On Sat,11/20/2010 12:48 PM, John, KI6WX wrote:
The ARRL is aware of this issue. This problem was discussed in my 1988 articles on phase noise in QST (March & April issues). The article notes that a high phase noise transmitter degrades the performance of a low phase noise receiver to that of the transmitter. This article started the ARRL making composite transmit noise measurements.
I've recently added fuel to the fire with an online document plotting ARRL TX data for multiple radios on the same graphs, making comparison's easier. I did that by taking data point by point off of ARRL's published plots, then putting them in my own spreadsheet. I did that for both keying spectra and phase noise.
Seeing that document, Bob Allison sent me the raw data for the CW keying spectra for those radios, and I've been processing and plotting that data. He was not able to provide the phase noise data in electronic form, so we're stuck with what I am able to eyeball from the published plots.
You can see an "in-progress" version at k9yc.com/TXNoise.pdf 73, Jim K9YC ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
