Showing posts with label DeMaw--Doug. Show all posts
Showing posts with label DeMaw--Doug. Show all posts
Monday, April 29, 2024

Old Tricks, Lore, and Art -- Freezing and Baking our LC VFOs -- An Example from Cuba

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Pavel CO7WT explained why Cuban hams used a process of thermal endurance to improved the frequency stability of their homebrew rigs:    ----...
5 comments:
Monday, April 8, 2024

The Doug DeMaw Article that got me into Homebrew Double-Sideband

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Just click on the images for a better view Pete WB9FLW asked for this.  This was an important article for me -- it paved the way for my entr...
1 comment:
Wednesday, April 26, 2023

Retro QRP Rigs of the 1960's, 70's, and 80's -- Video by Mike WU2D

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It is time to put aside (again!) all of the heated ideological arguments about the power level that defines "low power."  Just sit...
3 comments:
Thursday, April 13, 2023

The Franklin Oscillator: A Super-Stable VFO. Why No Attention? Why So Little Use?

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My Franklin VFO Lee KD4RE of the Vienna Wireless Society has been talking about the Franklin oscillator. He has been telling us that it is v...
16 comments:
Tuesday, April 11, 2023

Arnie Coro: Jaguey Rig Designed in 1982, More info on the Rig

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Jaguey, Matanzas, Cuba Dxers Unlimited's mid week edition for 23-24 October 2007 By Arnie Coro Radio Amateur CO2KK ... My own personal ...
Friday, December 2, 2022

But why? Why Can't I Listen to DSB (or AM) on my Direct Conversion Receiver?

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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:
Wednesday, November 2, 2022

Understanding a Very Simple Two-Diode Mixer

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  Take a look at the simple little mixer above.  I think I first saw it in SPRAT.  Thinking that it was really just a simplified version of ...
8 comments:
Friday, September 16, 2022

Fixing Up An Old Homebrew Rig -- Barebones Superhet and VXO 6 Watter

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  I'm not exactly sure why I pulled this old rig off the shelf, but I'll write up what I did -- I often use this blog as a kind of n...
3 comments:
Tuesday, July 19, 2022

Putting a Real LC VFO in My Ceramic-Resonator, Direct Conversion 40 Meter Receiver. LC JOVO! (Video)

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This is the DC receiver that I built back in 2017-2018. I had used a ceramic resonator in the VFO. That receiver was on the cover of SPRA...
2 comments:
Monday, February 7, 2022

SolderSmoke Podcast #235 NE-602, Azores Rig, Spur Problems, SSB Rigs, Peashooter, HB Filters, MAILBAG

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SolderSmoke Podcast #235 is available for download:  http://soldersmoke.com/soldersmoke235.mp3 Travelogue: 6 weeks in the DR for Bill One co...
7 comments:
Tuesday, December 7, 2021

Junk Box Sideband from the Azores (2004 QST Article)

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About 20 years after I first built it, I find myself working on and using this SSB transmitter.    I recently added some impedance matching...
1 comment:
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 6, 2021

M0NTV's "Crystal Filters for the Fearful" (video)

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I really liked Nick M0NTV's approach to making a crystal filter (see video above).  He really simplifies a process that desperately need...
4 comments: