Showing posts with label mixer theory. Show all posts
Showing posts with label mixer theory. Show all posts
Thursday, November 21, 2024

Basic Radio Circuitry -- a 1971 film

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This 1971 training film is pretty good.  I like how they break the RF circuitry into just four components, then describe the AM receiver sta...
1 comment:
Monday, October 16, 2023

Does Matching Matter? (Diode Matching for Diode Ring Mixers) -- Nick M0NTV Finds the Answer (Video)

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I n this video, Nick M0NTV takes on a hot topic in ham radio homebrewing:  The matching of diodes in diode ring mixers.   How should the mat...
6 comments:
Saturday, March 4, 2023

Fourier Analysis Explained (video) -- Understanding Mixers

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Over the years we'vE had a lot of posts about Joseph Fourier:  https://soldersmoke.blogspot.com/search?q=Fourier Recently I've found...
Sunday, January 29, 2023

Rick N3FJZ Builds the Mixer for the High School Direct Conversion Receiver

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Wonderful progress from Rick N3FJZ.   Having completed the PTO,  Rick went on to build the diode ring mixer and diplexer.  (See video above....
Sunday, December 25, 2022

Some Direct Conversion Receiver History

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Here is the article by Wes Hayward and Dick Bingham that started it all:   https://worldradiohistory.com/Archive-DX/QST/60s/QST-1968-11.pdf ...
1 comment:
Wednesday, December 7, 2022

Is Envelope Detection a Fable? Or is it Real? Diodes, Square Laws and all that

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HOW ENVELOPE DETECTION (SUPPOSEDLY?) WORKS  Most of us grew up with the above diagram of how a receiver detects (demodulates) an AM signal. ...
16 comments:
Friday, December 2, 2022

But why? Why Can't I Listen to DSB (or AM) on my Direct Conversion Receiver?

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I've said this before:  I just seems so unfair.  We just should be able to listen to DSB signals with our beautifully simple homebrew Di...
9 comments:
Tuesday, November 15, 2022

Dhaka Jack Moves to France

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Jack Welch AI4SV has been an important member of the SolderSmoke community for many years .  I remember fondly our Straight Key Night CW con...
1 comment:
Wednesday, November 9, 2022

Direct Conversion Receiver -- Simple 2-Diode Mixer Defeats Radio Marti, but Diode Ring is the Best

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  Here is another update on Direct Conversion receiver construction. In Northern Virginia we get very strong signals from the Radio Marti t...
1 comment:
Wednesday, November 2, 2022

Understanding a Very Simple Two-Diode Mixer

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  Take a look at the simple little mixer above.  I think I first saw it in SPRAT.  Thinking that it was really just a simplified version of ...
8 comments:
Saturday, October 15, 2022

DC Receiver: 100db Gain? Diplexer? VFO in a box?

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Here is a progress report on Direct Conversion Receiver developments. Dual Tuned Circuit, Diode Ring with Diplexer, PTO VFO from Farhan...
8 comments:
Friday, October 7, 2022

How the Diode Ring Multiplies by 1 and -1 -- "The Secrets of the Diode Ring" -- Plus another Bandsweep with the DC RX

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A deeper look into how the Diode Ring detector works: "the particular go of it." Here I rely on a wonderful diagram from the RSG...
8 comments:
Sunday, October 2, 2022

Update on the Direct Conversion Receiver -- Now only 4 transistors

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I took a new look at the receiver, did some measurements, and decided to take out the RF amplifier and the AF pre-amp. The receiver works ...
Friday, September 30, 2022

Bandsweep with the New Homebrew 40 meter Direct Conversion Receiver

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It is inhaling nicely but some improvements are still pending. Click on the video above to see and listen to the bandsweep done on 40 this m...
Thursday, September 29, 2022

A Bout of Direct Conversion-ism in Northern Virginia -- DC Receivers Under Construction

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There I was, minding my own business,  when suddenly I was dragged into the construction of Direct Conversion receivers.  Here is a video ab...
Tuesday, September 6, 2022

Michael AG5VG Builds a Sub-Harmonic Receiver and Moves it to Higher Bands

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Michael AG5VG built a Sub-Harmonic Direct Conversion receiver.   But then he took it a step further and moved it up from the 80/40 meter ver...
Thursday, September 1, 2022

New Video: Farhan's Presentation on the "Daylight Again" Analog Transceiver

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LOTS of tribal wisdom in this presentation by Farhan VU2ESE.  For more info, go to:  https://www.vu2ese.com/ index.php/2022/08/04/daylight- ...
1 comment:
Saturday, August 27, 2022

SDR on a Breadboard -- But Isn't This an Old-Fashioned Fantasy?

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Nice video, but I'm afraid it is a bit of an old-fashioned fantasy.  It would be nice to think that our beloved analog mixers and direct...
1 comment:
Thursday, August 25, 2022

SolderSmoke Podcast #73 Jan 2, 2008 -- AA1TJ Circuits and Poetry, Mixers, CW, Straight Key Night at WA6ARA, Boatanchors in South Africa with ZS6ADY (Part 1)

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This is the first in a series of four podcast that include Echolink conversations with Andy ZS6ADY about old tube radios (boatanchors) in So...
Wednesday, August 10, 2022

Vasily Ivanenko on Vladimir Polyakov's Subharmonic Detector

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Our old friend "Vasily" sent in a very insightful comment about the Polyakov receiver.   It was so good that it merits a blog post...