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.  

http://vakits.com/about-nightfire-electronics

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!  

Back to Mr. Carlson's Lab

I like the Vedolyzer in the wooden box. 

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

Freethink YouTube Channel

Lots of really nice, inspirational videos here: 

https://www.youtube.com/channel/UConJDkGk921yT9hISzFqpzw

Farhan's Satellite

Latest news:

The launch is set for November 24, 2018 from California.  It will be in a polar orbit.  The beacon will be on 145.90 MHz.   Farhan says an RTL-SDR Dongle should do the trick.  I plan on building several receive systems and an appropriate antenna. 

https://telanganatoday.com/a-blessing-for-the-small-guys

https://www.thehindu.com/news/national/other-states/odisha-man-team-builds-private-satellite/article24963338.ece

https://www.timesnownews.com/technology-science/article/instagram-now-lets-you-shop-directly-from-stories-explore-tab-heres-how/286276

I don't think Farhan's group is connected to this group, but this short video does a nice job of explaining the potential of CubeSats.

FROM Prasad VU3YFD:

Hi my friend's information to all about a man's " A DREAM COME'S TRUE " in " VU " LAND with his hard work & to the whole team.. we can say ......FANTASTIC ..... no other words to express from my side but i ENVY on their hard work's.. hi hi .de vu3yfd,prasad

AMSAT-UK

IARU Amateur Satellite Frequency Coordination

List of Sats formally submitted

ExseedSat Updated: 10 Aug 2018 Responsible
Operator Ashar Farhan VU2ESE
Supporting Organisation Exseed Space Innovations Pvt Ltd
Contact Person afarhan@gmail.com.nospam
Headline Details: The ExseedSat is a 1U cubesat that will provide a multifunction UHF/VHF NBFM amateur communication satellite. It will have various configurable modes, including: • UHF to VHF, single channel, narrow band FM transponder with CTCSS, 67 Hz squelch • Power output selectable between 1 watt and 0.5 watt • Digipeat feature with APRS on UHF uplink nd VHF downlink • Melody mode : It will play a simple melody of a few notes on special occasions or events. This will interest students outreach. • We expect this satellite to have a life of two years, depending upon how long the battery lasts and when the satellite de-orbits naturally. Planning a SpaceX launch from Vandenberg in October 2018 **The request has now been updated to include only a U/V transponder/digipeater** **The following frequencies have been coordinated: 145.900 MHz for repeater and digipeater downlink and for telemetry and 435.340 MHz for repeater and digipeater uplink**
Application Date: 19 Jul 2018 Freq coordination completed on 10 Aug 2018

Read The Hindu story at https://www.thehindu.com/…/odisha-man-t…/article24963338.ece

IARU information http://www.amsatuk.me.uk/iaru/formal_detail.php…

Gurudatta Panda VU3GDP http://gurudattabam.blogspot.com/

Ashhar Farhan VU2ESE http://hfsignals.blogspot.com/

Tnx cu agn de vu3yfd,prasad

Pete's New Sudden Transceiver

Check it out!  Note the Juli-yellow front panel color.   Featuring FT-8 and WSPR capability.  Go Pete! 

http://n6qw.blogspot.com/2018/09/2018-year-of-ssb-transceivers_14.html

Nightfire Electronics

Some interesting items in their catalog.  I ordered their NP0 capacitor kit.   I have to stock up in order to avoid being forced into the digital oscillator morass. 

http://vakits.com/about-nightfire-electronics

They also have crystals for the ham frequencies.  

Please tell them that SolderSmoke sent you. 

WB8VGE on QSO Today -- QRP, HB, Boatanchors, Drift, Solar Power

Eric 4Z1UG has a really good interview with Mike Bryce, WB8VGE. 

Listen here: 

https://www.qsotoday.com/podcasts/WB8VGE

I've been a big fan of Mike's for many years. I've talked to him on the air a couple of times.  I liked his QRP column in 73 magazine.  I share his enthusiasm for Boatanchor rigs.  He is a fellow member of the QRP Hall of Fame (who, like Pete and me, at times seems to be pushing the QRO envelope).  I like his approach to solar power. He too has been bothered by appliance ops who complain that his boatanchor rigs are 150 hertz "too low."  

His attitude toward contesting is similar to mine -- I may be more opposed than he is.  I think contesting encourages a kind of harshness and competitiveness that runs contrary to the spirit of the Radio Amateur's code. 

I got a chuckle about Mike's claim that he almost Worked All States in RECEIVED Official Observer reports. And that he at one point owned THIRTY  104s.  

Mike's observations on the dumbing down of ham radio and on the social (psychological?) problems of 75 meters ("net starting in 5 minutes!"  "QRP not allowed on 75") are sadly on the mark. 

Mike's hint about using a white-out pen to spruce up the front panel of an old Drake radio adds a new household/office material to our rig-fixing arsenal. 

Eric's comment on the Lafayette Catalog resonated with me.  I used to read it too. 

I hope Mike decides to get on the air more frequently.  Just avoid 75 meters and 7.200 MHz Mike. 

AI and Machine Learning Detect Fast Radio Bursts

KD4PBJ's PTO "Turtle" Receiver

Gents,

Here’s my newest creation. 

It’s a PTO tuned receiver for 40 meters and uses the WA6OTP PTO circuit I built a couple years back. I believe I had sent you a picture of it then. I bought the tuning assembly from him which is the aluminum bracket, acrylic tube fitted with Pem nut, and brass screw.  The circuit uses a J310 as oscillator transistor and several bipolar transistors for amplification and buffering. 

This feeds a ADE-1 mixer, mounted on a little breakout board I bought from RfBay. 

Years ago I had good luck building the Rock Bending Receiver from the ARRL handbook, so I took the audio chain from it and incorporated it. It uses a TL072 and a LM 386. 

As of now I haven’t needed any kind of front end filter, but am working on a 40 meter bandpass filter from Hans Summers that I will put on the input just in case it’s ever needed. 

I had been looking for an easy enclosure and found this in one of the break rooms at work. An empty Christmas nut tin. 

The PTO screw goes in and out like a turtle sticking its head out of the shell, plus my 13 year old son Alex’s favorite animal is a turtle. So it goes. 

Chris 

KD4PBJ

N2CQR Wins a Contest AGAIN!

Pete N6QW suggested I do a blog post on this.  

This past weekend I dusted off my old scratch-built, all-analog, no-chips BITX20. (THREE CHEERS FOR FARHAN AND HIS BITX DESIGN!)   I hooked it up to my trusty CCI .1KW (note decimal point) amplifier and my new 135 foot store-bought doublet.  This all happened just as the Worked All Europe  DX contest was kicking off, with lots of activity on 20.   TRGHS.  I was in.  My contest operating style was in the category of "relaxed-casual-noncompetitive." I took a lot of breaks.  In fact there were more breaks than non-breaks. You have to pace yourself in the contest world.  

My results: 

8 SEPT: DF0HQ, SN7D, GM6X, DP6A, S51A, DL0HN, DB0HX, OZ5E, DJ5MW, HG7T, IK4UPB, VY2ZM, G6XX, EF1A, LZ5R, 9A5W, YP0C, F6HQP, DL7ON, HB9DQL, ON6NL, DA0WRTC,  9 SEPT: EI7M, P3X, RU1A, DP7D, SP2KPD, DL0WW.

P3X might not count because, you see, Cyprus is considered to be in ASIA.  Really? 

Anyway, I 'm assuming that I am the winner in the homebrew, discrete component , all-analog transceiver category.  Woo Hoo!  

The contest rig is pictured above.  Before you point to the glowing numerals and cry foul, realize that the little Altoids box between the two speakers holds a San Jian frequency counter that was deliberately kept OUTSIDE the BITX box.  So it is more of an outboard accessory.  I can run the BITX 20 without the digital assist -- I have an old fashioned non-digital dial pointer to indicate frequency.  The "Low - High" switch you see switches the VFO from the low portion of the 20 meter phone band to the higher part of the band.   The box below the BITX 20 holds the uBITX. 

Seriously though, I was quite pleased with the performance of the doublet.