Would not compile....faults. I double checked it from what is blurry on the screen, looks exact. Is there a copy of this code for download so I can test my si5351 module? What should I be seeing pk-pk voltage OUTPUT?
Interesting work I was thinking of modifying my old 2m rig using the Si5351B as the FM generator, and I liked the display and controller. When you get some more boards (the board shown is this video) I would like one thanks. Paul, G6SAA
Hi Paul, thank you for your comment. The si5351B breakout board with FM modulation capabilities is now fully designed, tested, and ready for manufacture. However, if I'm honest, I'm not in a position to distribute these boards at this time. The board shown in the video is a prototype, and I have since refined the design. As a radio electronics hobbyist and enthusiast, I have designed the board as an open-source project. Given the interest in this board, I believe it would be a great seller. With that in mind, I have reached out to several manufacturers, including Adafruit, to explore manufacturing and distribution options so people can get hold of them for their projects. Regarding the controller board (Band Surfer MK2), I have been developing it for quite some time and am nearly ready to move on to the next step of getting it into the public domain. Again, I am exploring manufacturing avenues. Thank you again for your comment, and suggestions are always welcome. I am in the middle of making more videos about these projects, which will be available very soon. regards John M0XFX
Hi Robert, I like the way you are thinking however; the I am using a type B si5351 with a built in VCO to modulate the FM. The the deviation level is set via the I2C. I am currently make part 2 which going through how it works in more detail including schematics and code.
@@M0XFXUK Ah, ok. Thanks for answer. I'm thinking about using a varicap diode to modulate reference oscillator (with A version), but it will probably be difficult to control the deviation when the carrier frequency changes... And i dont know if PLL is fast enough for 3kHz Fmod.
@@robertdec3713 If I am honest, I think it would be a bad idea to mess with the reference oscillator frequency as the frequency stability would be all over the place. Using the type B IC I can modulate up to 10KHz deviation without any issues. I am making part 2 which should be out tomorrow.
Great. I've been looking at tacking on a TCXO to the original but it's a pain. The FM is a bonus, I'm guessing you're using the next version up with the analogue pin. I didn't know a TXCO was available in such a tiny package.
Hi Leonard and thank you for your comment. Yes we are planning to make them available, we are trying to get them manufactured in China. We can supply one off boards that we assemble however; they are quite expensive.
@@M0XFXUK Well I'm getting too old (dexterity and vision) to do much surface mount stuff anymore so assembled would be the only way for me to go. I'll bet however there will also be many others that will be interested in assembled units for the increased stability of the TXCO. Please keep us informed through your future videos.
Hi mate, I am sorry to hear that you are having issues with the ads from our channel. We have the channel monetised to try and recoup some of the outlay of making the content. If we switch it off RU-vid still runs ads anyway. I will take a look into how I can correct this. Thank you for your message.
Enjoyed your video. Thanks. My 707 is stuck on powerup. How do I do a factory reset? I pressed the button on the rear of the front panel but nothing happened.
Haha, I'm sorry, you are correct. This has been a long-running joke with some of my viewers, playing on words involving John Hurt, the famous actor, and Heinrich Hertz, the physicist known for his work with electromagnetic waves. It all started with Michael Faraday and the unit of capacitance, the Farad, which is commonly referred to in plural as Farads. For example, people often say "10 microfarads." Should it be Farad or Farads? Hertz or Hertzs? I realise this can be confusing, so I will stop doing it. Thank you for pointing it out.
Apologies for the late reply, No this unit uses the Si 5351 which has a range of up to 200Mhz however people have been using the harmonics to get into the GHz range. This does work but it can suffer frequency instability as you are so far away from the base clock frequency. I hope this is of help. Regards John
John, great series and I would like very much to have your PCB as soon as you have them available again. Do you have any Idea when they may be back in stock. I know that you asked for an email, however I didn't get a response to my email as of this time, so I'm trying this route.
John, I have gotten a lot from the series, thank you for the great descriptions and sketches I sent an email requesting information on your PCB availability, and have not seen a reply, so I'm trying here. I would like one or two when they are available.
Hi apologies I have been busy with work commitments of late. the PCB should be available again soon and I have made some improvements. Keep an eye on the channel. great to hear that you are enjoying the content.
Hi Paul apologies I have been busy with work commitments of late. No the squelch works by the micro controller comparing the signal level with the squelch level and switching on a transistor which grounds out the squelch circuit in the transceiver.
Impressive work going on here. Kindly do you have a documentation of this project with connection diagrams for the test instruments ? Especially how/where you test the signal to noise ratio. Thank you
Hi apologies I have been busy with work commitments of late. With regards to your question, to be honest signal to noise isn't really the best way to test the performance of the clock generator. I had noticed the the original LO in the radio had quite a bit of phase noise indeed you can see it on the oscilloscope. If you wanted to test signal to noise I find using SINAD measurement is good way doing this especially if you are using FM. To do this you need to inject a 1 KHz modulated RF signal into the antenna socket tune the radio to the same frequency. Connect a SINAD meter to the Ext speaker socket and reduce the RF signal level until you get into the noise. The SINAD is the ratio of noise to the RF signal level.
Hi apologies I have been busy with work commitments of late. With regards to your question: I am used the ESP32 S3 however; I guess it would work with esp32 Devkit v.3 but you may have to may have to change to GPIOs the code to suit that board. I hope this is of help.
Hi apologies I have been busy with work commitments of late. To be honest I have developed a new Si5351 breakout board with a 2ppm TXCO which has improved the frequency stability and I have also added an FM modulation feature to the new breakout board. With regards to GPS steered frequency stability is not something I have given much thought to. I believe that he type C variant of the si5351 can be controlled by a variety of reference frequencies which would be interesting to see how it performs with GPS locked standard but is not something I have had the time to play with. Thank you for the comment as it's good food for thought. regards John M0XFX
Hi apologies I have been busy with work commitments of late. regarding your question, Yes I don't see why it shouldn't work however depending what features you use you may need to reassign the GPIO's to suit. Thank you for your comment.
Hi apologies I have been busy with work commitments of late. regarding your question, I am sorry but I don't remember the values or the voltages of the capacitors. I would say it would be a good idea to make sure that you using the same voltages as the caps that you replace as higher voltage caps tend to higher ESR characteristics.
Hi apologies I have been busy with work commitments of late. Jose it's great to hear from you my friend and yes it's been a long time. I hope all is well with you and the family. Yes I have been fixing radio again and playing with Arduino as you suggested all those years ago. It's been difficult for me to keep in the radio repair screen as I have been working project across Europe and not had the chance to be in the workshop. Great to hear that you are still at it, Very Best Regards John M0XFX
Yep I used to have one too, they are a great performer and I really enjoyed operating it. To be honest I think that we are only just starting to see this problem with the 920 as I agree they have been a reliable radio. Since making the video I have had quite a number of people contacting me with the same issue. It's a relatively easy fix so let's hope we can keep these radios going for years to come. Thank you for your comment
Hi apologies I have been busy with work commitments of late. Thank you for the comment. It's not designed as a signal generator per say but more of a local oscillator and if I am honest it doesn't really fall into the category of DDS regarding RF signal side of things as the clock generator is a PLL synthesised system and not a digital to analogue convertor. It does however; have DDS function from the MCU generating audio tones for CTCSS etc. Again if I am honest I have moved on from this project and I have been developing a more powerful version called the Band Surfer base around the Si5351B IC using the ESP32 S3.
Hi Gene, That's a great offer, as I assume there are still a lot of hard-to-find parts in there. May I ask what the problem is with the main board? Regards, John M0XFX
Hi Ryan, I'm sorry to hear that you're experiencing problems with your FT-1000MP. I haven't encountered the specific fault you're describing; however, when you see a flashing frequency display, it's usually related to the PLL not locking up or the local oscillator not being present. These radios are quite complex, so it's difficult to pinpoint the issue without having it on test gear. May I ask where you're based?
Hi Chris, it's always great to hear from you. I'm thrilled that you enjoyed the video! It was a bit of a rush job on my end, as I've been quite busy lately.
Hello John. Very interesting video, and extremely helpful in other ways. I recently received the Japanese version of the TS-570S that is set to 50 watts of total output power. I kind ham in Japan sent me detailed information on how to perform changes to make it a USA standard TS-570S. One jumper added at R30 and one 1K SMT resistor removed on the board. The board in this note is the board holding the memory battery. Now my challenge is the proper set up using the programming plug at the rear, and entering the service mode to set ALC and idling current for the rig. The service manual is not clear or the terminology is a bit vague. I'm happy I found your channel, for sure! David Fleming NS8S
It's basically an IFR FM/AM-1200S with the signal generator removed and the attenuator replaced with a tuning encoder. There also seems to be one of the cards missing compared to the original service monitor - I think that slot was the function generator PCB, which would make sense since this unit has no generate capability and hence no need for a modulation source.
Thank you for your intriguing comment. It's fascinating to note that the unit seems to be an adaptation of the general 1200S test set. Personally, I've never come across one of these before. Our search for a replacement crystal filter or card is ongoing however, it's heartening to know that despite its issue with USB, the owner still finds utility in it. Once again, thank you for sharing your insights.
@@M0XFXUK Looking a bit closer, I think there are some other changes too - I don't recognize that board with the xtal filters on it you were looking at - IIRC the equivalent PCBA was called "10.7MHz Generate/Receive Assembly" and although it did have some filters on it they were all the smaller HC-18 style and not those larger ones. From the looks of things, the control section, frequency synthesizer and spectrum analyzer are identical though. There was also a Duplex module that was mostly used for testing cellphones and trunked radio, and I would assume that's not present in this unit either.
Hi Kevin, $50 is indeed a great price if you can get it working. However, I regret to inform you that I'm based in the UK, and I don't think it's feasible to ship the radio all the way from Ohio, USA. You mentioned that it's not working, but could you provide details about the fault?
@@M0XFXUK it has been repaired it's a beautiful radio the night watch not working I don't know why cobra build stuff like that when you can't repair it 73 is guys w8dmx kevin
@@kevinstevenson5591 Be cautious, as videos can sometimes be misleading. If you suspect it's not transmitting and it's a Cobra 200 GTL DX, a common issue could be the RF driver transistor RD16HHF1; however, it could be any number of things. Frankly, if you lack experience and proper testing equipment, I strongly advise taking the unit to a repair shop. Radios like this are quite easy to damage as you can see from this series of videos.
I see that you are using the standard 25MHz reference oscillator, for the Si5351A. There is research that shows that, for radio frequency uses, a 27MHz reference provides access to some tuning frequencies that the 25MHz does not. (My use is not for radios, so I have not kept the source references for this use. However, this information can be found on the web. I do recall that it was proven in a white paper, which included the requisite calculations.) Quoting from my User Manual, from the Si5153A project that I am developing... "The Si5351A’s maximum output frequency is 200MHz. It may be varied freely by manipulating its internal mathematical multipliers and dividers. Some consideration is needed for the impact that these multipliers and dividers contribute to jitter, in the selection of the various math settings. The manufacturer, Skyworks, provides its ClockBuilder software, for ease in selecting the best settings to create the least amount of jitter. [Link pending] The chip requires an external reference oscillator. The current recommendation is either 25MHz, or 27Mhz. Because of calculation constraints, 27MHz enables the selection of some very particular RF frequencies that 25MHz does not. The current frequency recommendation may be changing to 26MHz. Additional investigations into other source frequencies are being made by individuals. Of interest is the possibility of using the precision of the 1PPS available by the use of a GPS receiver to create a standard 10MHz source." Though I am sharing this information, here, the exact text is under copyright and may not be redistributed without prior writing authorization. I am no expert on the 27MHz reference crystal subject, but I hope the information points someone in the right direction to attain their tuning goals. I apologize that this is not well written. It is extremely late and I am very weary. Cheers.
