A demonstration of a home-made AM broadcast receiver.
The set uses two transistors (MPF102 FET & BC548 NPN) and one audio IC (TDA 2822).
The test was done in the middle of the day with no external antenna. If done at night many interstate stations would have been heard.
The circuit of an earlier version (without the IC audio amp) appears here: http://www.alphalink.com.au/~parkerp/
...
https://www.youtube.com/watch?v=4pUWl36Z8Wo
A magnetic loop that fits inside a laptop computer bag. It's inefficient but works for WSPR on at least 7 and 10 MHz. A lower value of variable capacitor would also allow coverage of all bands up to 50 MHz. Video describes construction and demonstrates its use on 7 and 10 MHz for SSB receiving and WSPR transmitting.
PS: To support this channel please start your Amazon Shopping here (no extra cost to you) https://www.amazon.com/?&_encoding=UTF8&tag=v0108-20&linkCode=ur2&linkId=76822b913d6201ba868f1e9c3c326184&camp=1789&creative=9325
...
https://www.youtube.com/watch?v=BC5lFbLqaeg
Some listening on a 160/80/40m receiver that may become a transceiver. Most of the circuitry is from the Bitx20 http://kambing.ui.ac.id/onnopurbo/orari-diklat/teknik/homebrew/bitx20/bitx20.pdf For the DDS VFO I used the N3ZI module. https://www.pongrance.com/
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
...
https://www.youtube.com/watch?v=h7fTwfD13Sk
Answers to questions from viewers on a range of topics including magnetic loop antennas, end-fed antennas, crystal sets, kits and more.
...
https://www.youtube.com/watch?v=hvQWWMg-KUg
Operating HF pedestrian mobile on a local beach using the Wadetenna 7 - 50 MHz pedestrian mobile antenna.
...
https://www.youtube.com/watch?v=tr4544ZbGwE
Testing a 30m perimeter rectangular loop antenna. It is a full wavelength on 10 MHz and 3/4 wavelength on 7 MHz. Feeding is with slotted ribbon feedline with a balanced antenna coupler.
I transmit WSPR bursts with it being vertically polarised and horizontally polarised. Then I compare the reports received via WSPRnet. There are some substantial differences when I change the antenna's polarisation by moving the location where the loop is fed.
Voice (love it or loathe it) is from: http://www.text2speech.org/
PS: To support this channel please start your Amazon Shopping here (no extra cost to you) https://www.amazon.com/?&_encoding=UTF8&tag=v0108-20&linkCode=ur2&linkId=76822b913d6201ba868f1e9c3c326184&camp=1789&creative=9325
...
https://www.youtube.com/watch?v=L9OByHMxhPs