A while ago, the #SolderSmoke podcast issued a challenge to build a 40 meter (7 MHz). direct conversion receiver. They created schematics and videos detailing the process.
The ham shack resource manager (KA1PQK) at #MakeItLabs organized a group project. Together, we each built our own copy of each module (oscillator, mixer, band-pass filter, and amplifier).
I decided to go a bit further than mounting it on a simple board ...
#Soldersmoke
The thing I really like about the #SolderSmoke #podcast is that it's just some guys sitting around BSing about #HamRadio. No particular topic or anything else. Relaxed and informal. They remind me a lot of the guys I hang out with locally.
Last night, we assembled and tested the individual boards we've been constructing in the #SolderSmoke Direct Conversion Receiver challenge into a complete radio. Tuning is a bit fussy, but it worked. Now for some woodworking and other "packaging" tasks.
Last night's build in the #SolderSmoke Challenge was the last module - the audio amplifier. Now to connect them all together in the cigar box I've gotten to house the completed project.
The joy of oscillation!
I turned on the first module of the Soldersmoke direct conversion receiver challenge radio. It worked!
Last night's build was the band pass filter for the #SolderSmoke Direct Conversion Receiver Challenge. Three out of Four boards completed!
This week's part of the #SolderSmoke Direct Conversion Receiver Challenge is the mixer board. I don't know how my soldering skills could have gotten even worse! As bad as it looks, it is "mixin."
Several of us at #MakeItLabs have begun the #SolderSmoke challenge direct conversion receiver. Last night we constructed the oscillator. Please forgive my poor soldering skills. 😃
SolderSmoke: Monitoring Maritime Radio Messages with YADD
https://swling.com/blog/2024/10/soldersmoke-monitoring-maritime-radio-messages-with-yadd/
Email prompts Bill to pull his regenerative receiver off the shelf!
https://swling.com/blog/2024/05/email-prompts-bill-to-pull-his-regenerative-receiver-off-the-shelf/
#BillMeara #Homebrew #RegenReceivers #RegenerativeReceivers #Soldersmoke
@jeffpc OK, I'm in no mental shape to think about this right now (low on sleep), but I think this is leading toward the right answer for a common-emitter amplifier: https://eng.libretexts.org/Bookshelves/Electrical_Engineering/Electronics/Book%3A_Semiconductor_Devices_-_Theory_and_Application_(Fiore)/07%3A_BJT_Small_Signal_Amplifiers/7.3%3A_Common_Emitter_Amplifier
(next section is common-collector, for comparison)
But I'm not sure what the "load impedance" is. Shouldn't it be the impedance looking back into the amplifier?
Possible related, #SolderSmoke discusses measuring (not calculating) this in episodes 231 and 232. #hamRadio
SolderSmoke: 7J6CBQ on Okinawa — And a Translation of a Science Fiction Novel about Ham Radio in China
Are N2CQR and N6QW okay? http://www.soldersmoke.com/ #SolderSmoke #HamRadio
SolderSmoke: Super Solar Storms May Not Be So Rare
https://swling.com/blog/2023/12/soldersmoke-super-solar-storms-may-not-be-so-rare/
A free book from the early days of ham projects with transistors: The CK722
The impact of the CK722 on Pete Juliano, on ham radio, and eventually on SolderSmoke was quite profound.
The book was the size of a notebook and had a gray cover. Pete built some of the projects like the CPO. If you had a CK722 then you were there.
Bill’s Shortwave Listener QSL Cards
https://swling.com/blog/2023/11/bills-shortwave-listener-qsl-cards/
1971 “Hippy” Shortwave Listening
https://swling.com/blog/2023/11/1971-hippy-shortwave-listening/
@quantensalat rocking #ManhattanStyle there; the #SolderSmoke fellas would surely love it
Soldersmoke: Mattia Zamana’s Amazing Direct Conversion Receiver
https://swling.com/blog/2023/10/soldersmoke-mattia-zamanas-amazing-direct-conversion-receiver/
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