A small point; the lowest carrier frequency is 153 kHz. Sidebands extend
down to 148 kHz. All the European LF and MF broadcasting carrier
frequencies are multiples of 9 kHz.
Best wishes
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2019-08-12 22:21, Brent DeWitt wrote:
For the upper end; conducted measurements end where radiated emissions
start. Back in the mists of time someone decided that a ten meter
wavelength was something that could radiated fairly efficiently from
cables, so radiated emissions sounded like more of a risk to
telecommunications.
The 150 kHz number is more directly related to licensed services. The
limit was 450 kHz in the US until harmonization with the European
measurements. The US limit was based on protection of the AM
broadcast band. The European Longwave AM band extends down to 148kHz,
so I assume they simply rounded up to 150 kHz.
From a practical standpoint, if you stick with a 50 uH LISN, it starts
to deviate from 50 ohms quite a bit as you go lower.
Hope that helps.
Respectfully,
Brent DeWitt, AB1LF
On 8/12/2019 4:36 PM, 000006cee064502d-dmarc-requ...@ieee.org wrote:
Hello group,
Does anyone know why the conducted emissions for ITE products starts
at 150KHz and end at 30MHz? Why not start at 120KHz or 190KHz. Why
finish at 30 and not 40MHz?
Thank you
Peter
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