70029Re: Peaberry SDR new firmware available
- Nov 13, 2012Congratulations David! I am seeing significantly improved performance. I measure the noise floor as follows:
7.0 MHz -142 dBm
10.0 MHz -137 dBm
14.0 MHz -131 dBm
That is 6-8 dB better than I measured before and is read with the receiver calibrated at -73 dBm on 10 MHz.
The CFGSR calibration is noted and works well. The IQ phase reversing is very ingenious and also works well.
I am not sure how to measure WSPR decode improvement except anecdotally and it decodes every trace that shows up.
All in all a great effort and we really appreciate it!
Warren Allgyer - W8TOD
--- In email@example.com, David Turnbull <dturnbull@...> wrote:
> Good Morning,
> Thanks to everyone who's supported my work on the Peaberry SDR with
> either kind words or a purchase. Radio communications has been an
> interest of mine since I was a child. It's a real pleasure to be able
> to help others build state-of-the-art experimental radios.
> I've been diligently working on improving the Peaberry SDR over the
> past months. The PSoC chip that runs this radio is an amazing device.
> In addition to a typical System-on-a-Chip, it contains a useful amount
> of blank hardware that can be synthesized with Verilog. Most of the
> improvements in this release are because of functions that have been
> moved from software to hardware.
> The new firmware includes the following:
> - Calibration is less confusing. The Si570 registers are recalculated
> when the calibration is changed.
> - I/Q channel reversing for the transmitter. See:
> - Local oscillator tunes down to 120kHz. I don't have filters
> designed for 600m and 1750m, but the radio is prepared for this.
> - More sensitivity on 20m.
> - 4kHz noise completely eliminated. This was coming from CPU
> interrupts which have been replaced with Verilog.
> - Better timing for narrow FSK protocols like MEPT_JT(WSPR) and JT65.
> I will begin using this firmware for the kits by the end of the week.
> Assuming no major problems, of course. If you have a Peaberry and
> access to a programmer, please test the 13-NOV-2012 rom and let me
> know what you think. Hex files are here:
> 73 David AE9RB
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