QRP Service Monitor Design

8/27/2019

Mark “Smitty” Smith KR6ZY returns to debrief us on Amateur Radio at DEFCON 27. He also unveils the winner of his project pole, the QRP Service Monitor and deep dives on his design vision for the project.

PERMALINK - https://www.HamRadioWorkbench.com/podcast/QRP-Service-Monitor-Design

Our Website - http://www.hamradioworkbench.com/
Follow us on Twitter - https://twitter.com/hamworkbench
Contact us for feedback and ideas - http://hamradioworkbench.com/contact
Connect with us on Facebook - https://www.facebook.com/groups/hamradioworkbench/
BrandMeister Talkgroup 31075 - https://hose.brandmeister.network/group/31075/

Save $100 on the Digilent Analog Discovery 2 Package by using code “HamRadioWorkbench2019” in your cart prior to checkout - https://store.digilentinc.com/ham-radio-workbench-bundle/

Cale K4CDN’s Fundraiser - https://www.gofundme.com/help-the-nelson-family-as-carla-beats-cancer

Star Wars Galaxy’s Edge at Disneyland - https://disneyland.disney.go.com/destinations/disneyland/star-wars-galaxys-edge/

Droid Depot - https://disneyland.disney.go.com/shops/disneyland/droid-depot/

Star Wars Rebels - https://www.imdb.com/title/tt2930604/

Chopper Droid - https://starwarsfans.fandom.com/wiki/Chopper

Here's What Happens When an 18 Year Old Buys a Mainframe - https://www.youtube.com/watch?v=45X4VP8CGtk

BayNet Club survey - http://www.bay-net.org/survey.html

Raspberry Pi Airplay Streaming Host - https://thepi.io/how-to-set-up-a-raspberry-pi-airplay-receiver/
https://www.hackster.io/opcode/apple-airplay-on-raspberry-pi-in-7-easy-steps-c7ff40
https://9to5toys.com/2019/01/03/raspberry-pi-airplay-receiver-setup/

Shairport-sync - https://github.com/mikebrady/shairport-sync

DIY Synth Guy Introduction to Op Amp Video - https://www.youtube.com/watch?v=yQlSs3PObyY

Teensy 4.0 - https://www.pjrc.com/store/teensy40.html

HiFiBerry Raspberry Pi DACs and Amps - https://www.hifiberry.com/

Pimoroni pHATDAC for Raspberry Pi - https://shop.pimoroni.com/products/phat-dac

DEFCON - https://www.defcon.org/

What is DefCon? - https://www.youtube.com/watch?v=3ctQOmjQyYg

Open Research Institute, Phase 4 Ground Station - https://openresearch.institute/2019/05/11/phase-4-ground-video-report-10-may-2019/

Smitty talking about microcontrollers at DefCon 21 - https://www.youtube.com/watch?v=kiMdhnXuG58

Oral History of the movie Hackers - https://www.slashfilm.com/hackers-oral-history/

BadgeLife Documentary - https://www.youtube.com/watch?v=G2fHKRONc6U

Smitty’s Design notes on the QRP Service Monitor - https://docs.google.com/document/d/1AvHzDoBxXDUolqx6FsBMn076Gl0RjaEZqFqrANyeqWs/edit#heading=h.4zi320kpso8n

10 Comments

Dr. Frank M. Howell link

8/27/2019 16:55:18

Ooh! A great episode with one member of a shadowy cabal.....LOL!

Mark Smith

11/23/2019 12:19:03

It’s not all that shadowy, they have a web page. :-)

Brian Smithson

8/28/2019 11:12:49

LOVE the idea of the "contest audio" project - I even talked to Bob Heil about something like that a few years ago. Go for it!!

73

-Brian n8wrl

Brant Marsac

8/31/2019 17:00:52

I don't like it when you have that guy on. His general demeanor is extremely condescending.

Mark Smith

11/23/2019 12:21:12

How so? I’m genuinely interested in more details. I don’t intend to be, so if I come across as demeaning, I’d like to know how to be better.

Dale Hammer K9NN

9/13/2019 09:53:42

I really enjoy it when you have Smitty join the podcast. In contrast to the above comment, I do not find his demeanor condescending in the slightest. Please continue having his expertise available. Thanks. 73

Troy

9/27/2019 15:43:23

Love Smitty. Would something like this work for the dual freq generator for receiver tests? https://www.analog.com/media/en/technical-documentation/data-sheets/AD9850.pdf

Mark Smith

11/23/2019 12:23:47

The AD chip is a good one. IIRC, it even has sine wave outputs. IR sine-ish. It’s on the list of chips to look at for this project. I’m still working on the Tx and Digital side so haven’t begun work on the Rx testing parts yet, other than to make sure I can add them to what I’m making now.

Hamiton Carter link

12/10/2022 08:46:12

So, this podcast! It's so cool :)
I now understand, at least a little bit more, why it's diffiult to meausre QRPp power. (By the way, I blundered over here to the podcast today through the github QRP service monittor project.)
I used logarithmic amplifiers in my EE thesis, and it's really fun to see them come up again here. Thanks!

Hamilton KD0FNR link

12/27/2022 08:33:57

It took a few weeks, but I finally found the logarithmic amplifier of my past. The reference was buried in a briefcase stored in a storage unit in Las Cruces, NM for the better part of a decade. (really)
I used the AD 640 for a beam position monitor processing circuit at the Los Alamos Proton Storage Ring. The idea was to compare the relative RF power, (the proton beam was circulating the pipe at 200 MHz... I think) picked up by electrodes on either side of the accelerator chamber (a 8" or so diameter circular pipe). The AD 640 was used because the current outputs from the amplifiers (one for eaither electrode) could be easily summed into a resistor. The resultting voltage gave an inidcation of how far the proton beam was off center. Cool stuff! Thanks again for this great podcast!

Ham Radio Workbench Podcast Episodes

QRP Service Monitor Design

Leave a Reply.

Subscribe

Archives

Categories