开云体育

Hi Group,

When I was working for the local TV station as a transmitter tech for our network. We used a German made TV field strength meter, I can't recall the brand or model. It had a B/W crt on the left and it used a green fluorescent readout of frequency. It was in a brown case, about 15mm high by 300mm wide and ran off a 7Ah battery. We used it with a telescopic element dipole (one for VHF and one for UHF). This came with a calibration chart for antenna efficiency/frequency and a short length of flexible tape measure for setting the elements to the correct length for the frequency of the signal.

If you are only a few wavelength away, then you could probably manage with a simple diode detector. And an antenna similar to one mentioned above (suitably matched to the detector). Calibration would be an issue, but your relative measurements should be consistent. However, if like me, you have several high power transmitters in your vicinity, you may wish to add a passive tuner (or bandpass filter) in front of the diode. (I have five AM stations, 1 - 20KW ERP within 5Km, plus twelve FM stations, of 20KW ERP, two DAB transmitters and five 50KW ERP DTV transmitters within 7Km). I think that an adjustable length dipole would be easier (and cheaper) than a wideband antenna.