Charlie, your the best. I watch as much from you as I can. Have learned so much. DON'T STOP.

@CharlieMorrisZL2CTM

3 жыл бұрын

Thanks for the feedback, very much appreciated! 73 Charlie ZL2CTM

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!!

@CharlieMorrisZL2CTM

6 жыл бұрын

Fantastic! Great to hear Bernd. Charlie

Great video Charlie! The calibration worked great for me as described. Ta!

@CharlieMorrisZL2CTM

3 жыл бұрын

Great to hear Luis! I have another method using beat frequencies which also works well.

Enjoyed watching ,found this calibration very helpful ,Thanks Charlie.

@CharlieMorrisZL2CTM

6 жыл бұрын

My pleasure. I'm glad Simon brought it up. Charlie

@francismoshe5150

3 жыл бұрын

a tip: you can watch series on Flixzone. Been using them for watching a lot of movies lately.

@coltmark2210

3 жыл бұрын

@Francis Moshe Yea, I have been using Flixzone} for since november myself :D

I'm a beginner so not 100% understanding it all but I'm learning a lot, thank-you.

@CharlieMorrisZL2CTM

3 жыл бұрын

Happy to hear that!

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

@CharlieMorrisZL2CTM

6 жыл бұрын

Cheers Simon! 73s Charlie

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

@CharlieMorrisZL2CTM

4 жыл бұрын

Nice one Ivica!

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.

@CharlieMorrisZL2CTM

3 жыл бұрын

That's interesting. I might have to look into that as an option.

Very good

@CharlieMorrisZL2CTM

4 жыл бұрын

Thanks.

Чарли подскажите,как добиться ровного меандра на выходе Si5351?Некоторые артефакты на сигнале присутствуют....Или они не мешают работе смесителя?

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

@CharlieMorrisZL2CTM

3 жыл бұрын

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

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.

@CharlieMorrisZL2CTM

4 жыл бұрын

The stability is certainly fine for the CW/SSB rigs I use then in. The lab quality, but certainly good enough.

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.

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.

@CharlieMorrisZL2CTM

6 жыл бұрын

Thanks for that. Charlie

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?

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

@CharlieMorrisZL2CTM

3 жыл бұрын

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.

@kitcartel9390

3 жыл бұрын

@@CharlieMorrisZL2CTM Hi Charlie thanks for reply yes baud rate is correct I will keep working on it great content on your videos