Showing posts with label test gear. Show all posts
Showing posts with label test gear. Show all posts
Wednesday, May 8, 2024

Why we have "BW Limit" Switches on our Oscilloscopes

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Dean KK4DAS asked me why we have these switches on our 'scopes.  I didn't know.  Dean asked Alan Wolke W2AEW.  Alan knew:  Alan Wolk...
2 comments:
Monday, March 11, 2024

Radio Items Picked-up at VWS Winterfest 2024 Hamfest

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As always, click on image for a better view Above you can see what I picked up at the Vienna Wireless Society's 2024 Winterfest Hamfest....
4 comments:
Friday, November 10, 2023

SolderSmoke Podcast #249 -- Travel, Pete's 6BA6 rig, Books!, VFOs, SDR, Computers, Spectrum Analysers, Transistor Man! MAILBAG

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New VFO for 15-10 Transceiver Schematic below SolderSmoke Podcast #249 is available:  http://soldersmoke.com/soldersmoke249.mp3 There is als...
9 comments:
Tuesday, October 3, 2023

Another Evaluation of the TinySA Ultra (with Teardown) (Video)

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More info on using the TinySA Ultra.  -- Makes me wonder if it makes sense for me NOT to enable Ultra mode now.  I am not going into the UHF...
Saturday, September 30, 2023

The TinySA Ultra Spectrum Analyser (video)

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I got mine this week, and I've been playing with it.  When I spoke to Dean KK4DAS, I asked what he thought the first thing I did with it...
Monday, September 25, 2023

Crushing Spurs with Better Bandpass Filters

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PA3AKE's passband (on screen) an mine (on NanoVNA)  While I was away in the Dominican Republic (3-9 August 2023),  I was thinking about ...
Friday, July 28, 2023

Phase Noise and the Radio Amateur

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A weak signal disappears in the phase noise of the stronger signal. The March 1988 QST provides a relatively clear explanation of what phase...
5 comments:
Thursday, July 6, 2023

The TEK 465 'Scope Used to Create Pong and the Apple II

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Wow, this is almost enough to make me take another shot at repairing my TEK 465.    
2 comments:
Friday, June 23, 2023

Part III: Curious Marc Repairs an All-Discrete Freq Counter: DO NOT ATTEMPT REPAIR OF CAVITY RESONATOR

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I love all the "DO NOT ATTEMPT" warnings.  Wow, even HP got so skittish about this stuff.  Marc has a great sense of humor and not...
Monday, June 19, 2023

CuriousMarc Repairs an old DISCRETE COMPONENT HP Frequency Counter

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I really liked this repair video from CuriousMarc (aka AJ6JV).  This counter pre-dates the use of integrated circuits -- it is all discrete ...
2 comments:
Monday, May 1, 2023

Apex Surplus in Los Angeles

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The Polaroid camera for the Tek 'scope was pretty cool.  And the comments about the Simpson 260 made me feel good about finding one at a...
1 comment:
Monday, March 20, 2023

Winterfest Loot: Who Can ID the Homebrew Receiver?

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First a big congratulations to the Vienna Wireless Society and its President, Dean KK4DAS.  In spite of low temperatures that made the Winte...
9 comments:
Tuesday, March 7, 2023

SolderSmoke Podcast #244 PETE IS BACK! TR-7, CK722, BFR106, HP8640B, High-School Receiver, 10 Min TX, MAILBAG

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SolderSmoke Podcast #244 Is available: http://soldersmoke.com/soldersmoke244.mp3 Video version at: (118) SolderSmoke - YouTube HE’S BACK! ...
1 comment:
Friday, March 3, 2023

My HP8640B Signal Generator Lives Again

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I'd really come to like this old signal generator.  The construction is superb.  It was built to be repaired.  As you open it up you fin...
5 comments:
Tuesday, February 28, 2023

A Couple of New Digital Multimeters: a Fluke and an AstroAI

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Our high school direct conversion project made me realize that I really need to upgrade my digital multimeter. I've been using an old Ra...
4 comments:
Friday, December 9, 2022

R-390s, KWM-2s, Airplanes, and Magnetic Loops -- A Really Interesting Interview with Ted Robinson K1QAR

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Eric Guth 4Z1UG has a really interesting interview with Ted Robinson K1QAR.   I really enjoyed hearing Ted's inspiring story:  https://w...
1 comment:
Sunday, November 27, 2022

Mr. Carlson's New Lab and Workbench

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I am very glad to see that Mr. Carlson is NOT slowing down.  In fact he has built another lab and is ramping up.  FB!  
4 comments:
Monday, November 21, 2022

The TinySA ULTRA: Audio out! 200 Hz Resolution! Works Up to 6 GHz! Bigger Screen! (Video)

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The improved resolution could be useful -- we may now be able to see the sidebands coming out of a mixer that is producing AF out (as in a D...
1 comment:
Sunday, November 20, 2022

Watching Shortwave Broadcast Stations on the TinySA Spectrum Analyser

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November 18, 2022 1244 UTC. I was using a TinySA spectrum analyzer to look at noise levels on the 40 meter ham radio band. I also wanted t...
3 comments:
Tuesday, September 13, 2022

Great Technical Info and Tribal Knowledge from GQRP

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Thanks to Tony Fishpool G4WIF for sending us this link.   https://www.gqrp.com/tech.htm There is a lot of great tech info and Tribal Knowled...