New HAM-radio multimode beacon

I’m a little unclear, do you mean AD9850 and/or AD9959 – I’m not familiar with the part numbers you quoted. I was however thinking of having a play with the AD9850 at some stage to add a 0 – 40 MHz signal generator to the $10 scope.

@pe1mxp

Welcome to the forum.

Ray
Silly projects: https://www.hackster.io/rayburne

@pe1mxp

I have an AD9850 and produced FM audio using it, but changing the frequency very quickly. From what I recall it works OK even on 100Mhz but very little output.

I’m not familiar with the other Tx modes you wrote about. FM and CW should work also PSK (but thats similar to FM) as the AD9850 has a phase control.

I can’t recall if the AD9850 can do AM, i.e whether there is an output level control.

PS. I have a UK ham license in perpetuity (G4KYF) but as I no longer live in the UK I am not active

pe1mxp wrote:Hi all.

Since a year I have a HAM-radio beacon running in the 4m amateurband.
I did this with the populair AD8950 and an Atmega (ofcourse a 28Mhz-70Mhz
transverter with PA too). The Idea I got from the OZ7IGY beacon (google it).
But one mode was not enough to experiment, so programmed more modes.
Now I am running CW, PI4, ISCAT-B and JT9H mode. And this is the end
of capabilities because an AD8950 in serial programming mode has his
limits. And I want to go up for 2000bd frequency hopping. Also it has very
bad inband harmonics. So decide to buy another DDS, an AD9910 with higher
sampler rate (1Ghz). Also it has parallel programming (the AD8950 does also,
but still slow and bad signal ouput). So looking for the right processor (and cheap)
I buyed a blue pill C8T6. So I have a nice project for the winter to learn and
experiment.

73 de Roelf, [email protected]

There was even an article on Hackaday yesterday about this board and/or chip : http://hackaday.com/2015/09/13/arduino- … ital-mode/

martinayotte wrote:There was even an article on Hackaday yesterday about this board and/or chip : http://hackaday.com/2015/09/13/arduino- … ital-mode/

RogerClark wrote:@pe1mxp

I have an AD9850 and produced FM audio using it, but changing the frequency very quickly. From what I recall it works OK even on 100Mhz but very little output.

I’m not familiar with the other Tx modes you wrote about. FM and CW should work also PSK (but thats similar to FM) as the AD9850 has a phase control.

I can’t recall if the AD9850 can do AM, i.e whether there is an output level control.

PS. I have a UK ham license in perpetuity (G4KYF) but as I no longer live in the UK I am not active

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

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

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

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.

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