Very simple 2 transistor regenerative receiver gives good performance on the AM broadcast band, even driving a speaker without a transformer. Circuit, parts layout and parts list included.
Contents 0:01 Introduction 1:10 Circuit and circuit description 4:04 Demonstrating regeneration 6:28 Headphone and speaker use 9:47 Demonstration 10:23 Component layout 11:37 Parts list 12:55 Construction tips 16:51 Antenna and use 19:46 Summary 19:59 books
Experiments with 3.5 MHz pedestrian mobile with a 5 metre centre loaded vertical in the water. Stations worked were up to approximately 150km distance. The time was 8am. Interestingly the effect of touching the sand was less marked than on 40m.
Use this to calculate the inductance required for centre loaded verticals: http://www.m0ukd.com/calculators/loaded-quarter-wave-antenna-inductance-calculator/
Use this to calculate the coil dimensions for the required inductance: http://www.daycounter.com/Calculators/Air-Core-Inductor-Calculator.phtml
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https://www.youtube.com/watch?v=FfaKRIDFUho
Receiving signals from Chinese amateur satellites. These have linear transponders so can accommodate more than one contact. And they do SSB, CW and other modes.
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https://www.youtube.com/watch?v=CWgP15JNCDo
Some tests with various lengths of coaxial cable on various frequencies with various instruments. A bad length can easily chew up half your signal or more.
Note: Wind noise due to outside location.
PS: Like these videos? Wish to support this channel? If so please store this link to Amazon Shopping as a bookmark or favourite. https://www.amazon.com/s?k=amateur+radio&camp=1789&creative=9325&linkCode=ur2&linkId=459b07464cb38819b3376396431e47d3&tag=v0108-20&ref=as_li_qf_sp_sr_tl Then when you buy something I receive a small commission (at no extra cost to you). Or check my books page to see if any appeal. http://home.alphalink.com.au/~parkerp/vk3yebooks.htm
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https://www.youtube.com/watch?v=W3mD61MN2fQ
About some very simple QRP transceiver designs - including the famous Pixie.
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(then if you buy something I'll get a small commission at no cost to you)
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https://www.youtube.com/watch?v=ansQ0zPEGMc
A salvaged Australian VHF TV tuner can be an interesting receiver front-end for various VHF frequencies including the 6 and 2 metre amateur bands, FM broadcast band, airband, commercial frequencies and more. Let's see what it can do with minimal added parts!
PS: If you liked this video please consider supporting Amateur Radio VK3YE by:
* Subscribing on YouTube
* Checking my books page at https://books.vk3ye.com
* Shopping on Amazon via: https://amzn.to/3iiDQXv, or
* Shopping on eBay via: https://ebay.us/i9DuWP
(then if you buy something I'll get a small commission at no cost to you)
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https://www.youtube.com/watch?v=VzykX6Nvk7Q
Want more gain from an LM386 audio amplifier? Tried the usual capacitor across pins 1 & 8? Watch to see how to get more with just three extra parts.
The project shown is a HF double sideband amateur radio transceiver whose receiver derives all its gain from a hotted-up LM386. For more details see the circuit walkthrough in Parts 1 to 3.
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https://www.youtube.com/watch?v=mLCbnL5e_VA
No one wants old desktop computers anymore. You often see them on the street. This video is about how you can use parts salvaged from them for radio and electronics projects.
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https://www.youtube.com/watch?v=TPuoR1r00y4
A cheap wind-up LED torch wasn't holding its charge. So it was opened, the torch wires disconnected and the generator output brought to external wires.
Its voltage output was measured - both without and with resistive loads. A resistor burns and smells as the generator's output was somewhat greater than realised. However it means that many electronic items could possibly be converted to wind-up operation.
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https://www.youtube.com/watch?v=2E0-6vC_JDA