.
Note:
- The V6 software provided by HFSignals offsets the transmitter from the dial frequency by the amount of the sidetone setting.? So, if the sidetone is set for 600 Hz, the transmitted frequency on CW will be either 10,000.6 kHz or 9,000.4 kHz, depending on the USB/LSB setting.
- The software does not use the current setting of the calibration values (master clock or BFO) when you go back to change it again.? It always starts with the default value.? You must write down the value and then save it to the radio.
Assuming your 开云体育 ID is your call sign, you are in Italy, and English may not be your native language.? That will make it difficult for us to communicate as I understand only English. This will require patience and understanding on both our parts.
73
Evan
AC9TU
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Hi Evan, you'll excuse me for always addressing you, but I've seen that you're very active on the group.? I am grateful for the advice you give me, but my uBITX V6.1 must have some problem in the control part of the system, because I have been working on it for eight months now with both the Ashfar and CEC software ( and related Nextion display) and I can't figure it out.? In the best situation I had LSB/USB inverted and inaccurate frequency.? Unfortunately here in Italy we no longer have AM stations in both MW and SW.? Even Vatican Radio almost made a switch-off.? Now to simplify the situation I ask just one question.? Given that with Ashfar's SW 6.1 and stock display, I follow its operating instructions, why if I go to the Setup/Frequency Setting and set - 2000 or +2000, save, turn off and on again, the transmission frequency doesn't change?? If I measure the clk02 and 01 as I rotate the tuning, the frequencies vary as expected.? 73, by IK0XBC Andrea - City Rome - Country Italy.
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I also have this problem, with my stock uBitx V6 (purchased new from Gigaparts, in early August). With the receiver tuned to WWV at either 10 or 15 Mhz, zerobeat (in LSB mode, not CW) occurs around 9998.4 Khz. After setting zerobeat in Freq Cal setup (for exactly 10 or 15 Mhz), I press the tune knob, and return to normal operation. However, the zerobeat frequency remains where it was before.
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Andrea, maybe you can listen to Radio Malta on 999 kHz
On Tue, Oct 3, 2023 at 7:47?PM DaveW, KL7HJF < david@...> wrote: I also have this problem, with my stock uBitx V6 (purchased new from Gigaparts, in early August). With the receiver tuned to WWV at either 10 or 15 Mhz, zerobeat (in LSB mode, not CW) occurs around 9998.4 Khz. After setting zerobeat in Freq Cal setup (for exactly 10 or 15 Mhz), I press the tune knob, and return to normal operation. However, the zerobeat frequency remains where it was before.
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DaveW,
Pressing the encoder after adjusting the calibration (master or BFO) saves the new value to EEPROM.? The new value is not used in normal operation until you turn it off and then turn on the radio.? That is one reason to save the value before pressing the encoder.? Then, you can adjust that value on the next test.
IK0XBC,
I believe the values are too close for you to notice a difference.? The correction factor can be from -2800000 to +2800000.? Internal to the program, each 1 Hz is 875 on the calibration values.? So your +-2,000 change is about 4.5 Hz.? The minimum tuning value is 10 Hz.
Try -200,000 and +200,000.? Most radios I have worked with are in the 140,000 to 200,000 range.? I have yet to see a negative correction factor, even though the software does allow it.? Others may have seen a negative value.
73
Evan
AC9TU
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Thanks Evan for this information, I didn't know that.? I will put the rtx back on frequency and try to correct on this basis.
73, de IK0XBC Andrea?
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Evan, Thank you for that info. I did not know the radio had to be turned off and back on, before the setting would be applied. Right now, band conditions prevent hearing WWV, But they probably will improve this evening. Thanks again.
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Well... I checked freq. cal. this evening, when I could receive WWV. The frequency at zero beat reads 14,997.250 Khz. The frequency calibration window starts at zero, and goes plus or minus from there. Zero beat occurs at about -700. Press knob in. Turn unit off and back on. WWV zero beat freq. is still 14,997.250 Khz.
Also, I don't understand the numbers given to IK0XBC in post 105405 (above). +/- 200,000 would be a lot of turns on the dial.
