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Tuesday, October 9, 2018

Falcon 9 Launch, Landing and Sat Deployment Video



Very cool video from Space X.  I like how they have the time-line along the bottom and the telemetry in the upper right.  This is the first time they brought a first stage back to Vandenberg AFB.  I hope we get to watch the launch of the Indian Cube-Sat in November. 

Monday, October 8, 2018

VU3XVR's EMRFD TIA HB TRANSCEIVER

VU3XVR-40m-CW-TXVR-Homebrew-5W-QRP-Transceiver

Ram did a beautiful job on this 40 meter rig.    You can read about this project here: 

https://vu3xvr.blogspot.com/2018/10/homebrew-5-watts-cw-transceiver-using.html

Sunday, October 7, 2018

Stockpiling Parts for Analog Oscillator STABILITY


Doug DeMaw taught us that a key contributor to analog oscillator stability is the use of NP0 capacitors.  As part of my effort to maintain the ability to produce analog, discrete component, coal-and-cap, chip-free oscillators, I recently went out onto the internet in search of an assortment of NP0 capacitors.  Nightfire Electronics had just what I needed.  I took their assortment and put it in a parts box for easy access.  


Saturday, October 6, 2018

Radio Astronomy Knack!



This video has so much of the kind of stuff that interests us:  roadkill antennas.  3D printers.  Arduinos.  Raspberry Pi, And of course, RADIO ASTRONOMY.   

And the Thought Emporium guys have a lot of other great project videos on their YouTube site:

https://www.youtube.com/channel/UCV5vCi3jPJdURZwAOO_FNfQ

I feel myself being pulled back into SPACE.  First there was Farhan's new satellite, now this.  Last weekend I finished a 3 element quad for 146 MHz.   In a fit of nostalgia I used the same copper tube elements that I used to communicate with the MIR space station from the Dominican Republic in 1995. They have good JuJu.  And Mojo.   TRGHS.  More on this later. Tune UP!  

Sunday, September 30, 2018

Back to Mr. Carlson's Lab



I like the Vedolyzer in the wooden box. 

Wednesday, September 26, 2018

The Triple Scratch-Built BITX Club -- Do you qualify for membership?


OK, so how many of you guys can join Steve M0KOV and me in the Triple Scratch-Built BITX Club?  

Bill 

Below are my three Bitx builds.

1st build.  
Closely follows Farhan's original 20m design but I soon changed the VFO for an arduino/ad9850.  It was a fast, get me on the air build, it worked, but not well.
The output amp was built on a separate board as part of its exorcism. 

2nd build. 
This was to be my two band Hill Topper, we don't have mountains in Yorkshire. Built with separate stages slotting into the eddystone box to save space and to help with shielding. The receiver worked very nicely, the output kept blowing irf510's. I later found that they were a hopeless batch. Very hard to work on.



3rd build. Big is beautiful. Arduino/si5351 straight into the modulator and into the mini-circuit mixer through a driver as discussed. Norton feedback RF preamp and a ne5532/lm386 AF amp. At the moment it's on 80m but it did start on 40m. It's still a work in progress and I will have to sort that soldering iron band change.

73  Steve M0KOV

Designer: Douglas Bowman | Dimodifikasi oleh Abdul Munir Original Posting Rounders 3 Column