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  @josealbert45966 күн бұрын

  Years ago, when the humble CB was very popular, they sold crystals for the CB band in electronics stores (possibly today it is more difficult to find). I read something about SSB filters, and bought a good number of crystals 27 MHz and another batch for 27,005 crystals. It seems that there are two types of resonance, one is the crystal acting as a filter and the other is the crystal acting as an oscillator, which are somewhat different, perhaps related to series and parallel resonance. The thing that in its day with an RF generator and an electronic voltmeter with an RF probe made two SSB filters that worked, but the problem was finding the quartz oscillator to create the SSB signal. I didn't insist and abandoned it. I recently bought a nanoVNA, and I found that nanoVNAs are almost amazing, that what once required sophisticated devices, I can measure or analyze with a nanoVNA: I have checked those filters that I made and indeed, they had a very suitable pass band as a filter of SSB. I also bought some ceramic SSB filters for 455 khz (at a more reasonable price than the quartz ones and I have tested them now with the nanoVNA and they are "very effective", today I imagine that they would be difficult to find if not via China. I have some other filters and SSB crystals resulting from scrapping cheap CBs.

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  @danhcong52349 күн бұрын

  Hi Charlie Morris! May I have the first quaestions on this topic. What does SSB mean? It stands for "Single Side Band", doesn't it? And the PD block after IF2. What is it? A mixer? So your Radio Station would be "DOUBLE SUPERHET"? Thanks for your works and attentions!

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  @gasturbine10110 күн бұрын

  Thanks so much for taking the time and trouble to do these videos really informative stuff! 73s Ian G6TVJ

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  @blacksmock44513 күн бұрын

  A common base amplifier for the second stage of your buffer amplifier might be an idea as its low input impedance might be similar to that of the output of your emitter follower stage.

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  @enriquevidal27214 күн бұрын

  hola charlie. felicitaciones por ese trabajo de cristal filtro. te cuento que esa configuración la realice hace unos 30 años atrás aproximadamente. pero en frecuencia de 10 mhz. use en esos años un monitor de estación a válvulas heathkit que tenia incorporado un oscilador de doble tono para ser usado es ssb calibración. me construí un qrp en banda lateral única y lo quería en LSB con cristal filtro . para encontrar el corte ideal no seleccione los cristales de cuarzo, todos fueron al azar, solo que los capacitores fijos entre ellos los remplace por capacitores variables y usando el doble tono encontré los valores correctos para una respuesta decente. fue tan bueno el resultado que cuando salía en 40 metros todos pensaban que era un equipo de fabrica .jajaja. fueron muchas noches de ensayo y error pero el resultado fue espectacular. tu video me hace recordar aquéllos años cuando era un bebe en electrónica pero lo aprendido en general de construir tu propio equipo es impagable. nuevamente felicitaciones y me entretiene mucho tus videos. mil gracias por publicar. atte Enrique Vidal CE5LBM

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  @startobytes28 күн бұрын

  Really hellpfull video. this helps me with my Diploma this year. Would like to see how i could imput this voltage for an esp32 in terms of amplification and such. 73 de OE8GKE

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  @phillipneal8194Ай бұрын

  Hi Charlie, the wspr zl2ctm re78jr 20 encoded symbols shown on the screen demo of genwspr.exe don't match the low or high power symbols in your code on your web site. I generated a symbol table using jtencode in the arduino ide for zl2ctm re78 10 and that matched the LowPWR_WSPR_DATA array in your code.

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  @rambasu7502Ай бұрын

  Out of focus circuit

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  @Jackpot-zp4bxАй бұрын

  I didn't see the main volume control on your schematic. From the photos I can see a cable with either 2 or 3 wires leading to a pot. What value pot did you use ? Did you use all 3 terminals on that pot ? Thanks.

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  @F_Tim1961Ай бұрын

  This spiel covers a heat tabbed SMD mosfet that is a contender to replace the BS 170 in a lot of PP circuits and may indeed serve as cheap subs for the expensive LD mosfets ,VHF rated, which you used. They are likely hard to find on Ebay but are a part that can be found on Mouser and Digikey. The Tab on these is voltage hot so the copper pads have to be kept isolated when in service. -The PA mod accommodates two FDT86256 Mosfets and provides some heatsink PCB space with footprints matching the motherboard BS170 for easy installation. The FDT86256 offers several advantages over the BS170. The most notable advantage is its higher breakdown voltage (Vds), which stands at an impressive 150V, in contrast to the BS170's 60V. Another significant benefit of the FDT86256 is its ability to handle higher power levels, with a rating of 10 watts, compared to the BS170's 800 milliwatts. However, it's worth noting a drawback of the FDT86256 when compared to the BS170, and that's its higher input capacitance (Ciss), which measures 55 picofarads (pf). This higher capacitance can potentially impact its performance at higher frequencies. However, in a Class D configuration, it performs comparably to a pair of BS170s. Typically, the Ciss capacitance of a BS170 is around 24pf. When used in parallel pairs, the total capacitance reaches 48pf, which is not significantly different from that of a single FDT86256. This encouraged me to consider the FDT86256 as a replacement for a BS170 pair. End of snip . TEF (Relates to use of this Mos device in an RF PPull circuit. ). TheFDT is of the order of $1.50 US each from the normal supply houses like MOuser (and the high courier bill that goes with it).

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  @mariaviklund4546Ай бұрын

  I would love to build an AM Air band receiver around an Arduino and the Si5351, but i just don't understand the analogue part of the receiver. Something like the Signal Corp R-532 or 535.

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  @RadioMaker3602 ай бұрын

  Great

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  @kensmith56942 ай бұрын

  A quick note about the resistor at TIP31C B-C. If you do a bootstrap by splitting that resistor into two in series and feeding the mid point from your amplifier's output, you can get a better positive swing. I like the design. I would have used TIP35 and TIP36 for my output but only because I have some.

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  @lanceneame2 ай бұрын

  Hi Charlie, have you, or ever thought of building an updated version of the Tucker Tin ssb transmitter with commonly available parts? Anyway, keep up the excellent work! Best regards, Lance ZL3LAD.

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  @cn8ft2 ай бұрын

  Blabla blabla blabla !!!!!!!!!!!

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  @jorgeomar87952 ай бұрын

  *MUCHOS CIRCUITOS,ESQUEMAS,PLANOS,Y EXPLICACIONES,PERO EN 30 MINUTOS DE VIDEO,NO FUISTE CAPAZ DE HACERNOS ESCUCHAR COMO FUNCIONA?????* *INEPTO!!!!*

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  @jorgeomar87952 ай бұрын

  E

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  @alejandrotavolini10442 ай бұрын

  Excelente !!!!LW8DNV

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  @JohnKennedy-yg3ks2 ай бұрын

  Charlie, can you explain the volume control shown on your breadboard, it's not shown on the schematic or video?

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  @Dazzwidd2 ай бұрын

  If you just wanted to listen to the station up the road you could have just done it with a few transistors and an AF amplifier 😅 Nup not good enough says Charlie... but I won't worry about an AGC hahaha, might as well set up an AGC now anyway 😂

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  @CharlieMorrisZL2CTM2 ай бұрын

  It was a scratch that I wanted to itch. Yes probably an overkill, but fun nonetheless.

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  @Dazzwidd2 ай бұрын

  @@CharlieMorrisZL2CTM I want to try playing around with a "crystal set"... okay I'll call it a detector 😆 But the idea is to use a stage of RF amplification ahead of it. Then of course bias the detector a little. Then play with an AF amp using AGC that has a LOT of open loop gain... might as well make a single conversion superheterodyne radio. I'm with you Charlie, you're doing great 😆

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  @kensmith56942 ай бұрын

  @@Dazzwidd For "extra credit" you can make a reflex amplifier that does the RF and the audio. There is a bit of a trick. You make the polarity of the audio such that more RF into your detector makes less current in the amplifier transistor. This gives it some AGC without even trying.

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  @Dazzwidd2 ай бұрын

  @@kensmith5694 yeah, you could do that. Being serious here, I would make an AGC arrangement that provides you with an S meter indication if I was doing what Charlie is. Might be better to gain control the intermediate frequency stages rather than the audio and maybe have a little AGC on the front end 🤔

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  @kensmith56942 ай бұрын

  @@Dazzwidd Normally, AGC is done in the IF stages. You want to take some gain before it just to be sure you are above the device noise. The AGC signal is usually a low pass filtered version of the detected output. The IF stages are run with emitter resistors bypassed so that the gain depends on "little re". This lets you have a fair range of gains. A meter on the AGC voltage works as a signal meter. With a bit of cleverness, you can make it work in dB.

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  @mariaviklund45462 ай бұрын

  Wow, this is amazing. As someone previously said, this is something i have been looking for. Awesome job Sir.

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  @CharlieMorrisZL2CTM2 ай бұрын

  Excellent. I'm really pleased it was useful.

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  @propagating-radio2 ай бұрын

  I built this just today. Works great! Very interested to follow along with this series. Thanks Charlie.

