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pavel-demin / red-pitaya-notes

Notes on the Red Pitaya Open Source Instrument
http://pavel-demin.github.io/red-pitaya-notes/
MIT License
337 stars 209 forks source link

sdr_transceiver_hpsdr question #655

Closed davidhay45 closed 6 years ago

davidhay45 commented 6 years ago

Can anyone tell me what transmit power is produced by the RedPitaya running sdr_tranceiver_hpsdr and to what extent this is controlled by PowerSDR mRx PS running under Win10. Someone told me this is 10mW, is this correct?

Thanks

pavel-demin commented 6 years ago

Depending on settings, the output voltage can be as high as 2.0-2.2 Vpp over a 50 Ohm load. It corresponds to 10-12 mW. The output voltage is controlled by Drive and by Settings->PA Settings->PA Gain.

davidhay45 commented 6 years ago

I am considering a RF amp that has an input range of up to 2.5mw. Would it be sensible to use the settings to limit the power so much or should I use an attenuator?

Thanks

pavel-demin commented 6 years ago

I heard that the output opamps on the Red Pitaya board performed better when the output voltage was around 1 Vpp. So, I think that it should be OK to limit the output power using the settings in PowerSDR mRX PS.

ka6s commented 6 years ago

David,

I had luck with the class B amplifier design used in the HPSDR Penelope transmitter. It is simple to understand - just Resistor Ratios setting the gain. You can find the schematics through the openHPSDR.org website.

Steve

On Thu, Dec 14, 2017 at 11:08 AM, Pavel Demin notifications@github.com wrote:

I heard that the output opamps on the Red Pitaya board performed better when the output voltage was around 1 Vpp. So, I think that it should be OK to limit the output power using the settings in PowerSDR mRX PS.

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