Thanks.. I did search again.. tough to dig anything out of the searches here
I am interested in this project too. Maybe Gene will write an article about it someday.
You may find this helpful: eHam Forums / Software Defined Radio / RE: QS1R Receiver can now transmit (QS1E available) on: September 01, 2012, 05:12:48 AM
Quote from: ZENKI on August 31, 2012, 05:24:17 PM
Where did you buy the PCB boards for the project from? Its a shame that the ARRL chose to release the project PCB files in a propriety PCB format. Gerber files could have been used anywhere in the world. Besides
all PCB packages can import Gerber files. Its a real expensive nuisance having PCB boards manufactured in the USA when I could have had them milled or produced locally for a cheaper price.
I did my own PCB (photo etch) that integrates the 2x VRF151 stage, the 2x VRF148 driver stage, and the pre-driver stage onto a single PCB. With the pre-driver, I needed to take the 0 dBm output of the exciter up to a level that would drive the 2x VRF148 stage. I went back and carefully adjusted the biases and took measurements again. Worst case IMD is about -43 dB now. I used FreePCB software to lay out the PCB http://www.freepcb.com/