On 07/12/2021 11:44 AM, [email protected] wrote:
Hi all,
I am measuring the power of two signals (sinusoids) through an RMS
calculation, using an TwinRX on a x300 motherboard. In the calibration
process (lab conditions, no noise, no interference) I’m trying to
obtain a differential power (p1-p2) of 0dB or at least constant at
±0.5dB . One of the channels, RX2, is highly stable with respect to
the environment temperature variations, while the other one, RX1, is
much less so.
I am aware that this might be a very particular use case, but was
wandering if anyone had had this kind of experience or at least knows
if there is any documentation/datasheet concerning temperature
sensibility of these two components?
Best regards,
Arjan
RF components have a temperature dependence. Amplifiers typically these
days have a gain-vs-temperature coefficient of roughly 0.05dB/C. Cabling
also has a temperature-vs-loss coefficient which varies with cable
length, cable type, and operating frequency.
Something else that sneaks in is loose connectors--SMAs in particular
are notorious for developing temperature-related "funnies" while not being
obviously damaged. They need to be torqued properly.
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