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  @CharlieMorrisZL2CTM2 ай бұрын

  Excellent. I'm pleased it was useful.

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  @SpinStar19562 ай бұрын

  Hi Charlie! The only suggestion I would have, is to try different semis. While the 510 is used in many RF applications, I’ve heard some people having better efficiencies with RF transistors. In fact, some great results were had (even over MOSFETS) by using RF bipolars such as recovered CB final transistors such as a 2N1969. This (to me) would seem more likely to be the area whereby the efficiency would most likely be compromised. The only argument against that is, if-so, one would think you’d see the inefficiency manifest as heating in the device. Anyway, even though you may have to ‘buck-up’ the input driver, I’d still give the RF bipolar a try. Thanks very much for your excellent explanations, analysis and demonstration. 73… 😊

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  @CharlieMorrisZL2CTM2 ай бұрын

  Thank you very much for taking the time to comment. I'll add the 2N1969 to the list of devices to look into. 73.

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  @TheEmbeddedHobbyist2 ай бұрын

  I do love the engineers view on design, we will calculate what value we need then just pick a close preferred value. before PC's we would work out the affects of tolerances on the components, taking the min and max values to calculate what the tolerance spread would do in production and writing the test specification around it. PC's and lt-spice made that a much easer job. 🙂

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  @CharlieMorrisZL2CTM2 ай бұрын

  I know it's bit of a shortcut, but it works well for me for the types of circuits I play around with.

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  @TheEmbeddedHobbyist2 ай бұрын

  @@CharlieMorrisZL2CTM it's not a short cut it's a design decision. In the same way we try to use a lot of the same values for components, reducing the amount of different parts in the BOM reduced costs. If you don't have any tolerances in your specification then you going to need exactly the right value which certainly puts the costs up.

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  @kensmith56942 ай бұрын

  BTW: You can use up to 3 .step commands in LTSpice. This way you can plug in all combinations of min and max for 3 components to see the spread of results. If you want more there is a trick where you step a "test number" and then make the resistor values with expressions.

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  @TheEmbeddedHobbyist2 ай бұрын

  @@kensmith5694 can you remember when you ran spice off a floppy on a 367. When I was doing it all by hand the only other option was on the mico-vax terminal. I don't think we had the spice program on the vax.

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  @kensmith56942 ай бұрын

  @@TheEmbeddedHobbyist My first PC was an 8088 based DOS box with two floppies. I am leaving out the ZX80 as a "PC" I still own my slide rule and can remember how to use it. The first simulation software I encountered range on an IBM360. Spice has made a lot of stuff easier. At one point I downloaded the source code for it and worked on fixing a few bugs. For a correct "deck" it was ok but some syntax errors would cause it to segfault without telling you what line caused it. My changes may even appear in versions today. I just made the uninitialized pointer lead to a syntax error. At least you would then know what line did it.

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  @sergeyka77992 ай бұрын

  Hello, which machine is the mixer from?

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  @CharlieMorrisZL2CTM2 ай бұрын

  It's a standard 7dBm DBM device. An SBL-1.

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  @ingussilins63302 ай бұрын

  Good result and circuit board :)

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  @CharlieMorrisZL2CTM2 ай бұрын

  Thanks. I think it works well.

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  @Kd9bpy2 ай бұрын

  Missed watching Charlie....took a break from things for some life stuff.....kicking off my resurgence into radio this weekend at Hamvention! Hopefully i will add many things to my junk box for future trials into the homebrew world.

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  @CharlieMorrisZL2CTM2 ай бұрын

  That sounds great. I'd like to go there someday. I'd have to take a second empty suitcase if I did!

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  @101blog2 ай бұрын

  Really enjoyed the run through ..It sounded good too...Keep it up Charlie!

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  @CharlieMorrisZL2CTM2 ай бұрын

  Thanks. Just listening to it now as I work. Very happy.

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  @kr1s3142 ай бұрын

  How did you decide on the inductance of the coil in the collector load? Why is a coil beter than a resonance tank or maybe a simple resistor? Also, I think your attempt to match the impedance of the filter is incorrect - if the input filter impedance is 910 ohm, this should be the output impedance of the common emitter amplifier stage. Since for CE config it's the collector load, your collector resistor should be ~910 ohm or equivalent. Shunting with a resistor makes it worse, since now you have 910 ohm in parallel with ~25uH of the coil which is roughly 1600 ohm at 10.7MHz.

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  @CharlieMorrisZL2CTM2 ай бұрын

  Yes, I took a few shortcuts on this particular build. In the past I have made the effort to better impedance match crystal filters with the output/input impedance of the IF amps. While not ideal, it's working well for this particular radio.

