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Saturday, November 4, 2017

Termination Insensitive Amp Boards from VU3ZMV -- Eagle Files

Bill: 

Here are the eagle file data for the TIA, that I love to use as incorporated in Farhan's ubitx.

The TIA , I tried to realise two such on a double sided pcb measuring less than an inch.
 It mounts one TIA on each side.  I suppose one could simply homebrew.
It has provision for 5 pin berg (male right angle) and would be easy to plug into the main board. We may not need PTH except the connector. We can use bare pins soldering on either side.
Here are the eagle files I created.

Sarma's TIA Board

Sarma's TIA schematic

regards
Sarma
 vu3zmv

The Ham-Radio Thermatron Roots of Silicon Valley


Hack-A-Day had an excellent piece on tubes and Silicon Valley this week.  Makes me want to get the book "Secret History of Silicon Valley." 

https://hackaday.com/2017/11/02/silicon-valley-was-built-on-tubes-of-glass/ 

Note above the Klystron prototype mounted on a wooden board.   These guys clearly had THE KNACK. 

Friday, November 3, 2017

Another Source for BITX Amp Boards - AG4ZP


Thanks for sharing (the infor on the modular BITX boards). I actually had a similar idea a number of years ago and designed a small PCB for the ubiquitous BITX amplifier design. I have the project shared on OSH Park and you can get three of them shipped for $5.

The project is shared here.
73,
Ryan AG4ZP


https://oshpark.com/shared_projects/6mnfQQ6e

Tuesday, October 31, 2017

Cliff Stoll on Software, Snake Oil, and the Creation of Real Things


"I guess today's experimenters build things in software, without ever touching a soldering iron. The hocus pocus is inside the program.  It's cleaner this way -- nothing to burn or zap, and you don't need a voltmeter... What happened to home-brewed and breadboarded circuitry? Where's the joy of mechanics and electricity, the creation of real things?  Who are the tinkerers with a lust for electronics?"   

From "Silicon Snake Oil"  1995 by Cliff Stoll  

Monday, October 30, 2017

Modular BITX Boards

Sunday, October 29, 2017

Ron Gang, 4X1MK on "QSO Today" Podcast: Knack Story, Satellites, Quads, Philosophy


Wow, Eric Guth's interview with Ron Gang 4X1MK really resonated with me: 

-- Asked about how he got is start in radio, Ron went back further than many of us do in response to this question.  He cited his early experiments with "two tin cans and a string." Yes, of course!  I'd forgotten all about it, but in retrospect this might have been a very early indication of THE KNACK.  (I'll bet many of our readers were also active on the String and Can band.) 

-- Ron used a DX-100.  FB. 

-- Ron was active on the satellites.  In his voice you can hear the joy and the burst of enthusiasm that resulted from those early satellite contacts.  He also mentions the untimely demise of Oscar 13.  Bummer. 

-- Ron was the Israel correspondent for 73 Magazine.  I held a similar position in Dominican Republic.  My friend David Cowhig was at the same time correspondent from Okinawa, Japan.  We should have a reunion of "73 Magazine Hambassadors."

-- Ron mentions John Tait EI7BA.  John was a regular contact of mine when I was in the Azores.  He appears in the SolderSmoke book.  He was the one who introduced me to an important Irish accolade:  John told me that WD-40 is "the Pope's pee." 

-- Toward the end, Ron discusses the wonder of ham radio conversations, and provides a good suggestion on how to get beyond the all-to-common "hello-59-goodbye" contacts. 

Ron's comments on the spiritual or philosophical aspects of the hobby were just the thing for a quiet Sunday morning. 

Thanks to Eric and to Ron for a great interview.   
    
Listen here: 

http://www.qsotoday.com/podcasts/4X1MK

Saturday, October 28, 2017

BITX40 Featured in "Nuts and Volts"


Congratulations to Steve Jackson and to "Nuts and Volts" for putting out a very nice article on the BITX40 transceiver.   Steve did a great job in describing the origins of the BITX, and in explaining that Farhan's intent is to encourage experimentation and tinkering.  Pete and I had pitched a similar article to a major ham radio magazine  but sadly they were not interested.  Three cheers for "Nuts and Volts."  I'm thinking about subscribing. 

I know many of you will wince when you see Steve's unshielded mic cord lying right next to the front panel antenna connector, but please don't freak out about this -- in the article you will see that Steve acknowledges that the antenna connector would have been better placed on the back of the box.  That's an example of the educational value of the BITX40 -- live and learn.  Even with the connector like this, Steve was making many contacts. 

The "Nuts and Volts" website very kindly let me read the entire article without a subscription. 

Try here and click on the blue "digital edition" box: 

http://www.nutsvolts.com/magazine/article/meet-the-bitx40-a-single-sideband-transceiver

Or try going directly here:

http://nutsvolts.texterity.com/nutsvolts/201711/?folio=36&pg=36#pg36
Designer: Douglas Bowman | Dimodifikasi oleh Abdul Munir Original Posting Rounders 3 Column