Speech!

General discussion and support for the Peaberry SDR V2.

Speech!

Postby hansvi » Thu May 02, 2013 2:52 am

So, you release a second version of the peaberry, and you just upload the new support files and that's it? I don't think so!

Speech!
Speech!
Speech!
73,
Hans - ON8VQ
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Re: Speech!

Postby AE9RB » Sat May 04, 2013 12:14 am

Some of the changes from V1:

  • Diagnostic and status LED
  • Works great up to 10m band (30MHz)
  • Eliminated external LPF
  • Up to four bands instead of three
  • Improved sensitivity
  • Improved dynamic range
  • Improved selectivity
  • Double balanced receiver
  • Support for Elecraft T1 automatic antenna tuner
  • Isolated trigger for external amp
  • USB bootloader for firmware upgrades
  • PPTC fuse protection
  • Room for two more BS170s to support QRO experiments
  • Illustrated manual using HDSDR for testing
The MIC and SPKR jacks have been eliminated from the design. Use the ones on your computer now.
73 David AE9RB
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Re: Speech!

Postby CT1IQI » Sat May 04, 2013 7:33 am

suggestions for V2.x :
1. adding test pads on places that systematically allow to assert proper operation of the main functions. The little ground loop of V1 is handy but a probe needs landing somewhere and e.g. ssop pins are not exactly friendly in that respect.
2. test prescription with waveforms etc. on those test places and some measurement data on the emission spectrum that can be expected (am currently not sure whether the noisy spectrum around a CW carrier is normal or just o deficiency of my unit.
3. not a miniature but regular debug header
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Re: Speech!

Postby CT1IQI » Sat May 04, 2013 3:12 pm

@AE9RB
Can some of the improvements made in V2 be retrofitted to V1 ?
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Re: Speech!

Postby AE9RB » Sat May 04, 2013 5:21 pm

CT1IQI wrote:3. not a miniature but regular debug header

This would make it incompatible with the Cypress tools.

CT1IQI wrote:Can some of the improvements made in V2 be retrofitted to V1 ?

Sorry, no, but feel free to have a go at it if you think otherwise.
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Re: Speech!

Postby CT1IQI » Sat May 04, 2013 7:34 pm

is there any other use for this kind of 2x5 header with 50 mil pitch? Have not seen it in the PC realm but that does not mean it does not exist.
For now have soldered a 5 lead regular flat cable, that has 50 mil pitch, to the smd contacts of the header and put a bit of plastic glue on it.
But finding the proper cable somewhere would be tidier.

On retrofitting V1:
I noticed, apart from the balanced input mixer, also a simplified tx/rx switch with a switching signal on the gate that got better decoupling.
Is there a positive effect to be expected if I retrofit that ?
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Re: Speech!

Postby AE9RB » Sat May 04, 2013 8:57 pm

CT1IQI wrote:is there any other use for this kind of 2x5 header with 50 mil pitch? Have not seen it in the PC realm but that does not mean it does not exist.
For now have soldered a 5 lead regular flat cable, that has 50 mil pitch, to the smd contacts of the header and put a bit of plastic glue on it.
But finding the proper cable somewhere would be tidier.

This is the standard "Cortex Debug Connector". Cables and connectors are readily available from anywhere that sells ARM chips.

CT1IQI wrote:On retrofitting V1:
I noticed, apart from the balanced input mixer, also a simplified tx/rx switch with a switching signal on the gate that got better decoupling.
Is there a positive effect to be expected if I retrofit that ?

No.
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