Just go to http://soldersmoke.com. On that archive page, just click on the blue hyperlinks and your audio player should play that episode.
http://soldersmoke.com
You know that you are sinking deep into The Knack when you watch a video like this one and find yourself thinking: "FANTASTIC! WOW! Now I know why square waves are better!" I really liked this one. In the beginning I was kind of concerned about his refusal to explain how non-linear, non-switching mixers work. He actually used the dismissive non-explanation that I've always found so disappointing: "Blah, blah, blah... it's in the trig." And he actually said, "Blah, blah, blah." But he more than made up for it when he got into the switching mixers. Note that his drawing (at the start) of "Mixing by Switching" attempts to show the waveform that results from an LO "chopping up" an incoming RF signal. I always find that picture worth a thousand trig equations.
I also really liked his explanation of the benefits of rapid rise time in switching mixers, and how slow switching causes the diodes to spend some time in the non-linear part of their curves, giving rise (!) to IMD products (I'm paraphrasing). You can really see why they say it is better to drive diode rings with square waves. So stop trying to put low pass filters between your LO and the diode ring. Square waves are your friends here. Mr. Marki seems to be one very cool EE. And I'd like to hear more about his dad. Here is some more about the Marki engineers:
"SolderSmoke -- Global Adventures in Wireless Electronics" is now available as an e-book for Amazon's Kindle.
Here's the site:
http://www.amazon.com/dp/B004V9FIVW
Bill's OTHER Book (Warning: Not About Radio)
Click on the image to learn more
Where are the readers of SolderSmoke Daily News?
Pete Juliano N6QW
Master Homebrewer
Dean Souleles KK4DAS
With beret and with a Michigan Mighty Mite in hand
Re: A Pin Drop
-
Well, Tom, if you never build another big rig, many of us will miss
reading about them here in the forum. But, and this is coming from a guy
who thus fa...
Dan takes us on a South Pacific Tour!
-
Many thanks to SWLing Post contributor, Dan Greenall, who writes: In years
gone by, many Pacific island nations relied on shortwave radio to air their
prog...
Taking a Break!
-
I have been consumed by Project X and I need to take a break. The stark
realization is that this rig even when 100% was likely chewing gum and
bailing wire...
HRWB 241 - Field Day 2025 Debrief
-
In this episode the whole team gets together and talks about our Field Day
2025 experience. Everyone's Field Day was a bit different. From casual
mobil...
WA2TBQ
-
Episode 527 - Ron Demcko - WA2TBQ Ron Demcko, WA2TBQ, found his way into
electronics—and later amateur radio—thanks to the early influence of his
older bro...
The Communicator July - August 2025
-
*A Big One to Last the Summer*
We're coming up to our club's 50th Anniversary and this is another big
issue, with a look back at our history, great article...
A Real ZN414!
-
Recently, I built a simple little TRF receiver for the AM broadcast band
using a TA7642, a modern equivalent for a chip that was quite popular with
electro...
The "George Batterson 1935 CW QSO Party" - Summary
-
The first *George Batterson CW QSO Party* has concluded and the results are
in! The "*GB*" was introduced to honor George Batterson (W2GB), who along
wi...
KK4DAS MB 20 Transceiver Complete
-
The MB 20 transceiver is now complete. The rig is a homebrew 10-watt
20-meter SSB transceiver. The VFO module was an ebay purchase of a
salvaged Yeasu...
A Curious 9 MHz Crystal from Mouser Electronics
-
Just a quick post to share info about a good 9 MHz crystal sold by Mouser
Electronics.
I last purchased batches of crystals for xtal IF filters back in 2...
40m Pelican Case SSB Transceiver
-
See YouTube channels for details:
http://www.youtube.com/c/CharlieMorrisZL2CTM
*Test code for the LCD and Si5351*
#include
...
Hollow-State Design, 3rd Edition
-
Hollow-State Design, 3rd Edition is available from: Lulu Press:
tinyurl.com/hollowstatedesign3 eBay: search for “hollow-state design”
Electric Radio bookst...
I Finally Bought My Dream Airplane
-
Aviation has been a love of mine since I was a very little person. Living
in Nevada, seeing posters and ads for the Reno Air Races, specifically the
Texa...
Daylight Again – An all Analog Radio
-
What’s all this? In 10 seconds, A high performance, 7MHz, 5 watt SSB rig
Draws just 24 mA of current 90 dB dynamic range, 80 dB close-in dynamic
range 3D ...
Modifications to the Dayton/FDIM-2019 Antuino
-
The Dayton Antuino has sub-optimal performance. This is a short note on
improving it to an 80 db range of measurements. The trouble with Antuino
2.0 (the o...
Raduino as NBFM TX
-
Here is a neat, 30 minute hack for your Raduino to turn the Si5351 into a
pretty stable, solid NBFM transmitter. The hack is to add a varactor diode
in ...
QRP Labs shop!
-
[image: Shop]
All QRP Labs kits may be ordered online securely at the shop, with PayPal
payment.
*Click here to visit the shop!*
*Click!*
*Shop! Order...
Very interesting video.
ReplyDelete