For BFO cal., the number starts at 11,053.0. If setting BFO cal. for the first time (for example, on a newly loaded Arduino Nano, without eeprom data), how far should one expect to turn the dial before reaching the proper range. (The factory Arduino BFO is about where it should be. But I have another Arduino, with v6.3.1 software, on which tuning the BFO cal. causes volume change in static, but no pitch change.)?
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DaveW,
Did you follow the steps in this video?
You should do all of the steps:
1 - Adjust the BFO using the BFO tuning aid to be able to hear the low tones.? Set and restart.
2 - Tune to the frequency that the AM station should be on and then start the calibration.? Set and restart
3 - Adjust the BFO for the best audio for voice.? Set and restart.
Note that the tuning rate for the calibration setting does not increment by single digits.? It is stepping at the equivalent 1 Hz rate.? The video's calibration endpoint is around 140000 (138250).?
If you do not have a v6 uBitx, then the default for the calibration depends on the version.? Some software does increment the calibration factor by 1 and would take a lot of turning the dial to calibrate.? I am unsure why it was done that way, as the 875 step function is in the Si5351 setup.
Several spreadsheets have been developed to help in calibration.? I have not found one that works for me.? In the Nano code, there is a suggestion to take the current calibration factor and use a ratio to adjust for the new calibration factor based on the frequencies desired and measured.? The stock v6 software does not make this easy, as you can not get to the current value.? Once you can start from zero, record each setting as you get closer.? You would need to adjust by a larger value than 2000 as the endpoint is likely around 140000.
You should note that the sidetone adjusts the transmitter output on CW.? It depends on the sideband setting.? Depending on the sideband setting, the transmitted frequency is the dial plus or minus the sidetone.? This is not the standard operation for CW.? Most radios transmit at the displayed frequency, and you adjust the receiver to either sideband.? The default for the stock software is 800 Hz.? As far as my code search could find, there is no way to change this.? I no longer have a v6 that runs the stock code.? I use either N8ME or a v6 with the Teensy instead of the Nano that runs custom code.? That means I can not verify the operation.
If you develop a calibration method based on a frequency counter, it will help others to save it in the Groups WiKi.
73
Evan
AC9TU
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I’m a long way out from having dealt with the microbit axis and of course following the prescribed procedure would be more successful than otherwise.
However, one of the things I often did was to simply listen for the fundamental of the crystal oscillator of the SI 5351 on a high-quality receiver (if available), note its exact frequency, and then change the listed crystal oscillator frequency in the software; recompile. ? on the unit or two that I worked on, there was usually a few kilohertz error.
That fixes the basic frequency numbers within the radio but does not match the BFO frequency with the particular crystal lattice filter in that particular unit. ? Simply observing the background noise spectrum on any piece of software that has a waterfall allows you to see a good bit there and then adjustments can be made. ? ??
However, those techniques require understanding of how the system works as well as some high quality test equipment. So the published techniques are probably more useful for people just beginning and without other equipment!!
It’s amazing what has been accomplished to bring all of these different systems to market. ? It’s (relatively) easy to build a prototype (magazines are full of them), it’s much more difficult to bring something to market.?
73
toggle quoted message
Show quoted text
On Oct 4, 2023, at 05:42, Evan Hand <elhandjr@...> wrote:
?DaveW,
Did you follow the steps in this video?
You should do all of the steps:
1 - Adjust the BFO using the BFO tuning aid to be able to hear the low tones.? Set and restart.
2 - Tune to the frequency that the AM station should be on and then start the calibration.? Set and restart
3 - Adjust the BFO for the best audio for voice.? Set and restart.
Note that the tuning rate for the calibration setting does not increment by single digits.? It is stepping at the equivalent 1 Hz rate.? The video's calibration endpoint is around 140000 (138250).?
If you do not have a v6 uBitx, then the default for the calibration depends on the version.? Some software does increment the calibration factor by 1 and would take a lot of turning the dial to calibrate.? I am unsure why it was done that way, as the 875 step function is in the Si5351 setup.
Several spreadsheets have been developed to help in calibration.? I have not found one that works for me.? In the Nano code, there is a suggestion to take the current calibration factor and use a ratio to adjust for the new calibration factor based on the frequencies desired and measured.? The stock v6 software does not make this easy, as you can not get to the current value.? Once you can start from zero, record each setting as you get closer.? You would need to adjust by a larger value than 2000 as the endpoint is likely around 140000.
You should note that the sidetone adjusts the transmitter output on CW.? It depends on the sideband setting.? Depending on the sideband setting, the transmitted frequency is the dial plus or minus the sidetone.? This is not the standard operation for CW.? Most radios transmit at the displayed frequency, and you adjust the receiver to either sideband.? The default for the stock software is 800 Hz.? As far as my code search could find, there is no way to change this.? I no longer have a v6 that runs the stock code.? I use either N8ME or a v6 with the Teensy instead of the Nano that runs custom code.? That means I can not verify the operation.
If you develop a calibration method based on a frequency counter, it will help others to save it in the Groups WiKi.
73
Evan
AC9TU
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Hi Evan,?
I applied the correction factor 1Hz=875 on the display, therefore 165050. Now the Main Clock (Clk#2) is aligned at 55 MHz and verified with a frequency meter calibrated with GPSDO.
I continued with the work, and I realized that Clk#1 did not vary with the lsb/usb command. It remained at 56.050 MHz.
At this point I took Farhan's V6.3.1 sketch and tried to compile it with Arduino IDE V1.8.19.
A series of error messages.
Attached is the pdf file with the reported errors.
I would ask you and the other users of the Group who read us, where to correct the source to have a correct compilation.
Thanks to all.
73, de IK0XBC - Andrea - Roma - Italy
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Andrea,
Did you follow the readme instructions?
I believe that you are not in the correct folder/directory per the instructions.
I know of a bug in the stock software that requires changing the frequency slightly to change sidebands.? I would try that.
73
Evan
AC9TU
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In case of the adjustment not store on memory on ubitx through PTT press, then use bitx manager software to make the changes and upload.? Thanks de VU2TDD BIJU A P?
Hi,?
My ubitx v6.1 don't memorize the setup of frequency alignment. I have the rtx sintonized at 10000 KHz, USB CW, tone 1 KHz, on artifical dummy load and read the frequency out put of 10002.1 KHz. In LSB Cw read 10000.1. In setup frequency alignment I set - 2000 Hz and press the button. Then I switch off and then on. Nothing to do, the frequencies are the same. I have do also the pressing of Ptt, anything change. Where I am wroughting.
73, de IK0XBC Andrea?
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Hi Biju, what you suggest is used with CEC software.?
Thank you.
73, de IK0XBC Andrea?
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Hi Evan,?
you're right, you remember well about the bug.? When switching LSB/USB it is necessary to move up or down a little and clk#1 switches.? But I saw that the display command is reversed.? If I choose USB I should have 33,994.48 Khz while I have 56,000.50 KHz and vice versa.? Probably another bug.? Just let him know and move on.? Now I'll move on to the BFO.? I will brutally put in front of the Mike a bf generator with the frequencies of 300 + 2700 Hz, and I will see the RF signal via PC and sdr-rtl + hf converter.? Then I will generate a bf of 1 KHz and calibrate according to what I read on sdrsharp.? Obviously everything will be done after calibrating the receiver with the GPSCO signal.? The adventure continues.
73, de IK0XBC Andrea?
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Andrea,
As I understand mixer operation, the signal that has the lower frequency is inverted.? If that holds true, the first IF inverts to LSB, and then the second IF would invert again if the LO is above 45 MHz.? If it is below, the signal is not inverted.? The BFO LO is set below the 11.059 MHz crystal filter to take advantage of the steeper slope on the upper edge.? That would mean that any signal remains the same sideband.? ?Assuming all before is correct, you should measure approximately 56MHz for USB and 33MHz for LSB, as you have.
73
Evan
AC9TU
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Hi Evan,? I noticed the sidebands being reversed in the stock firmware myself when I made my own version of the firmware, and changed it in my version, then injected a carrier in the sidebands to verify.
I recently helped another person on this group who was experiencing the same problem with the N8ME software.? I made a mod to one N8ME file to swap the clk 1 frequencies and he tried it and said that it fixed the problem for him.??
The block diagram here () says that clk 1 should be at the lower frequency for USB.??
I'm not sure if there could be some other adjustment issue that might contribute to this or not.? ?I need to sit down and try to logic through the whole chain to see if I can figure anything out.
Or maybe you can see something and let us know.
73,
Rolan
N8LOV
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IK0XBC
Biju Apkrcl