You put much work into this episode! So many diagrams, and photos I"ve never seen. This is a much neglected topic that you are bringing back to life. Thanks!!!!
@@MIKROWAVE1 A very steep learning curve at the time. I learned recently that radio communication from aircraft to ground gun batteries began in the first World War. Remarkable.
Again, you are spoiling us Mike by treating us with another exceedingly interesting series. After looking at the circuits, I thought, surely he is not going to build one. But, of course, you did! The Jerk keying idea was brilliant. Quite ironic that hams managed to demonstrate the potential of these commercially "worthless" higher frequencies. A real landmark in ham radio and radiocommunication history in general.
Those early all in one chips were a real boost for experimenters, even if they were not really successful in the commercial world beyond low end products and novelties, toys and such.
@@MIKROWAVE1 yes at all. I have a chinesse am/fm receiver with a zn414 in mw am and a supere gen in vhf fm. A very from scratch design for a factor y radio model
I've made one or two of those beginner style one-transistor FM transmitters with varicap modulation in the past, this video sparked my interest in building another one, but frequency-modulate it using a separate coil, which is rf-shunted by a pre-biased, audio signal driven jfet or mosfet. Wondering if it can be made linear at all.
Great presentation, and I especially appreciate the level of effort here. About the chirp though, back in the 60s when I was very active I generally found chirp on a DX station made it a little easier to pull them out of the noise and in particular any QRM. For this test I doubt the latter was a problem back then, but I'm not at all certain given how broad the spectrum from the relatively nearby spark transmitters would have been and what I would expect the high harmonic levels to be. So some chirp might actually have had some advantage for their purpose.
@@MIKROWAVE1 I remember the Soviet jammers that sounded like airplanes and the over-the-horizon radar woodpeckers, but not the buzzsaws. Do I take it that it refers to Eastern block amateurs with less-than-effective supply filtering? :)
Hi Michael! Excellent video per usual. I have a question - when you tune +10 kHz, is that a receiver or lab frequency synthesizer you are tuning. The equipment looks familiar to me, but I can't dredge it up from the lumberyard... 73, Rand N7RLG
The relay in the original 1920 circuit simultaneously keys the power amplifier, so it's not transmitting RF when not keyed (the oscillator is indeed free running though)
Ah the pure engineer. When you read the history, you see tinkerers, engineers and physicists and the financial backers and small and powerhouse manufacturers all using and abusing or being run over by the patent and legal systems worldwide.
@@MIKROWAVE1 Thank you for the response. I will accept what you say. I would however incline towards calling even physicists and tinkers engineers because they were doing engineering.
Tks fer your absolutely amazing presentation. 7351. So many giants.
You put much work into this episode! So many diagrams, and photos I"ve never seen. This is a much neglected topic that you are bringing back to life. Thanks!!!!
The radio history is so compressed into so few years when triodes hit the bench.
The beginning of radio is fascinating history, thanks
It is fun to research this stuff.
I marvel at the time and effort you put into these carefully crafted videos. I appreciate them and the information and history so well conveyed.
It is shocking to think of how much was done so fast, and with so little to work with in terms of hardware.
@@MIKROWAVE1 A very steep learning curve at the time. I learned recently that radio communication from aircraft to ground gun batteries began in the first World War. Remarkable.
You knocked this one out of the park, Mike! Outstanding content and perfect presentation! A sincere thank you for this and all your other videos!!!
That's an understatement! I think this is the best video on youtube!!! wow!
Wow thanks for watching and the feedback!
Again, you are spoiling us Mike by treating us with another exceedingly interesting series. After looking at the circuits, I thought, surely he is not going to build one. But, of course, you did! The Jerk keying idea was brilliant. Quite ironic that hams managed to demonstrate the potential of these commercially "worthless" higher frequencies. A real landmark in ham radio and radiocommunication history in general.
Yes worthless. Lately with 5G, the value of these radio waves are really becoming known!
I really enjoy your videos. Thank you for doing them. N4KH
Nice masterclass Mike!
This arrangement of FI stage remember me the zn414 am radio receiver IC. Best wishes from Argentina
Those early all in one chips were a real boost for experimenters, even if they were not really successful in the commercial world beyond low end products and novelties, toys and such.
@@MIKROWAVE1 yes at all. I have a chinesse am/fm receiver with a zn414 in mw am and a supere gen in vhf fm. A very from scratch design for a factor y radio model
Very good Performance Video🐒😯👍good Tube Oszillatoren.regards Matthias.
Ich war erstaunt, als ich zum ersten Mal Meissners Frühwerk im Drahtlosbereich mit dem lieben valve entdeckte.
@@MIKROWAVE1 toll,von dem Oszillator gibt es aus der Physik den Uraufbau mit Triode,Hf Transistor oder valveaehnlich als FET Version,genial👍💖🐒😂👲⛄
I've made one or two of those beginner style one-transistor FM transmitters with varicap modulation in the past, this video sparked my interest in building another one, but frequency-modulate it using a separate coil, which is rf-shunted by a pre-biased, audio signal driven jfet or mosfet. Wondering if it can be made linear at all.
That is stinkin good thinkin! Sounds like a bench project!
Hi Michael that was a really interesting one. Could do with some more like that please. David GM4GLG
Lets see how it does on the air in the next one.
Great presentation, and I especially appreciate the level of effort here. About the chirp though, back in the 60s when I was very active I generally found chirp on a DX station made it a little easier to pull them out of the noise and in particular any QRM. For this test I doubt the latter was a problem back then, but I'm not at all certain given how broad the spectrum from the relatively nearby spark transmitters would have been and what I would expect the high harmonic levels to be. So some chirp might actually have had some advantage for their purpose.
True! Do you remember the Bulgarian Buzzsaws?
@@MIKROWAVE1 I remember the Soviet jammers that sounded like airplanes and the over-the-horizon radar woodpeckers, but not the buzzsaws. Do I take it that it refers to Eastern block amateurs with less-than-effective supply filtering? :)
Thank you vere muth. 73 !
экскурс в историю
Hi Michael! Excellent video per usual. I have a question - when you tune +10 kHz, is that a receiver or lab frequency synthesizer you are tuning. The equipment looks familiar to me, but I can't dredge it up from the lumberyard... 73, Rand N7RLG
That is a Watlins Johnson 8711 Receiver, a late 80's "digital tuning 3rd IF sampling" receiver. 1st Gen SDR.
@@MIKROWAVE1 Thanks - very cool :)
Hi, this is unrelated comment: you have a most very very nice W-J HF receiver... voila! I had to say it.
Hey, thanks!
Sorry, I've missed something - when you use "jerk keying" on 1.310 MHz, aren't you causing QRM to others on 1.300?
The relay in the original 1920 circuit simultaneously keys the power amplifier, so it's not transmitting RF when not keyed (the oscillator is indeed free running though)
Well that was purely into a dummy load. The 160M (1.8 MHz) transmitter has a giant capacitor that allowed me to temporarily drop down there.
Ahh yes. I wore out the pages of those 3 books from the library.
Many a young kid became a young engineer with those books.
👍
Thanks for watching!
Никола Тесла .1.
"scientists" -> no -> engineers
Ah the pure engineer. When you read the history, you see tinkerers, engineers and physicists and the financial backers and small and powerhouse manufacturers all using and abusing or being run over by the patent and legal systems worldwide.
@@MIKROWAVE1 Thank you for the response. I will accept what you say. I would however incline towards calling even physicists and tinkers engineers because they were doing engineering.
@@drstrangelove09 No you are right. Actually the sharp sales guy does best anyway!
@@MIKROWAVE1 Haha! Indeed! That's aggravating that it seems to work that way!!