According to the test lab, your radio is way off spec. Also, your range testing also seems to confirm that. Conducted, your receiver sensitivity is excellent - however, radiated sensitivity is a different story. Quite possibly, you have a strong wideband emitted signal that is raising the noise floor of your receiver. I would lay odds that this signal is coming from your CPU/DSP chips. Another possibility is your antenna is not the correct one for your band, but even a bad antenna should perform better that this.
I would look at improving the shielding of your digital section to see if that helps.
The thread sounds confused. You are apparently reporting a violation of harmonic or spurious emission requirements ("radiation measurement"). It's neither related to receiver sensitivity nor transmitter output power, at least not directly.
You did however not tell at which frequency the limit values have been exceeded. Neither information about the measurement conditions.
Not true. What is failing is AVERAGE USABLE SENSITIVITY from ETSI 300, Section 8.1. The spec for frequencies 300-440MHz is 24.5dBµV/m. They are failing this with average readings of 42dBµV/m.
@Rickf3 Do this test in your lab:
1) Set a radio up to receive at your frequency.
2) Set a signal generator with an antenna to transmit a 1k tone at that freq and adjust the output power to give a SINAD at the radio of approx 15dB (this is just arbitrary).
3) Take ANOTHER radio at the same frequency (turn the volume to minimum) and move it around the test radio.
If the second radio degrades the sensitivity of the first, you know that you have a problem with radiated emissions.
And i have a presumptuous request,I will send you my skype by private message,do you mind to add me?so i can send you more detail information and lab setup.
Thank you.
If I calculated right, the field strength in your field test is considerably higher than the ETSI usable sensitivity limit value and also higher than the sensitivity determined by the lab. It's necessary to design a simplified test setup that actually stresses the "usable sensitivity".
If I calculated right, the field strength in your field test is considerably higher than the ETSI usable sensitivity limit value and also higher than the sensitivity determined by the lab. It's necessary to design a simplified test setup that actually stresses the "usable sensitivity".
According to the test lab, your radio is way off spec. Also, your range testing also seems to confirm that. Conducted, your receiver sensitivity is excellent - however, radiated sensitivity is a different story. Quite possibly, you have a strong wideband emitted signal that is raising the noise floor of your receiver. I would lay odds that this signal is coming from your CPU/DSP chips. Another possibility is your antenna is not the correct one for your band, but even a bad antenna should perform better that this.
I would look at improving the shielding of your digital section to see if that helps.
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