[hpsdr] RP board design

[dan edwards]

wow, Steve, super job!


      From: Steven Wilson <wevets at gmail.com>
 To: hpsdr at lists.openhpsdr.org 
 Sent: Friday, October 28, 2016 6:08 AM
 Subject: [hpsdr] RP board design
   
Helmut, and Terry,

I've been working on a Homebrew RP transceiver design for most of this year. I'm on the 4th iteration of the board.

Today I also took my first stab at creating a github repository.  You'll find the Kicad schematics and gerbers for the board there:

https://github.com/ka6s/rp_adapter

The board is based heavily on work done by OpenHPSDR.  I've incorporated the LPU, T/R relay and 1W PA design from Penelope into the board. (Note - any layout issues etc are mine as these are complete re-layouts).  The board has an 18db-ish LNA incorporated into it along with control for an external RX/TX filter.  It is BUILT to match up with the cabling required by the EB104.ru HERMES RX filter, and their 300W LPF board.  The boards are about $100ish US each -so the price is right. 

I'm using a Raspberry Pi 3 + LCD to provide a GUI control of the unit running John Melton, G0ORX's PiHPSDR code. Here is a video of the basic unit if you want to see what I've put together.

https://www.facebook.com/dontwantemailhere/videos/vb.1345107848/10210568670396717/?type=2&theater

I have been having a BLAST working on this.  It has been frustrating and rewarding at the same time ;-)  

One thing I'll mention that you can't see in the video - there is a 9:1 UnUn between the LNA and the RP. This is a MUST.  It is a practical solution to the RPs high input impedance. 

Hope you find it interesting.

73 de Steve KA6S

(and many many many thanks to Phil, John Melton, and all the others that have put the OpenHPSDR systems together!)

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