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  @kr1s3142 ай бұрын

  ​@CharlieMorrisZL2CTM Of course, working radio >> perfect theoretical design. On the other hand, this could be a starting point to pretty interesting experiments on fine tuning and squeezing the max performance out of it. If you have a signal generator and basic measurement tools like a decent audio interface and software, you could do a couple of follow-up videos on those. Would be interesting to see the effect of impedance matching on the distortion introduced by the filter stage. Cheers!

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  @M0NTVHomebrewing2 ай бұрын

  I love the world according to Charlie! Brilliant job as always. I'm certainly going to play around with an infinite impedance detector and maybe even a Franklin oscillator (if I can prize the Si5351 from my hands!). So good to have you back on KZread. 73, Nick M0NTV

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  @101blog2 ай бұрын

  I was thinking of a similar design with the Si5351,less organic but probably more repeatable

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  @CharlieMorrisZL2CTM2 ай бұрын

  Cheers Nick. It's simple, but works well for my purposes.

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  @BalticLab2 ай бұрын

  Great video, as always!

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  @CharlieMorrisZL2CTM2 ай бұрын

  Thanks for the feedback. Just me chatting away.

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  @stephenmorton80172 ай бұрын

  a masterpiece of discrete component design. if it isn't, i don't know what is.

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  @CharlieMorrisZL2CTM2 ай бұрын

  I wouldn't say that Stephen. Each to their own. The method works well for the types of circuits I build.

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  @SawdustSoftwareSiliconChippy2 ай бұрын

  @@CharlieMorrisZL2CTM Maybe not a masterpiece. However, it's designed beautify, and beautify built! And good enough to be (picture) framed. Perhaps you should change your channel name to Electronic Arts (EA™) 😆

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  @skylabby2 ай бұрын

  Thanks for the update..enjoyed learning as always 73s

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  @skylabby2 ай бұрын

  Do update your blog with actual photos as you did in the pass.

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  @CharlieMorrisZL2CTM2 ай бұрын

  I'll make a note and put some up later.

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  @williamrmeara21622 ай бұрын

  Really nice Charlie. It sounds great. I like your constuction technique. I too make a lot of use of solder wick. And I like copper clad on wood. More room is better than not enough room. And there is a benefit in keeping all the circuitry visible. 73 and thanks, Bill N2CQR

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  @CharlieMorrisZL2CTM2 ай бұрын

  Thanks Bill. It's just a simple little radio, but that was the aim.

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  @tautech81962 ай бұрын

  Riveting as always Charlie. Which antenna did you end up using ? You were intending to try just a piece of wire across the shack.

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  @CharlieMorrisZL2CTM2 ай бұрын

  I strung up a long wire in the roof. Works well.

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  @SawdustSoftwareSiliconChippy2 ай бұрын

  Another fantastic, scratch built, radio. I must have missed it, but I'm intrigued about the variable, vernier-drive tuning capacitor. Where did you get that from. Such things are now almost imposable to find! 73 de VK6AWK

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  @CharlieMorrisZL2CTM2 ай бұрын

  The capacitor came out of an old boat anchor radio that was as parts only. I scored a crystal filter out of that too, which was good,

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  @SawdustSoftwareSiliconChippy2 ай бұрын

  @@CharlieMorrisZL2CTM Those air_gap variable capacitors, especially the vernier drive models, are impressive. More so, when considering the technology (manufacturing) of the time, compared to today's CNC laser cut, and robotic mass production, can't make equal quality for the price today. And I can't argue with having the circuit naked. But perhaps a clear Polycarbonate cover to deter dust?

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  @user-bq7uk4lr8e2 ай бұрын

  Very helpful and enjoyable. ZL1GH

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  @CharlieMorrisZL2CTM2 ай бұрын

  Glad it was helpful. Again, not a tutorial, just a video diary.

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  @4youian2 ай бұрын

  I second everyone's comments here Charlie. Thank you, 73, VK7IAN

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  @CharlieMorrisZL2CTM2 ай бұрын

  My pleasure. I'm pleased it was enjoyable.

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  @Dihydrousoxide2 ай бұрын

  A beautiful looking and sounding radio. Thank you for taking us through the design process. 73, ZL1SHP

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  @CharlieMorrisZL2CTM2 ай бұрын

  Thanks for the feedback, much appreciated. I'm pleased it was useful.

