neazoi
Advanced Member level 6
Hello, I have found this little powermeter https://www.sm7ucz.se/QRP_Meter/QRP_Meter.htm and I like it because it is passive and it has a logarithmic scale.
I want to alter it to a "selective voltmeter" or "wave analyzer", for the HF radio amateur bands, so that I can monitor the different harmonics levels.
I believe this can be done with a set of band pass filters in the input. Is there any other way this can be done?
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Hm... searching around I have found an excellent filter for the job https://www.af4z.com/Contest_Filter.htm
It uses band-reject filters, which do not need to use power intuctors and capacitors, based on the fact that the harmonics of a transmitter cannot usually be that large to cause components burn-out. The good thing is that this filter if properly switched will have a much smaller attenuation of the wanted signal, whereas all band-pass filters have some attenuation. This will hopefully allow for more accurate measurements.
What is your oppinion on that approach?
I want to alter it to a "selective voltmeter" or "wave analyzer", for the HF radio amateur bands, so that I can monitor the different harmonics levels.
I believe this can be done with a set of band pass filters in the input. Is there any other way this can be done?
- - - Updated - - -
Hm... searching around I have found an excellent filter for the job https://www.af4z.com/Contest_Filter.htm
It uses band-reject filters, which do not need to use power intuctors and capacitors, based on the fact that the harmonics of a transmitter cannot usually be that large to cause components burn-out. The good thing is that this filter if properly switched will have a much smaller attenuation of the wanted signal, whereas all band-pass filters have some attenuation. This will hopefully allow for more accurate measurements.
What is your oppinion on that approach?
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