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Author Topic: Join the Homebrew RF Design Challenge!  (Read 1138 times)
N8CBX
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Posts: 562




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« on: July 07, 2019, 04:43:10 AM »

https://www.nxp.com/products/rf/rf-power/homebrew-rf-design-challenge-2019:Homebrew-RF-Design-Challenge-PG?lang=en&lang_cd=en&

"...NXP is hosting an RF power amplifier design contest. Applicants will record a video or create an article describing their power amplifier/demo using NXP's new 50 V, 100 W MRF101AN or 300 W MRF300AN RF power LDMOS transistor. The contest is open to students, professional engineers, companies or individuals..."

Jan N8CBX
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Dayton Ohio - The Birthplace of Aviation
K6AER
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« Reply #1 on: July 09, 2019, 05:32:02 PM »

I can't see someone spending a thousand dollars for hardware and time only to break even if they win. Even with first place at $3000 and second place at $1000 plus certificate, still a lot of work.

Sneeky way to interview perspective new engineers.

Can NXP engineers also compete?
« Last Edit: July 09, 2019, 05:52:55 PM by K6AER » Logged
AC2RY
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Posts: 728




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« Reply #2 on: July 09, 2019, 08:00:03 PM »

I can't see someone spending a thousand dollars for hardware and time only to break even if they win. Even with first place at $3000 and second place at $1000 plus certificate, still a lot of work.

Sneeky way to interview perspective new engineers.

Can NXP engineers also compete?

Designer's bio and print and/or video featured on NXP's website.

This is a good way to advertise your skills to potential employer (not only NXP). Most valuable to young folks looking to differentiate from pool of lookalike job fair candidates. This is worth more than $3000 main prize money.
« Last Edit: July 09, 2019, 08:02:44 PM by AC2RY » Logged
W6RZ
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Posts: 362




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« Reply #3 on: July 10, 2019, 06:34:19 AM »

I was involved with the 2017 Rohde & Schwarz Engineering Competition. They used my open source DVB-T2 transmitter code as the basis of the competition.

The 1st place prize was also $3000. However, participation was huge with 50 teams from 30 universities. The finals were in Munich, so I'll guess that some teams not from Europe spent more than that just on airplane fares.

https://www.youtube.com/watch?v=Kj6hGD2wCy4
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K6AER
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« Reply #4 on: July 10, 2019, 09:29:58 AM »

I wonder how many budding engineers will have access to the necessary test equipment needed for this type of project.
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KD8MJR
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« Reply #5 on: July 10, 2019, 11:14:38 AM »

Nice little competition.  I wish I had the time to enter, also not sure if this will be a conflict of interest with my job.  I doubt it but in this crazy world of lawyers and contracts one never knows.

73s
Rob
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“A lie can travel half way around the world while the truth is putting on its shoes.”  (Mark Twain)
KA4WJA
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« Reply #6 on: July 10, 2019, 11:25:52 AM »

Mike,
I assume you're writing about those out of university?  And, without a lab at home?

I wonder how many budding engineers will have access to the necessary test equipment needed for this type of project.

'Cuz, as a physics major, I freely admit to not spending too much time in the EE buildings (we had a wicked 10kw open-pool research reactor in the physics building back then), but what I saw was impressive...

But...
Have university engineering labs not kept up with modern times?

I suppose that some smaller "community colleges" might not have lots of modern / digital equip?  But, I'm not sure?

Perhaps we should be looking at modernization of under-grad STEM college programs?



BTW, in the old days manufacturers would supply lots of samples to just about anyone who asked....heck I remember Moto giving away devices by the 1000's at RF Expo shows....
Do any of them still do this?


73,
John,  KA4WJA
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K6AER
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Posts: 5690




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« Reply #7 on: July 10, 2019, 05:08:56 PM »

HP paid for my last two years of collage while I was working as a field engineer for them. I had access to the Neilly Sales Group in LA and a stash of microwave test equipment then. I would bring the equipment to the university for two weeks and the professors could only dream of getting their hands on the new equipment. Many  of the techniques being taught were 10 years behind what the industry was using.

God that was a long time ago.
« Last Edit: July 10, 2019, 05:27:21 PM by K6AER » Logged
KW6LA
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Posts: 128




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« Reply #8 on: July 22, 2019, 10:09:46 PM »



God that was a long time ago.
[/quote]

Mike .. Dont make me feel so old !   Shocked
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KOP
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Posts: 345




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« Reply #9 on: July 23, 2019, 08:10:52 AM »






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I considered a microwave oven magnetron and a 4' dish as a drone-killer. The ERP would be on the order of a hundred thousand watts or so. ~anon

November 28, 2018, 09:16:04 AM
G4ZOW
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Posts: 118




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« Reply #10 on: July 24, 2019, 05:21:56 AM »

Your second image needs size reduction.

What frequency is that NXP circuit for?

David  G4ZOW/5B4
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KOP
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Posts: 345




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« Reply #11 on: July 24, 2019, 07:42:08 AM »

Yes that image got past me :-( The device needs no further resizing , it's small enough as it is :-)
The MRF101AN-START kit I received was for 27.120 MHz.
There are kits for 13.56 , 27, 40.68, 50, 81.36, 87.5-108 , 136-174, and 230MHz
https://www.nxp.com/docs/en/data-sheet/MRF101AN.pdf

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I considered a microwave oven magnetron and a 4' dish as a drone-killer. The ERP would be on the order of a hundred thousand watts or so. ~anon

November 28, 2018, 09:16:04 AM
AD5GH
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Posts: 8




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« Reply #12 on: July 27, 2019, 08:14:14 PM »

The devices seem quite easy to work with in a classic HF broadband push-pull configuration. I worked on the schematic over a weekend, did the PCB layout the following weekend, and built the unit today. Applied power, set the bias to 100mA on each device with no drive, then applied drive. With less than 0.5W drive able to produce 150W output. I stopped at 150W as it was getting late and didn't want to push it. Once I have completed testing, I will post details: www.ad5gh.com.



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AD5GH
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« Reply #13 on: July 27, 2019, 08:29:25 PM »

Here are the images...



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DL8OV
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Posts: 1051




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« Reply #14 on: July 28, 2019, 01:45:17 AM »

With so much gain (0.5W in and 150W out) I would be tempted to try some source degeneration

Peter DL8OV
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