Earlier this week I shocked Pete Juliano by telling him that I was taking a break from my normal analog, discrete component, no-chips mode of construction so that I could put together a Raspberry Pi-based SDR receiver. Even from 3000 miles away, his astonishment was clearly perceptible. He seemed briefly disoriented by it. I’m sure some of you may have a similar reaction.
I’d been lured in by that video of the Raspberry Pi RTL-SDR receiver with the very cool touch screen display. It has a waterfall! And a touch screen! How could I resist?
I went to Amazon, but there I discovered that that attractive display is not exactly cheap. And maybe I’d need a new Raspberry Pi. At this point, in search of economy and convenience, I began rummaging through my digital junk box. There I found a Rasp Pi Model B. And an old computer monitor. This will be easy, I thought. Just get some SDR code into that Pi, hook up the RTL-SDR dongle and Bob’s my uncle, right?
Not so fast. I quickly began to run into daunting digital obstacles. Sure, the Raspberry Pi fired right up and filled the computer display with lines of code. But it was all Linux. Yuck. Sorry Linux fans, but for some of us mere mortals, Linux is a weird opaque world in which every little thing is somehow a lot harder.
I also began to suspect that my 2013 Model B might be sort of a Model T in the Rasp Pi world. It might not be up to the computing task.
And finally, as I poked around the internet, I began to conclude that the Raspberry Pi software for SDR is not quite done yet. All the sites seemed to have the word “experimental” in there. And lots of “I’m pulling my hair out” comments Maybe I’m wrong, but maybe we just need to give this more time.
Let me ask the distinguished group some questions:
Is my Model B really useless for SDR purposes, even if I don’t need all the bells and whistles?
Is there an SDR program that can be easily placed in a Raspberry Pi by someone who has NOT mastered the mysteries of Linux?
For now, I have cleared the raspberries from the bench and am back to working on HDR stuff.
Category: Raspberry Pi
Falling for the SDR Waterfall…
This is going against everything I believe in, but I admit it — I want one of these.
A 12AU7 Atop a Raspberry Pi
http://makezine.com/2016/05/06/warm-tube-tone-is-just-what-the-raspberry-pi-has-always-been-missing/
I don’t know what to say. One moment I find myself thinking that this could represent “the best of both worlds.” A minute later I’m thinking that this thing is a horrible chimera. And it has a whiff of audio fool-ism about it, don’t you think? Will it work better with oxygen-free cables and gold-plated fuses?
Still, overall — pretty cool.
Soldersmoke Podcast #186 Is Available — April 1 Rap Up, Pi Talk from Pete, Collins and Raspberries, Bill’s Analog RX, Visits and Hamfests, MAILBAG
A Major Change For SolderSmoke: Introducing the WireWrapRap Podcast!
QRPi WSPR with a Raspberry Pi Shield from Hungary via Tuscon
SolderSmoke Podcast #183 Pete’s B’day, Simple-Ceivers, Binaural Bliss, 160 or Bust, GOOD BEHAVIOR, MAILBAG
SolderSmoke Podcast #183 is available. And it is GOOD!
http://soldersmoke.com/soldersmoke183.mp3
20 December 2015
— Foxes in the Backyard
— Pete completes another orbit
— Simple-ceiver Success!
— Frankenstein Receiver: IT IS ALIVE! AND BINAURAL!!!
— 160 Meter AM OR BUST!
— Fun on 40 AM — Lots of Multi Elmac AF-67s! Who knew!
— The Amateur’s Code, and violations thereof.
— Negative Frequencies? I don’t think so.
— Capacitor Offer from our Secret Benefactor: EXPANDED ELIGIBILITY
— Projects for 2016: Pete goes Raspberry Pi, Bill goes DX-100
Mailbag:
— Croation Creation
— Salvadoran 2B
— N3FJZ’s Homebrew QSL
— WA7HRG’s LBS-ZIA-Simple-Ceiver Mashup Rig
— KC0IZR turning VCRs into Mighty Mites in NOVA
— AB1YK Starting with DC RX, going BITX
— G8GNR puts Mighty Mite on AM!
— G3ZPF Modulates THE SUN (Amazing)
— VK3YE’s Simple Superhet
— Grayson in Turkey drools over KG7TR’s Octalmania
— N7REP reaches for the Zantac because of Arduinos and Surface Mount
SolderSmoke Podcast 182: Bears! MMM Update, On Pete’s Bench, 160 AM Dreams, MAILBAG
Nightmare Turns Real: “Rig Here is a Raspberry Pi OM, and I’m listening to you with my Dongle…”

Adventures with Small Computers
I’ve succumbed to the lure of the tiny computers and microprocessors. This weekend I was playing with the Arduino that I bought (supposedly) for Billy. You see, I have a little microprocessor-based keyer in my ten meter beacon rig (Demaw’s “Lil’Slugger”) . It works fine once you get the desired Morse sequence into it, but getting that done is difficult and frustrating for someone (like me) unaccustomed to an iambic keyer. So I was thinking that this would be easier just to replace the keyer with an Arduino. I was right. With some help and advice from Billy, I got the Arduino going, and got the little LED blinking. Then I took some code from Mark K6HX, modified it for my call-sign, and loaded it into the Arduino. No problem at all. Kind of fun. And it opens your eyes to all the possible applications of this little board.
Unfortunately, in the course of fooling around with the interface between the board and my rig I think I did damage to my Arduino. I managed to blow out the blinking (pin 13) LED on the board. I could live without that, but now the ICs get very hot (especially the little surface mount chip just below the 16 MHz crystal). Anyone hope of fixing this? (I’ve already ordered a replacement board, but I feel guilty about this.)
Here’s a good article describing the pros and cons of Arduino, Raspberry Pi and Beagle Bone:
http://blog.makezine.com/2013/04/15/arduino-uno-vs-beaglebone-vs-raspberry-pi/
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
Wow! Raspberry Pi as an RF Transmitter

https://github.com/threeme3/WsprryPi
This site shows you how to use a $35 Raspberry Pi Computer as an RF transmitter for the WSPR (Weak Signal Propagation Reporting) System. All you need is a simple low pass filter and an antenna. (Oh yea, and a ham radio license.) The site says you can get 10 milliwatts out. That’s enough for WSPR! Very cool.
This looks like a real international effort:
For more info on WSPR: http://soldersmoke.blogspot.com/search/label/WSPR
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
The Raspberry e-Bay Multi-Mode Beacon of M0XPD
From: Paul Darlington
Subject: Multi-mode QRSS beacon on the Raspberry Pi
To: “Bill Meara”
Date: Sunday, January 20, 2013, 8:32 AM
http://m0xpd.blogspot.co.uk/2013/01/multi-mode-beacon-on-rpi.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
Move over Altoids Tins! Legos for Raspberry Pi Case
Too bad the Raspberry Pi board is a bit too big for our beloved Altoids tins. It would have been a very fitting match: British board in a British box. A twelve year-old has solved the problem with Legos: http://blog.makezine.com/2012/06/11/lego-raspberry-pi-enclosure/
Will this lead to raids on the toy boxes of the grandchildren of SolderSmoke fans?
Billy’s RasPi is running nicely (but no Legos for him).
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



