R
Robert Lacoste
- Jan 1, 1970
- 0
Hi,
I'm wondering if someone could explain how the low cost RF field level
meters actually works. I mean devices that display field level in V/m or
mW/cm2, over a very wide band (MHz to GHz).
For me it is easy to build a wideband "field level" receiver, giving the
level of a received signal from a dipole antenna expressed in µV or dBm, but
the relationship between received level and field strenght is frequency
dependant, right ? Something like "field level=received level-antenna
gain-20log(F)+constant "? So how to they get the field level without knowing
the frequency ? Or do they measure it ? Is there something I'm missing ?
Any link to wideband antenna design will also be welcome...
Many thanks for your help...
Bob.
I'm wondering if someone could explain how the low cost RF field level
meters actually works. I mean devices that display field level in V/m or
mW/cm2, over a very wide band (MHz to GHz).
For me it is easy to build a wideband "field level" receiver, giving the
level of a received signal from a dipole antenna expressed in µV or dBm, but
the relationship between received level and field strenght is frequency
dependant, right ? Something like "field level=received level-antenna
gain-20log(F)+constant "? So how to they get the field level without knowing
the frequency ? Or do they measure it ? Is there something I'm missing ?
Any link to wideband antenna design will also be welcome...
Many thanks for your help...
Bob.