Take-san,
for a small number of constant level carriers, such as 5, they should be
considered to add in phase when passed through a clipping amplifier,
rather than according to individual power. Thus the second term in the
formula quoted below would be -20log_10 (5), about -14dB, rather than -7dB.
If these constant carriers are not considered to add in phase, rather
than according to power, then the signal will clip, causing
intermodulation products and worse, depending on the degree of clipping.
Hope this helps,
Robin, G8DQX
On 08/04/18 09:05, Tsutsumi Takehiko wrote:
Saku,
I thought your measurement of 5 carriers should be around -8dB –
10log (5)=-15dB but your measurement was much worse.
Regards,
take
de JA5AEA
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