Showing posts with label AM. Show all posts
Showing posts with label AM. Show all posts
Monday, February 19, 2024

Jean Shepherd has Trouble with his Heising Modulator (and his date)

›
This is probably Jean Shepherd's best program about homebrew ham radio.  It is about how we can become obsessed with the problems that a...
Wednesday, January 17, 2024

Listen to this great contact with KA1BWO on 10 meter AM -- 1800 miles with 4 watts AM

›
Joe KA1BWO is a well-known AM operator who moved West to Idaho several years ago.  We had a very nice contact on 10 meter AM on January 14, ...
2 comments:
Saturday, December 23, 2023

1000 Mile QSO with KC5U using Modified CB Rigs (video)

›
Eldon KC5U saw my blog posts about Jerry K5JC’s mods to the PLL02 CB rigs. Here is the mod: http://www.jcoffman.net/WB5RUA/10_meter_AM_conv...
4 comments:
Tuesday, November 21, 2023

On my Second Day on 10 meter AM, I Worked K5JC -- the Creator of the Mod that I was Using (Video)

›
See video above.  T his happened on my second day on 10 meter AM. I was using the little GE CB radio that I had modified for 10 meters. I ...
8 comments:
Thursday, November 16, 2023

Bill N2CQR Goes Citizen Band

›
 10-4 Good Buddies! 
4 comments:
Wednesday, September 27, 2023

Ciprian YO6DXE Puts the Michigan Mighty Mite on AM! (video)

›
Excellent work Ciprian!   Here we have a Michigan Mighty Mite being modified for AM in Romania, with input from Hungary, and inspiration fro...
1 comment:
Thursday, April 6, 2023

Helge LA6NCA Builds a Double Sideband Thermatron Transmitter

›
Helge is an amazing homebrewer. Check out the shack.  Note the R-390 and the Tek  'scope.  Watch how Helge designs his rig.  Watch him c...
Friday, March 24, 2023

Homebrew AM from Cuba

›
Jose CO6EC sent us more information about homebrew rigs built in Cuba.  The transmitter above is a thing of beauty.   I am really glad that ...
3 comments:
Thursday, March 23, 2023

More Cuban Homebrew from the 80's and 90's -- A 160 Meter AM (Controlled Carrier) TX with Soviet 6P23s

›
  160 Meter Transmitter Jose CO6EC writes:  I will be sending you some work of homebrew from the 80's and 90's when practically ever...
Saturday, March 18, 2023

The Islander -- A Homebrew DSB Rig from Cuba

›
  This article, the pictures, and the comments are all so cool. They really capture the spirit of homebrew.  Obviously we still need more in...
1 comment:
Monday, February 13, 2023

The Infinite Impedance Envelope Detector (done with an FET)

›
Recently a fellow ham claimed that "envelope detection" doesn't really exist , and that the standard "rectification and f...
3 comments:
Tuesday, January 10, 2023

SolderSmoke Re-Play: Shep tries to build a Heising Modulator -- Shep on Parasitics and Troubleshooting: "That way madness lies"

›
You guys really have to listen to this.  This is culturally important.    In this 1965 radio broadcast, Jean Shepherd describes his teenage ...
Wednesday, December 7, 2022

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

›
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?

›
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: