Showing posts with label SPRAT. Show all posts
Showing posts with label SPRAT. Show all posts
Wednesday, March 13, 2024

Using the RF Power Amplifier of the BITX40 Module

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  PA shematic from the BITX 40 Module Click on the diagram for a better view C.F. Rockey W9SCH (who alerted us in SPRAT 22 to the chicken sa...
5 comments:
Friday, April 7, 2023

More Info on the Cuban Jaguey Solid State DSB Transceiver

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ZL2BMI Transceiver Layout (not full size here!)  Continuing our search for information the Cuban "Jaguey" DSB rig, Trevor Woods po...
6 comments:
Tuesday, November 15, 2022

Amazingly Cool MONTV Video on Direct Conversion Receivers with Glue Stick PTOs

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I think this is one of Nick's best videos. And he has made a lot of good ones.  https://www.youtube.com/watch?v=xl9dnajkYO0 This is a re...
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:
Thursday, August 11, 2022

What Coil for the Polyakov Input Circuit? How to calculate a coil value for resonance.

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So,  what is the value for L1 and L2?   What coil should I use?   Michael AG5VG had that question.  And so did I when I built this receiver....
7 comments:
Monday, August 8, 2022

Polyakov (RA3AAE) Direct Conversion Receiver: 40 meter DC RX with VFO at 3.5 - 3.6 MHz (with video)

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I've been reading about Polyakov (or "sub-harmonic") Detectors for a long time:  https://soldersmoke.blogspot.com/search/label...
4 comments:
Friday, August 5, 2022

SolderSmoke Podcast #239: Hex DX, VFO Temp Comp, DC RX, Polyakov!, DX-100, Wireless Set, Farhan's "Daylight Again" HDR rig, MAILBAG

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N2CQR Hex Beam Aimed at Europe SolderSmoke #239 is available for download:  http://soldersmoke.com/soldersmoke239.mp3 TRAVELOGUE :   James...
1 comment:
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:
Sunday, June 26, 2022

ZL2BMI Double Sideband QRP Transmitter in SPRAT #191

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Very cool that SPRAT had a Double Sideband (DSB)  transmitter article in its current issue (#191 Summer 2022). The author is DSB guru Eric S...
Tuesday, December 28, 2021

How to Fix the Spur Problem in my 17 Meter SSB Transmitter?

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  I built the transmitter almost 20 years ago.  It is in the larger box, which originally housed a Heathkit DX-40.  There is a lot of soul i...
6 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:
Wednesday, October 13, 2021

SolderSmoke Podcast #233: PIMP, Boatanchors, Novices, MMM, Heathkits, DC Receivers, Mailbag

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SolderSmoke Podcast #233 is available.  http://soldersmoke.com/soldersmoke233.mp3 Travelogue: Cape Cod. SST. Marconi Site. The WFSRA:  ...
7 comments:
Thursday, August 12, 2021

Grayson Evans KJ7UM on the Ham Radio Workbench Podcast

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  OM Grayson was on the HRWB podcast with George Zaf and company. This was a really informative and entertaining session.  For example, when...
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:
Tuesday, May 4, 2021

Ciprian's Romanian Ten Minute Transmitter with Roots in SPRAT, KA4KXX, and the Florida Sunrise Net

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It sounds great Ciprian!  It was really cool to see your video and hear you reference not only  the SolderSmoke blog, but also SPRAT, the Mi...
16 comments:
Thursday, March 11, 2021

Hodgepodge: Moving the Carrier Oscillator Frequency (and a Flashback to 2002) (Video)

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As explained in the video, in the course of using my RTL-SDR dongle I noticed that the signal being put out by my Hodgepodge rig had some ...
2 comments:
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:
Friday, November 13, 2020

How Does My Singly Balanced, Two-Diode, Single Transformer Product Detector Really Work?

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  As young James Clerk Maxwell used to say, "What's the go of it?"  and "What's the particular go of it?" I stu...
4 comments: