New HAM-radio multimode beacon

What are you developing?
pe1mxp
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Joined: Sun Sep 13, 2015 7:11 pm

Re: New HAM-radio multimode beacon

Post by pe1mxp » Fri Sep 18, 2015 7:48 pm

RogerClark wrote:
Were you that guy on YouTube, bitbanging music on the parallelport of the AD8950?
No. Whoever did that on YouTube it was not me.

I recall using the ADC on a Uno and fed the values to the AD9850, to constantly change its fequency and then listened on a normal FM radio on around 100Mhz. The signal was easily detectable and the audio seemed clean
But on my search I found the webpage https://zissisprojects.wordpress.com/category/arduino/

pe1mxp
Posts: 10
Joined: Sun Sep 13, 2015 7:11 pm

Re: New HAM-radio multimode beacon

Post by pe1mxp » Thu Feb 23, 2017 12:47 am

Well, after long time I have draw a schematic around the AD9912. Driven by an 25Mhz (x40 multiplier) or 1Ghz clock. Bitbang SPI control for different digital modes is with a STM32F103. Separated analog/digital supply with a bunch of AD151 regulators. This moment busy ( in my spare time) to design a PCB, 3rd try. Overall control (like GPS, Supply, external communications, etc) is done by an Atmega 2560.

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RogerClark
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Re: New HAM-radio multimode beacon

Post by RogerClark » Thu Feb 23, 2017 12:58 am

Interesting...

But why are you bit banging the SPI ??

Edit.

Looks like you want to transfer 40 bits

DMA SPI is probably your best option if its always 40 bits that you want to send

Not sure why you are using a F4, is it because you need maths co processor ?, as F103 can manage 36Mhz (72/2) SPI

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