Showing posts with label NanoVNA. Show all posts
Showing posts with label NanoVNA. Show all posts
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 ...
Monday, July 10, 2023

Martein's Bandpass Filters - PA3AKE

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Above you can see the really nice 15 meter filter that I built using data provided by Martein PA3AKE.  https://martein.home.xs4all.nl/pa3ake...
9 comments:
Thursday, March 16, 2023

A Very Cool Video with NanoVNA, FFT, LC circuits, W2AEW, CuriousMarc, Back-to-Back 1N4148s, and String-Powered Gyroscopes

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Don't let the scary nuclear chemistry title put you off -- there is a LOT of very familiar homebrew stuff in this video.  You will feel ...
1 comment:
Tuesday, January 4, 2022

Exorcism Completed! Getting Rid of the Spur in my 17 meter SSB Transmitter using a TinySA (video)

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To re-cap:  The problem became evident when trying to "net" or "spot" my transmitter onto my receive frequency.   Arou...
5 comments:
Tuesday, November 30, 2021

Putting a Barebones Superhet on 17 Meters with an NE602 Converter (Video)

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Armed now with a NanoVNA, I took a look at the passband of the 5 MHz filter in my Barebones Superhet (BBRX)  W4OP built it on a Circuit Boar...
Saturday, November 20, 2021

The Double Crystal Lattice Filter in the Swan 240 -- Smoothing it out with a NanoVNA

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In SolderSmoke Podcast #234, I said that I was scrutinizing the filter from the Swan 240 that I had picked up around 1994 in the Dominican R...
2 comments:
Wednesday, November 17, 2021

SolderSmoke Podcast #234: PSSST, KWM-1, VHF Woes, Mighty Midget, TinySA, 17-12 Dual-Bander Advice Needed. MAILBAG

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http://www.gadgeteer.us/17SSB.HTM SolderSmoke Podcast #234 is available:  http://soldersmoke.com/soldersmoke234.mp3 Roots of SolderSmoke: Th...
5 comments:
Friday, November 12, 2021

Mate for the Mighty Midget with 6 kHz Ceramic Filter

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I built this receiver back in 1998, but I continue to have fun tinkering with it. I wrote an article about it for "Electric Radio"...
1 comment:
Friday, November 5, 2021

The Importance of Keeping the Noise FLAT

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  A few days ago I put up a blog post about using a noise generator (in my case my cheap FeelTech sig generator) and my TinySA spectrum anal...
9 comments:
Monday, October 25, 2021

Putting a Ceramic Filter in the "Mate for the Mighty Midget" Receiver

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It is really simple.  I had one of the +/- 3kHz (6 kHz wide) 455HT filters on hand.  The spec sheets call for 2000 ohms at both ends, but lo...
3 comments:
Friday, August 27, 2021

SolderSmoke Podcast #232 -- Mythbuster, Pete's Tube CW Rig, Pete's DC RX and Simple SSB Rig, NanoVNA and TinySA, Very FB Mailbag

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SolderSmoke Podcast #232 is available -- Crank it in Robert! http://soldersmoke.com/soldersmoke232.mp3 Featuring a guitar intro by Pete ...
1 comment:
Monday, August 2, 2021

Mythbuster Video #12 -- Bandpass Filters

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The really cool part comes at the end when I put the scope probe on the output, then on the input of the bandpass filter.  Exciting stuff my...
1 comment:
Wednesday, July 28, 2021

50 Shades of Homebrew? PH2LB's Shack and NanoVNA Adapters

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  That would have been a very different movie.   And I don't think the box office results would have been favorable.   That's PH2LB...
3 comments:
Sunday, July 18, 2021

Alan Wolke W2AEW's Great Video on Using NanoVNA to Measure Amplifier Input Impedance and Gain

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Alan Wolke W2AEW is a true wizard.  We are all lucky to be interested in homebrew radio at the same time that he is sharing his knowledge an...
4 comments:
Monday, July 12, 2021

Mythbuster Video #2 -- 10 Pole Crystal Filter

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This is a 5.2 MHz crystal filter. I used the G3UUR method for determining the crystal's motional parameters. I then used Dishal and AA...
5 comments:
Saturday, July 3, 2021

M0NTV's Latest Breadbox Rig -- The Radio Gods Have Spoken (TRGHS)!

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Tony G4WIF sent me this video from Nick M0NTV.  It presents Nick's latest Bread Bin project -- "The Optimizer."  -- I really l...
Wednesday, June 30, 2021

10 Pole Crystal Filter Passband as Seen in Antuino and NanoVNA

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I continue to work on the "Mythbuster" rig,  but I am taking it slow, trying to learn something from each stage.  I'm especial...
Saturday, June 26, 2021

SolderSmoke Podcast #231 -- Travel, SST, Mythbusting, Filters, TIAS, NanoVNAs, DC RX in SPRAT, Drake A Line, Spillsbury, STICKERS! Mailbag

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SolderSmoke # 231 is available:  http://soldersmoke.com/soldersmoke231.mp3 Annual Field Day Special Edition Travelogue:   To the Dominican R...
1 comment:
Thursday, December 10, 2020

Pete Juliano's Presentation to the 2020 G-QRP Club Convention -- Building SSB Transceivers

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It is a great day my friends.  G-QRP has posted on YouTube the presentations made at their 2020 convention.  TRGHS!  Above you can see the a...
4 comments:
Sunday, July 26, 2020

Alan Wolke W2AEW on IMD, NanoVNA and more (presentation to UK club)

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This video is another reminder of how lucky we are to have Alan Wolke W2AEW as a fellow radio amateur, and as a teacher and mentor.  In ...
1 comment: