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greatscottgadgets / hackrf

low cost software radio platform
https://greatscottgadgets.com/hackrf/
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OperaCake PCBA #568

Closed matthiasben1 closed 5 years ago

matthiasben1 commented 5 years ago

Hello,

I'd like to make my own operacake board. However, I need some help.

My initial thought was to use the PCBA service provided by Seeed Studios. I've upload a BOM and the Gerbers, however I am not certain as to the PCB material selection.

  1. You have recommended using FR408, but SeeedStudios let me choose between: FR4 TG130, FR4 TG170, and also something they call "High Frequency Board" which is able to carry over 1GHz signal. Which one is appropriate, if any?

  2. You have specified 0.5oz internal copper (which conforms to the OSH Park specifications). Seeed will only let me choose between 1oz and higher (one value for all 4 layers?). Is this a problem in your opinion?

  3. Alternatively, do you know any good PCBA manufacturer for small scale production ("maker" style), which will produce a working operacake board?

mossmann commented 5 years ago

We expect to be shipping fully assembled and tested Opera Cakes by March 2019, so perhaps that will meet your need. If not. . .

The "High Frequency Board" is probably your best bet, but you would need to get stack-up details and use a microstrip impedance calculator to find out if you need to adjust the RF trace width to achieve 50 ohm impedance.

The two biggest problems you are likely to have with a prototype assembly service for Opera Cake are characteristic impedance of the RF traces on the PCB and lack of testing. You'll be on your own to test the board (and likely correct errors you find), so you may be better off doing the assembly yourself anyway.

matthiasben1 commented 5 years ago

Thank you very much for the detailed answer! Looking forward for an official board.

matthiasben1 commented 5 years ago

Hi!

 

Just out of curiosity, why was this issue deleted from github?

 

Also, is there a possibility to pre-order Opera Cake boards? Is there an estimated pricing?

 

Thanks,

 

-M

 

Sent: Thursday, December 27, 2018 at 5:15 PM From: "Michael Ossmann" notifications@github.com To: mossmann/hackrf hackrf@noreply.github.com Cc: matthiasben1 matthias_ben@mail.com, Author author@noreply.github.com Subject: Re: [mossmann/hackrf] OperaCake PCBA (#568)

We expect to be shipping fully assembled and tested Opera Cakes by March 2019, so perhaps that will meet your need. If not. . .

The "High Frequency Board" is probably your best bet, but you would need to get stack-up details and use a microstrip impedance calculator to find out if you need to adjust the RF trace width to achieve 50 ohm impedance.

The two biggest problems you are likely to have with a prototype assembly service for Opera Cake are characteristic impedance of the RF traces on the PCB and lack of testing. You'll be on your own to test the board (and likely correct errors you find), so you may be better off doing the assembly yourself anyway.

— You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub, or mute the thread.

dominicgs commented 5 years ago

On Sun, 13 Jan 2019 at 05:00, matthiasben1 notifications@github.com wrote:

Just out of curiosity, why was this issue deleted from github?

It was closed, so it doesn't show up in the open issues list. It's still here: https://github.com/mossmann/hackrf/issues/568

Also, is there a possibility to pre-order Opera Cake boards? Is there an estimated pricing?

There is not currently an estimated price and no reseller is taking pre-orders at this time.

Sent: Thursday, December 27, 2018 at 5:15 PM From: "Michael Ossmann" notifications@github.com To: mossmann/hackrf hackrf@noreply.github.com Cc: matthiasben1 matthias_ben@mail.com, Author < author@noreply.github.com> Subject: Re: [mossmann/hackrf] OperaCake PCBA (#568)

We expect to be shipping fully assembled and tested Opera Cakes by March 2019, so perhaps that will meet your need. If not. . .

The "High Frequency Board" is probably your best bet, but you would need to get stack-up details and use a microstrip impedance calculator to find out if you need to adjust the RF trace width to achieve 50 ohm impedance.

The two biggest problems you are likely to have with a prototype assembly service for Opera Cake are characteristic impedance of the RF traces on the PCB and lack of testing. You'll be on your own to test the board (and likely correct errors you find), so you may be better off doing the assembly yourself anyway.

— You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub, or mute the thread.

— You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub, or mute the thread.

markteo commented 5 years ago

Where can i order an Opera Cake?

If anyone could reply this ASAP :)