BITX 20/40 Build Update #5: It is ALIVE!

I got the BITX 20/40 on the air this morning.  The receiver has been working for a week or so, but as usual it was a bit of a struggle to tame the transmitter.  I got up early this morning and started poking and probing.  I played with the driver and final coils a bit.  I had used the same trifilar toroids that I'd used in the BITX 17, but this rig didn't seem to like them. So I went with FT-50-37 bifilars -- that seemed to work better.  That IRF-510 seems to put out about seven watts on 40.  (I still need to tame the transmitter on 20).  The 40 meter signal looked great on the 'scopes (RIGOL and Tek!).  Shortly before 8 am I worked AD4SY who reported that I was filling his shack with booming audio.  Life is good.  

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Digi 'scope, Analog 'scope

Carl (M0ICR ex 2E0TEC) saved the day with my Tek 465 -- he sent the replacement HV multiplier that put the 'scope back in action.  (Ace Tek repairman Tad WA1FQO made the repair.  Tad sells Tek scopes on E-bay -- check out his products: Search for fqo63 on ebay.)

Carl notes a number of similarities between our workbenches and recent projects.  All he needs now is a Drake 2-B!

Alan Wolke said he'd be interested in my reactions to having both a digi scope and an analog scope on the bench.  I can already see areas where one might be a bit better than the other.  The Tek is better at watching a fast moving audio or SSB waveform.  But the Rigol doea all kinds of math tricks.  Check out the FFT function shown on Carl's page:  http://iqrp.net/

Bill,

I am very pleased that you finally got it working with the help of brothers from the fraternity.  Having listened to your latest Podcast I think that must be your alter ego!  I have A Tek 465, Rigol 100MHz DS1102E and have built 2 Bitx, one for 20m and the other for right bands- using a DDS VFO  (3 if you include the 80m version by Steve Drury G6ALU - look up MKARS80) ...I also have 2 copies of SSD!

My website is here:  www.iqrp.net  where you can see both scopes in my shack and images of my Bitx and my Hans Summers WSPR beacon!

I have just returned from my local radio club social meeting (the Radio Society of Harrow) and took great pleasure in listening to Soldersmoke 158 whilst driving there ... half on the way there and the other half on the way back.

Very best wishes from London (where it is cold, wet and miserable !)

72/73 de Carl M0ICR (ex 2E0TEC from Nov 13)
Our book: "SolderSmoke -- Global Adventures in Wireless Electronics" http://soldersmoke.com/book.htm Our coffee mugs, T-Shirts, bumper stickers: http://www.cafepress.com/SolderSmoke Our Book Store: http://astore.amazon.com/contracross-20

SolderSmoke Podcast #158: BITX 20/40, Farhan's "Minima", BITX Bandsweep

SolderSmoke Podcast #158 is available:

http://soldersmoke.com/soldersmoke158.mp3

January 20, 2014
MLK Day. Tough winter.  Shack heated by Heathkit.
BITX 20/40 Almost done:
Bandswitching arrangement.
VFO construction using spreadsheets.
2N2222s wired in backwards! (CBE not EBC! Who knew?)
Other amusing building errors.
Crystal filter evaluation -- the G3UUR method.
Sweeping a filter with an Arduino DDS.
Building a BITX in LTSpice.
New Rigol 'scope (now 100 MHz).
Tek 465 REBORN!
QRP HATERS -- They are out there!
MAILBAG.
BITX 20/40 dual band bandsweep

Our book: "SolderSmoke -- Global Adventures in Wireless Electronics" http://soldersmoke.com/book.htm Our coffee mugs, T-Shirts, bumper stickers: http://www.cafepress.com/SolderSmoke Our Book Store: http://astore.amazon.com/contracross-20

John Dobson (Sidewalk Astronomer, Telescope Maker) RIP

http://www.skyandtelescope.com/news/home/John-Dobson-1915ndash2014-240456881.html

Our book: "SolderSmoke -- Global Adventures in Wireless Electronics" http://soldersmoke.com/book.htm Our coffee mugs, T-Shirts, bumper stickers: http://www.cafepress.com/SolderSmoke Our Book Store: http://astore.amazon.com/contracross-20

Farhan's New Design: A General Coverage Transceiver: The Minima!

The homebrew phone QRP community has been waiting anxiously for the unveiling of Farhan's new design:  The Minima.  It is a general coverage transceiver with many innovative circuit features.  It has an Arduino in it and an Si570. Farhan's write up of the design process and the construction of the prototypes is really interesting.

http://www.phonestack.com/farhan/minima.html

I've built FOUR JBOTs and TWO BITXs.  I even built Farhan's Subway Sandwich Straw signal generator.   So even though I've been trying to keep my rigs all discrete,  I know I will build this one too. 

Three cheers for Ashhar Farhan!  Viva La Minima!

Our book: "SolderSmoke -- Global Adventures in Wireless Electronics" http://soldersmoke.com/book.htm Our coffee mugs, T-Shirts, bumper stickers: http://www.cafepress.com/SolderSmoke Our Book Store: http://astore.amazon.com/contracross-20

Words to Live By...

Our book: "SolderSmoke -- Global Adventures in Wireless Electronics" http://soldersmoke.com/book.htm Our coffee mugs, T-Shirts, bumper stickers: http://www.cafepress.com/SolderSmoke Our Book Store: http://astore.amazon.com/contracross-20

Bert's Blog and BITX

Our friend Bert is once again melting solder.  And he has launched a blog.  (SolderSmoke listeners will remember Bert as the advisor to the University of Virginia radio club.   That was the club that had its HQ in some sort of nuclear reactor building.  They put up a huge wire antenna, but then took it down when they realized bike riders could possibly, uh, run into it.)    Bert has some interesting stuff on his blog, including an article on conductive paint and one on the use of mail boxes as antenna tuner enclosures.  And he reports that he has dusted off a BITX 20 kit.  Welcome back Bert! 

Check out his blog:
http://wf7ihomebrew.wordpress.com/ 

Our book: "SolderSmoke -- Global Adventures in Wireless Electronics" http://soldersmoke.com/book.htm Our coffee mugs, T-Shirts, bumper stickers: http://www.cafepress.com/SolderSmoke Our Book Store: http://astore.amazon.com/contracross-20