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  @jacobboth19142 ай бұрын

  Looks good. Sounds good. Enjoy ! I did. 73 PE1LLA

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  @CharlieMorrisZL2CTM2 ай бұрын

  Cheers. I'm very happy with how it turned out.

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  @tonychristoph10632 ай бұрын

  I really like the way you make your circuits. They are very beautifuls and make me want to do the same thing. Also it works well and the sound is amazing, sorry for my basic english !

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  @CharlieMorrisZL2CTM2 ай бұрын

  Go for it Tony!

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  @tonychristoph10632 ай бұрын

  @@CharlieMorrisZL2CTM yes it is planned I am retiring in september I will have some free time

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  @davidjh72 ай бұрын

  Great job and sounds great. It's really good to see you make another series of videos. Always enjoy your content.

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  @CharlieMorrisZL2CTM2 ай бұрын

  Thanks David. I'll see what the next build will be. I'm conscious that my approach to things is not textbook, which opens myself up to criticism. To me these are just a video diary of what I have been playing with. All good fun.

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  @davidjh72 ай бұрын

  @@CharlieMorrisZL2CTM I am an EE, and frankly, I think your approach, and designs, and methods follow a very good process, and you use most of the rules for transistor biasing and design that I learned. in school, and used through the years. Your results speak for themselves. You do great work, and follow a consistent, well thought out design process that yields good results. Kudos! The only thing that might be something else to add to your design toolbox for transistor biasing is a little stability analysis. I can't think of anything else you are really missing in the process.

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  @eunaoacredito39112 ай бұрын

  I would be amazed to see this project receive shortwave and demodulate SSB.

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  @CharlieMorrisZL2CTM2 ай бұрын

  Check out the other videos as there are several SSB rigs. Today was a simple AM radio to keep me company.

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  @mbunds2 ай бұрын

  It has become my sole task to learn to write and draw as neatly as you do.

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  @CharlieMorrisZL2CTM2 ай бұрын

  Still bit of a scribble. I enjoy the pencil.

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  @M0NTVHomebrewing2 ай бұрын

  That is looking great and sounding terrific Charlie. Well done! 73, Nick

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  @CharlieMorrisZL2CTM2 ай бұрын

  Cheers Nick. I finished it this afternoon. I'll put up another video shortly looking at the AF amp and the detector.

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  @jacobboth14382 ай бұрын

  I would welcome extra rf-gain. For years we, in the Netherlands, have been deprived of the big broadcast transmitters. What's left is an ever changing offer of LPAM stations. (between 1 and 100 Watt).This requiers close proximity and/or a very good radio. Absolutely love your radio. Scrambling for parts now. PE1LLA.

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  @CharlieMorrisZL2CTM2 ай бұрын

  Yes I am lucky here in that the transmitter is not too far away. I'll have to keep experimenting.

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  @RadioMaker3602 ай бұрын

  Great

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  @CharlieMorrisZL2CTM2 ай бұрын

  Cheers. It works for me.

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  @williamrmeara21622 ай бұрын

  Beautiful work Charlie. I'm guessing that that variable cap has the rotating vanes (and thus the panel contol) grounded, with the stator vanes going to the circuit. That may be why you can touch it with no frequency shift. FB on NOT having shielding around the VFO. Too often dogma and lore has us putting unnecessary metal boxes around this stage. 73 Bill N2CQR

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  @CharlieMorrisZL2CTM2 ай бұрын

  Thanks Bill. Yes, the rotating vanes are grounded, which adds to the stability. As you know, I prefer not to have enclosures arounds the circuits as I enjoy looking at them and thinking about what each component is doing. 73.

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  @tonychristoph10632 ай бұрын

  good work !

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  @CharlieMorrisZL2CTM2 ай бұрын

  It certainly works well. Now to look at the AF amp. I suspect I'll go with the current configuration, but relook at the biasing etc.

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  @Radiotreehut2 ай бұрын

  Anither great radio..the very neat and artistic work...the oscillator capacitor is a piece of art with that gear arrangements..radiofun242 also made experiment once by varrying gains in different sections ..in rf and if...most am radio have tuned fromt end and 1970 80 radios advertised turned rf stage..you completely skipped tuning the rf ...the second capacitor of gang capacitor could be used for rf front end tank circuit...i saw 3 trf stages in a russian ishim radio...the radio you built sound amazing without any of those...i wander if you may need turned front end for weak am stations and dxing....you vedios helps us a lot and its always fun to watch and listen tou doing these stuff...

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  @CharlieMorrisZL2CTM2 ай бұрын

  Yes, that could be an option. As I'm really only interested in one station it wasn't a real need. Thanks for the feedback.