Showing posts with label JBOT. Show all posts
Showing posts with label JBOT. Show all posts
Tuesday, March 5, 2024

A Contact with my Old Azorean DSB Transceiver

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I've been thinking about balanced modulators, and I wanted to see how some of my early circuits performed.  So I pulled this OLD Double ...
Saturday, November 22, 2014

SolderSmoke Podcast #168 Software Inefficiencies! DSB Blues! Schematic Errors! QRO Confessions!

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SolderSmoke Podcast #168 is available.  22 November 2014  http://soldersmoke.com/soldersmoke168.mp3 The benefits of software inefficie...
4 comments:
Sunday, November 16, 2014

N2CQR WINS ARRL SWEEPSTAKES! AGAIN! (video)

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We did it AGAIN!   Winners in the Homebrew Double-Sideband QRP Northern Virginia Category!   Sweet!  I can't wait to pick up the troph...
1 comment:
Monday, January 21, 2013

Swamping or Q-Killing

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Sounds like some new TV series on the Discover Channel, doesn't it? Actually it refers to efforts to stabilize oscillators by reducin...
4 comments:
Monday, December 24, 2012

A Christmas Present from Argentina

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There is an old saying in Spanish:  "No hay mal que por bien no venga."   More or less this is the same idea as: "Every ...
1 comment:
Sunday, December 23, 2012

Woe is me! Why Podcast is Late: Parasitic Oscillations!

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I'm building my FOURTH JBOT and this one is giving me more trouble than all the others combined.   Here are the details of my tal...
4 comments:
Friday, March 9, 2012

JBOT Thoughts

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Posted today to the BITX-20 Group: Good to see so many JBOTs under construction. I recently built two of them. Farhan has asked me to shar...
Monday, January 30, 2012

My .02 KW Linear Amplifier

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Once again, die-hard QRP guys should probably look away at this point... My Cycle 23/Cycle 24 refurbishing project continues. The JBOT amp...
4 comments:
Sunday, January 29, 2012

Putting 17 Meter SSB Station On the Air

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Magnificent, don't you think? The sun is rising over Northern Virginia, and 17 meters is starting to come alive. Yesterday I finished...
2 comments:
Wednesday, January 25, 2012

Toroidal Travails II

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Steve Smith sent me a good article on broadband transformers. Reading through it, it occurred to me that perhaps using a heavier gauge wire...
3 comments:
Tuesday, January 24, 2012

Toroidal Transformers: Does Size Matter?

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I continue to tweak and peak the JBOT amplifier in the Azores 17 SSB transmitter. On this version I used some FT-50-43 toroidal cores inste...
8 comments:
Saturday, January 21, 2012

JBOT Installed in Azores 17 Meter SSB Rig

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Even though one of their Coronal Mass Ejections is due to hit us soon, the radio gods have been quite kind to me this morning. I installed...
Tuesday, January 17, 2012

Another JBOT Amplifier

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Over the weekend I built another JBOT 5 watt linear amplifier ( design by Farhan ). I used a nice piece of copper-clad board that Dave, W8...
4 comments:
Thursday, November 17, 2011

Amplifier Woes -- Help me! Help me!

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When I look in the mirror and I see a haunted, obsessed look in my eyes. My wife senses that there is something wrong in the ham shack. Sh...
9 comments:
Thursday, November 10, 2011

JBOT Amplifier Installed in Azorean DSB Rig

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I 've been remiss in posting to the blog, but I have a good excuse: I've been melting solder. I have working on the installation o...
3 comments:
Wednesday, October 19, 2011

Oh No! Short Circuit Danger with Anodized Heat Sinks?

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Our friend Brent out in Minneapolis sent me some pre-Halloween HB frights yesterday. I'm still concerned. Am I living dangerously wit...
1 comment:
Tuesday, October 18, 2011

My JBOT 5 Watt Linear (Farhan's Design)

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There it is -- my version of Farhan's JBOT 5 watt linear amplifier . JBOT stands for "Just a Bunch of Transistors." But I th...
6 comments: