Thanks to you and also to Michael :-) Your explanation was understandable to me, no problem. I also do not have such a precise frequency counter. The idea of doing this together with my signal generator and the oscilloscope in XY mode is a very good solution :-) I´ve done it in the same way and the TX and RX signal sounds much better......great!!
good morning Charlie, It appears my original assessment of the signal maybe not sitting in the passband correctly ( due to frequency errors) may have been correct. The radio is sounding a lot better and all the oscillators will be a lot closer as you have calibrated your board against your signal generator ( which will be calibrated in the factory to some reasonable accuracy ). I am glad your now seeing the benefits of calibration and the difference in the two approaches to achieve the same outcome. Keep up the excellent video's best 73's Simon
I see you have an oval speaker for your audio. I've tried all sorts of speakers and I've found that an oval speaker in a simple bass reflex box is easiest for me to understand both SSB and CW. Although when I get serious about reception I use my old headphones. I really enjoy the way you present your projects. I feel smarter after each video you do. I sometimes watch one like this one 2 or 3 times until I fully grok how things work.
W2AEW has a video of using WWV at 5, 10 or 15 MHz as a reference. He tunes off the carrier to zero beat the VFO to the same tone. Using your ear you can get pretty close and then using the S-Meter to watch the beat you can get really close. Worked well for me with two Si5351 cards.
I mitigated the issue by putting a resistor near the xtal to create "TXCO" haha... It is hot but at least it is constant. Great video, keep safe and 73 de 9A3ICE
I would have thought having a PLL would have compensated for temperature drift. Maybe using this as a signal generator really isn't as great as I thought? I thought it should be much more rock solid - I mean, I guess it is way more rock solid than something like a basic colpitts oscillator without a crystal. At least there is a crystal involved. I wonder how much the drift is over temp I experimented with my si5351 a bit (I'm only running it at 1.60Mhz) and even with my finger or hot breath on it, it only drifts by 1hz so far. I'd have to experiment more though.
Hi Charlie got to bottom of it the code had been altered on what should have been displayed on there serial monitor I have mapped the keys with using UK keyboard and everything now tallies with what's shown on the serial monitor and now get the error and can now correct the freq using counter will try it later using a scope thanks again terry
Hi Charlie i have been following this build when I use Jason Mildrums same calibration library when I use the serial monitor interface I don't get the ref keys to use I don't actually get any I basically get 2 lines one shows actual BFO the other shows same same VFO on the 12c display has this code been changed ? regards terry
Jason did update the library some time ago. I don't have any problems with the calibration sketch. I assume the baud rate is correct. I have had some strange things happen where i had to set the serial monitor at either 2x or 1/2x the sketch baud rate.
Hi Charlie. I´m from Argentina and im doing my final proyect, an antenna analyzer based on si5351. Im having problems with the resolution. I need two outputs of the si5351. One has to be 1 khz higher than the other. In 50 Mhz and higher , for example if i want 50.001 Mhz my oscilloscope show me 52 o 55 Mhz, is too far away. Is a calibration problems?
Here is a link to the library: github.com/etherkit/Si5351Arduino It can also be found by searching the library manager in the arduino IDE and installing it there.
I assume that your signal generator is accurate to 1hz or so, otherwise your method is no better than using a freq counter that isn't as accurate. I calibrated my freq counter a few years back against a borrowed reference oscillator, it's probably drifted some since then, but when I last calibrated it, it had been off less than about 50hz. That's probably close enough for government work, most people can't detect a zero beat any better than that.
Charlie, your the best. I watch as much from you as I can. Have learned so much. DON'T STOP.
Thanks for the feedback, very much appreciated!
73
Charlie ZL2CTM
Great video Charlie! The calibration worked great for me as described. Ta!
Great to hear Luis! I have another method using beat frequencies which also works well.
Thanks to you and also to Michael :-)
Your explanation was understandable to me, no problem.
I also do not have such a precise frequency counter. The idea of doing this together with my signal generator and the oscilloscope in XY mode is a very good solution :-)
I´ve done it in the same way and the TX and RX signal sounds much better......great!!
Fantastic! Great to hear Bernd.
Charlie
Enjoyed watching ,found this calibration very helpful ,Thanks Charlie.
My pleasure. I'm glad Simon brought it up.
Charlie
a tip: you can watch series on Flixzone. Been using them for watching a lot of movies lately.
@Francis Moshe Yea, I have been using Flixzone} for since november myself :D
good morning Charlie, It appears my original assessment of the signal maybe not sitting in the passband correctly ( due to frequency errors) may have been correct.
The radio is sounding a lot better and all the oscillators will be a lot closer as you have calibrated your board against your signal generator ( which will be calibrated in the factory to some reasonable accuracy ).
I am glad your now seeing the benefits of calibration and the difference in the two approaches to achieve the same outcome. Keep up the excellent video's
best 73's
Simon
Cheers Simon!
73s
Charlie
I'm a beginner so not 100% understanding it all but I'm learning a lot, thank-you.
Happy to hear that!
I see you have an oval speaker for your audio. I've tried all sorts of speakers and I've found that an oval speaker in a simple bass reflex box is easiest for me to understand both SSB and CW. Although when I get serious about reception I use my old headphones. I really enjoy the way you present your projects. I feel smarter after each video you do. I sometimes watch one like this one 2 or 3 times until I fully grok how things work.
W2AEW has a video of using WWV at 5, 10 or 15 MHz as a reference. He tunes off the carrier to zero beat the VFO to the same tone. Using your ear you can get pretty close and then using the S-Meter to watch the beat you can get really close. Worked well for me with two Si5351 cards.
That's interesting. I might have to look into that as an option.
I mitigated the issue by putting a resistor near the xtal to create "TXCO" haha... It is hot but at least it is constant. Great video, keep safe and 73 de 9A3ICE
Nice one Ivica!
Чарли подскажите,как добиться ровного меандра на выходе Si5351?Некоторые артефакты на сигнале присутствуют....Или они не мешают работе смесителя?
I would have thought having a PLL would have compensated for temperature drift. Maybe using this as a signal generator really isn't as great as I thought? I thought it should be much more rock solid - I mean, I guess it is way more rock solid than something like a basic colpitts oscillator without a crystal. At least there is a crystal involved. I wonder how much the drift is over temp
I experimented with my si5351 a bit (I'm only running it at 1.60Mhz) and even with my finger or hot breath on it, it only drifts by 1hz so far. I'd have to experiment more though.
The stability is certainly fine for the CW/SSB rigs I use then in. The lab quality, but certainly good enough.
Hi Charlie got to bottom of it the code had been altered on what should have been displayed on there serial monitor I have mapped the keys with
using UK keyboard and everything now tallies with what's shown on the serial monitor and now get the error and can now correct the freq using
counter will try it later using a scope
thanks again
terry
That's good to hear Terry. Sounds like you are getting on top of it.
Charlie
Bonza mate, I wan't to mod an old Codan
Hi Charlie i have been following this build when I use Jason Mildrums same calibration library when I use the serial monitor interface
I don't get the ref keys to use I don't actually get any I basically get 2 lines one shows actual BFO the other shows same same VFO
on the 12c display has this code been changed ?
regards
terry
Jason did update the library some time ago. I don't have any problems with the calibration sketch. I assume the baud rate is correct. I have had some strange things happen where i had to set the serial monitor at either 2x or 1/2x the sketch baud rate.
@@CharlieMorrisZL2CTM Hi Charlie thanks for reply yes baud rate is correct I will keep working on it great content on your videos
Hi Charlie. I´m from Argentina and im doing my final proyect, an antenna analyzer based on si5351. Im having problems with the resolution. I need two outputs of the si5351. One has to be 1 khz higher than the other. In 50 Mhz and higher , for example if i want 50.001 Mhz my oscilloscope show me 52 o 55 Mhz, is too far away. Is a calibration problems?
Here is a link to the library:
github.com/etherkit/Si5351Arduino
It can also be found by searching the library manager in the arduino IDE and installing it there.
Thanks for that.
Charlie
Very good
Thanks.
I assume that your signal generator is accurate to 1hz or so, otherwise your method is no better than using a freq counter that isn't as accurate.
I calibrated my freq counter a few years back against a borrowed reference oscillator, it's probably drifted some since then, but when I last calibrated it, it had been off less than about 50hz. That's probably close enough for government work, most people can't detect a zero beat any better than that.