Shortwave Crystal Set - BFO!
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- Опубликовано: 8 сен 2024
- That Shortwave Crystal Set can do more than AM. Let's give it a Beat Frequency Oscillator (BFO) and turn it into a direct conversion receiver that can demodulate Code (CW), Single Sideband and even Digital signals.
The fact you are building it out ways the people complaining!! I love to build things they don't always work or work properly but every time I try it's another step on the ladder and it's my ladder and I am the only one using it. Thank you for your time and work.
I give the official approval for the use of a solar cell in this project.
Mike, every video you post, I learn something new, in all my 60 years of being in electronics repair and as a hobbyist, this is the first time I heard of the Franklin Oscillator. Your inspiring me to build and try some of the circuits you cover in videos.
First time for me to actually build an example.
Love your videos, true Amateur Radio asset. Thank You
Cant wait for Part 2 ! Good stuff Mike !
Its coming!
It's not ugly its beautiful because is simple and made of scrap parts
I have NEVER been more excited to see a part 2 video!!! Exciting!!!!!
Interresting. I had forgotten about these diodes and setups. Looking forward for part two.
Great job as always! Thanks for taking on this project, sharing it with us and making it more than a kit that only teaches you how to solder.
Soldering is a whole other learning experience, and especially when you grab the wrong end!
Another great project. This is something I will build, I really like the idea of a crystal SW receiver and a BFO makes it really useful.
Outstanding as usual, Mike.
An awful lot to digest here, but you continue to inspire and educate here.
Please keep up the great work.
73 de AB1DQ.
There are some crazy alternate methods and devices out there, and the tunnel diode represents one of those. How a diode can provde the basis for an oscillator or even an amplifier are black magic circuit areas.
Mike, excellent video and topic, this is exactly what I want to do. Anyone that criticizes your builds, has no clue what this hobby is about. Anyone being critical is either jealous of your knowledge or has nothing better to do but sit on their butts and complain. You sir, have provided us valuable information with the history of radio and and given us vast amounts of knowledge to love this hobby even more. I can't commend you enough for what you have done. You keep on making these videos and I will keep on watching AND Learning. - Mike, KC0IVF
A Q multiplier is used by hams to increase the number of contacts (QSO). The Franklin oscillator was invented by Franklin Roosevelt.
Woke Interpretation - Right on the money Burt!
You’re killing me with the early morning post. I have to go to work!
Mike, I built the first shot wave radio that you done. With a little time, I got a couple of signals in my ear phone, lol. I got it as close as what yours looks like. I am still having antenna problems but slowly working that out. Thanks for all the fun . You explain things so that some like myself as a beginner can understand.
I came expecting memes and was not disappointed!
Thank you always enjoyable
Thankyou so much Mike. QSL card someday would be nice sometime. You are a master just wish I had somebody like you nearer. Once i have my exam out of the way I will see what I can build.
Mike Great video learned a lot enjoyed your videos looking forward to video 2
Very nice !!!!
Very interesting video.
Too ugly AND too neat 🤣. Mike, please do not be perturbed by the construction police. Thanks for sharing 👍.
I have to say in my opinion as a truly completely amateur amateur, everything you make is aesthetically ideal, ugly or not. One man’s poison I guess :)
Okay, that was a lot of information in a short video. Just saying (typing) what my brain was thinking out loud while my coffee is brewing. Thanks.
You cor please everyone but your video are great built ruff n ready i love making stuff outta rubbish all its cost is some time.
Rubbish Radio is Rad.
Your work looks fine. Power it with whatever you please. LOL 😆
I believe there are secrets hidden in the old books and theory of the old circuits. great video , i like very much this project,, remember we are built upon giants, theres way do to some marvels yet, Thanks from Anthony ham radio ve4akf
we have frequently obtained amplification of as much as ten times in current and correspondingly as much as a hundred times in energy. Negative resistance does bring energy from the ambient. It was discussed in the IRE journal 1915 as well. US1141717A
Hi bro. I just wanna say, I love your videos!
my favourite crystal radio is a shortwave set, back in the 1980s I got loads of Soviet propaganda on it, Thankfully not much of that now.
I'd ignore the whiners personally. There are some people that are perpetually unhappy no mater what you do. 😂
The balanced modulator schematic is similar to a ring modulator I built for a friend that played electronic music. I placed the circuit in a Earl grey tea can. I used another can as a signal generator based on a 8038 oscillator i.c The 8038 oscillator oscillator requires 4 or 5 other discreet components and works with a 9 volt battery. Its very simple and provides square triangle and sine outputs at 0- 20,000hz..The chip is no longer made but can be found online. If anyone knows where to find the transformers let me know
A lot of folks ask about wonderful early linear arrays, phase locked Loops, and Mosfets that are becoming unobtanium. I remember working with the 703 IF Amp, The CA-2028, CA3089, 3N128, 40763 and many others that I just have to avoid pushing because it frustrates builders. I try to stick with the through hole parts that are more generic.
I was watching crystal radio videos......before giggling at your solar cell quip directed at the "Sallys", I was wondering if it would be possible to gain enough power by using RF sources to charge a cap that was then used to drive an amplifier or some other powered feature to enhance a crystal radio.
Yes and all you need is a pesky close broadcast station that you want to reject anyway. So maybe we make the TRAP send the bad juice to the power collector which handles the radio power.
Mike, could you do a video on Nyle Steiner’s ‘flame triode’? thanks!
Ugly? I thought beauty was in the eye of the beholder. To me "beauty" is more in terms of its performance than its physical attributes.
Hi Michael, as the BFO will be operating at the same frequency as the xtal set, would it not be possible to use a twin gang capacitor to tune both. My old Marconi CR200 (2-V-2) used to do just that.
This was done in the pre-ww2 Western Electric aircraft receivers and some Navy TRFs as well. It is possible and practical - but demanding on the mechanicals to track a BFO across more than a small band.
On the short wave crystal set would it be possable to build a loop antenna for tge short wave bands
I am excited to try it.
Going to part 2 🏃🚴🏂!
Why not get your power from off the air. 73
First🎉
I was first
Everyone dreams.
@@Capecodham I love your videos too. Maybe there’s something wrong with me?
Excellent
Ignore the bad comments they never learned back in early 70s i had to build stuff out of what you find and military surplus and the joy of making work. 73s WB7QXU
He doesn't "ignore" the negative comments, he just deleted them like a pussy 😁
Such a shame, video was going good until he etarted gibbering about negative resistance..🙄..we dont need all that garbage, just show us how to build the BFO 🤷
Some folks come for the theory, some for the build, some for history, and some just for silly geek entertainment.