Showing posts with label EMRFD. Show all posts
Showing posts with label EMRFD. Show all posts
Wednesday, May 1, 2024

KE5HPY Builds a QRP Transmitter

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  FB Chuck, very cool.  Please send us more reports on this rig.   Chuck has been on the blog many times, with many projects:  https://solde...
1 comment:
Monday, October 16, 2023

Does Matching Matter? (Diode Matching for Diode Ring Mixers) -- Nick M0NTV Finds the Answer (Video)

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I n this video, Nick M0NTV takes on a hot topic in ham radio homebrewing:  The matching of diodes in diode ring mixers.   How should the mat...
6 comments:
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, 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...
21 comments:
Monday, April 3, 2023

Technology and Methods from Wes Hayward W7ZOI

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Great stuff.  Lots of wonderful articles filled with wisdom to ponder.    http://w7zoi.net/oldtech/ponder.html Thanks to Tony G4WIF for spot...
1 comment:
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:
Saturday, May 28, 2022

"Experimental Methods in RF Design" LADPAC Software Available FREE!

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We've frequently said that is pays to check the W7ZOI web site.  Tony G4WIF did just that and pointed us in that direction, noting that ...
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, November 2, 2021

Farhan's Amazing Knack Story: From a Boyhood SW Receiver to the Design of the sBITX SDR

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The presentation starts at about the 4 minute point.  I think if I were only allowed to watch one YouTube video in the next year, I'd ma...
2 comments:
Friday, May 28, 2021

Farhan's sBITX -- Combining SDR with the Traditional Superhet

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Here is Farhan's amazing presentation to the virtual 2021 FDIM event.  There is a lot of tribal knowledge in this video.  Lots of old an...
4 comments:
Monday, November 30, 2020

Adam N0ZIB's Direct Conversion Transceiver

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This is obviously very cool, but looking ahead I think Adam should think about adding one more mixer, changing the bias on the TX amps, and ...
5 comments:
Thursday, October 15, 2020

Too Simple? Deficiency of the Lafayette HA-600A Product Detector?

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  I've been having a lot of fun with the Lafayette HA-600A receiver that I picked up earlier this month.  Adding to the mirth, I noticed...
9 comments:
Monday, August 24, 2020

Experimental Methods Book on Clearance sale -- $20

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http://www.arrl.org/shop/Experimental-Methods-in-RF-Design-Classic-Reprint-Edition/ And it includes a .pdf copy of Solid State Design fo...
4 comments: