[RFI] Noisy transmitters...somewhat long...

Jim Brown jim at audiosystemsgroup.com
Tue Sep 23 21:01:09 EDT 2014

On Tue,9/23/2014 10:26 AM, Kenneth G. Gordon wrote:
> I need some advice and information which will either corroborate or
> its opposite my contention that modern transmitters output broadband hash,
> and that SDR transmitters are worse in this regard.

About a month ago, I put together this document addressing exactly that 
question, and some others. It plots the published results of ARRL Lab 
testing of selected transceivers on the same graphs, thus allowing easy 
comparison of the data. The older Flex rigs are pretty bad for phase 
noise, but decent for keying bandwidth. The worst of the worst for 
keying bandwidth is Yaesu, with Icom a distant second. Note that all of 
these measurements were by ARRL -- only the analysis is mine.


73, Jim K9YC

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