Showing posts with label PTO. Show all posts
Showing posts with label PTO. Show all posts
Tuesday, March 14, 2023

Fixing the Tuning Problem in the High-School Direct Conversion Receiver (with video)

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Here is the problem:   For the capacitive element in the LC circuit we have essentially two 660 pF caps in series.   This results in a tot...
10 comments:
Saturday, February 25, 2023

Progress Report: High-School Students Build Diode Ring Mixers (Board #2 of 4). Hyderabad Soul Added to the New Machines

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Dean KK4DAS works with students A team from the Vienna Wireless Society was back in the local high school Thursday and Friday of this week,...
Thursday, February 2, 2023

Direct Conversion Receiver Bandscan -- 40 Meters early on a Thursday Morning -- With W1AW/4

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I superglued a San Jian frequency counter to the front panel of my High School Direct Conversion receiver.  Then I tuned it through the 40 m...
Sunday, January 29, 2023

Rick N3FJZ Builds the Mixer for the High School Direct Conversion Receiver

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Wonderful progress from Rick N3FJZ.   Having completed the PTO,  Rick went on to build the diode ring mixer and diplexer.  (See video above....
Saturday, January 21, 2023

A Call for Builders! Please help us Test this Receiver! Please Build this Receiver!

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  This is the Direct Conversion receiver that Dean and I have built.  We plan to have students at a local high school build it, starting in ...
4 comments:
Thursday, December 1, 2022

The 40 Meter Direct Conversion Receiver We Have Been Working On -- Comments Welcome

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Above is the screenshot of the LTSpice model of the 40 meter Direct Conversion receiver that Dean KK4DAS and I have been working on.  I will...
6 comments:
Saturday, November 19, 2022

A 1966 73 Magazine Article on a Homebrew Permeability Tuned Oscillator (PTO)

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In April 1966, Lewis Fitch W4VRV of Columbus, Ohio built a Permeability Tuned Oscillator.  It is remarkably similar to the devices we are bu...
1 comment:
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...

A Treasure Trove of Permeability Tuned Oscillator (PTO) Info and Links (Plus Info on Direct Conversion Receivers)

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There is really great info on this page , and even more in the links at the bottom of it.  While the page is about PTOs, the links often dis...
1 comment:
Friday, October 28, 2022

SolderSmoke Podcast #241 Mars, Direct Conversion, PTOs and Glue Sticks, Anniversary of the BITX20, Multus Proficio SDR, Boatanchor Station, MAILBAG

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The board I use to test DC RX circuits   SolderSmoke Podcast #241 is available Audio (podcast):    http://soldersmoke.com/soldersmoke241.m...
5 comments:
Wednesday, October 12, 2022

World's Most Interesting Man on PTOs and Glue Sticks

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  I mean, if they are good enough for the Dos Equis guy, maybe we should give them a chance.  (134) Glue Sticks! Chap Sticks! Paul Clark’s D...
1 comment:
Monday, October 10, 2022

Listening on 40 with a Glue Stick PTO in a Direct Conversion Receiver; Some PTO History

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Thanks to Paul WA1MAC for this idea.  He first shared it with us via the SolderSmoke mailbag in 2008!  Sorry it took so long for me to try o...
1 comment:
Sunday, October 9, 2022

Paul Clark's Dollar Store PTOs made with Glue Sticks or Chap Sticks

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A few weeks ago Pete Juliano and I got some e-mails from Paul Clark about his use of Chap Sticks and Glue Sticks (acquired at a Dollar Store...
18 comments:
Wednesday, August 17, 2022

Daylight Again on the Sunrise Net! Walter KA4KXX Builds a PTO

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Dear Bill:  I had never built a PTO, but after reading Farhan's Daylight Again Transceiver article I cobbled one together with parts an...
Tuesday, September 1, 2009

A Good Old VFO (by Rick, KK7B)

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Here is another really great message from Rick, KK7B, sent to the emrfd yahoo group: [emrfd] A Good Old VFO Saturday, August 22, 2009 10:2...
1 comment: