On 5/22/2018 11:26 AM, Wayne Burdick wrote:
The P3 panadapter, meanwhile, is actually a direct-sampling SDR, with its own DSP. It taps off the 1st IF, which is protected by the K3’s marrow RF band-pass filters. The P3’s noise floor is extremely low because it is also preceded by the K3’s preamp, LNA, and low-loss mixer.
Yes. AND in the hands of a knowledgeable engineer/technician, a near lab-quality test instrument, with a display that can easily be calibrated to the signal level at the antenna input. I've used it to measure occupied bandwidth of transmitted signals to precision of a few Hz, and the SVGA board, with it's separate, higher res FFT, improves that to one Hz. I own two other dedicated spectrum analyzers -- an HP 8657A and a Rigol. They are not capable of these measurements, because they lack the frequency resolution (by a factor of about 500:1).
Many other modern SDRs also have this capability when used with suitable software.
73, Jim K9YC ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
