SolderSmoke Podcast #201 is available: http://soldersmoke.com/soldersmoke201.mp3
9 December 2017
Santa Juliano
Forest fires, snow storms, and an earthquake.
Santa arrives from Hyderabad -- uBITX in the house.
Radio history. First transtalantic amateur contacts.
Bill's International Brotherhood Ceramic Discrete Direct Conversion Receiver Project.
-- Goals -- Build your own receiver. Really. From scratch. No cheating.
-- How to get started. Get parts and tools.
-- Stage by stage.
-- VFO first -- maybe build two.
Bill built two already
-- Nephew is testing the first one.
-- Polyvaricon limitations.
-- Varactor limitations
-- Variable cap limitation.
MEETING THE JULIANO STABILITY CRITERIA
Understanding the F5LVG mixer
Pete goes to the dark side with an SDR receiver.
Pete's 800 Watt Amplifier gives him trouble. TRGHS.
People in the News
Cliff Stoll -- Still Passionate about Electronics
Peter Parker -- VHF/UHF By the Bay
Yardley Beers -- Early SSB with "The Black Rose"
John Kraus -- Moonbounce without the Moon.
MAILBAG
Posts
Bill
ReplyDeleteI listened to your latest podcast, particularly the part about our exchange on the mixer topology. What you failed to mention was that the schematic as originally posted had a flaw and couldn`t have worked - either in LTSPICE or in practice. There was no current path to ground for the LO to produce switching current in the diodss. It turns out you had a capacitor from the mixer to ground in your actual circuit that allowed it to work, not shown in the blog schematic. I spotted this, modeled it in LTSPICE and contacted you. After you looked at your actual circuit, you confirmed I was correct and added the cap.
Joe
Right you are Joe. It needed that cap. Thanks, 73 Bill
DeleteThis comment has been removed by the author.
ReplyDeleteWhat was the name of that pcb material supplier tha Pete mentioned in the last podcast?
ReplyDeleteabcfab
Deletehttp://stores.ebay.com/PCB-Laminates-Copper-Clad?_trksid=p2047675.l2563
Dale K9NN
yes abcfab.
ReplyDeleteJust wanted to comment that I am available to play Santa for special Christmas events and also provide music for weddings and Bar Mitzvahs.
ReplyDeleteBeing retired I need to supplement my income so I can buy Si5351's Arduino Nano's, Color TFT Displays and Teensy 3.5's.
Merry Christmas and Happy New year to all.
73's
Pete N6QW