Showing posts with label ceramic resonators. Show all posts
Showing posts with label ceramic resonators. Show all posts
Monday, August 8, 2022

Polyakov (RA3AAE) Direct Conversion Receiver: 40 meter DC RX with VFO at 3.5 - 3.6 MHz (with video)

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I've been reading about Polyakov (or "sub-harmonic") Detectors for a long time:  https://soldersmoke.blogspot.com/search/label...
4 comments:
Tuesday, July 19, 2022

Putting a Real LC VFO in My Ceramic-Resonator, Direct Conversion 40 Meter Receiver. LC JOVO! (Video)

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This is the DC receiver that I built back in 2017-2018. I had used a ceramic resonator in the VFO. That receiver was on the cover of SPRA...
2 comments:
Thursday, February 17, 2022

How The Physics of Resonance Shapes Quantum Reality

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Here is an interesting article that appeared in Wired.  It will resonate with many SolderSmoke listeners! https://www.wired.com/story/how-th...
Monday, October 25, 2021

Putting a Ceramic Filter in the "Mate for the Mighty Midget" Receiver

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It is really simple.  I had one of the +/- 3kHz (6 kHz wide) 455HT filters on hand.  The spec sheets call for 2000 ohms at both ends, but lo...
3 comments:
Saturday, July 11, 2020

Q-31 Receiver Filter Fix with the NanoVNA

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The picture above shows my problem. As predicted by the Murata data sheet and as warned by R.A. Penfold, that nice 455 kc ceramic filt...
6 comments:
Friday, November 1, 2019

Direct Conversion (videos)

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Here are a couple of videos from 2017 (never posted before).  I built a little 40 meter Direct Conversion receiver for my nephew John He...
1 comment:
Sunday, December 17, 2017

Building the Ceramic Direct Conversion Receiver Part 2 -- Building the VFO -- Our Goal is JOVO!

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DC RX VFO and Buffer I'll put the full schematic at the bottom of each of the posts so that you can easily refer to the big pictu...
9 comments:
Sunday, December 3, 2017

Discrete Ceramic 40 Meter Direct Conversion Receiver in Action (Video) -- BUILD THIS THING!

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I've been holding off on making this video until I improved the stability.  N6QW is vigilent!  I only did this video after certifying ...
6 comments:
Tuesday, November 28, 2017

Videos of iPhone Box DC Receiver

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These are just a couple of short videos that I made for my nephew before sending him this receiver.  As you can hear, deafness is ...
3 comments:
Saturday, November 25, 2017

Polyvaricon Variations -- Polyvaricons Are Not all The Same

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When I built the first prototype of the iPhone DC receiver, I just reached into my junk box and used a polyvaricon capacitor for the main...
2 comments:
Thursday, August 24, 2017

The Return of Pete's Simple-ceiver Plus (and a possible analog option)

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Winter is approaching ladies and gentlemen, and it is time to think about radio projects.   Bob N7SUR suggested a direct conversion recei...
4 comments: