Total posts : 45366
It’s interesting that you mention 45 dbu as a lower usable field strength.
When Bill Baker of Information Station Specialists visited me earleir this month I asked if he had an FIM with him. Yes, so I asked if he could give me a read on our AM TIS to see if I was at the proper field strength.
So we drove the specified distance from the transmitter and it checked good.
I inquired about the Grundig G8 Traveler radio they sell for measuring field strength. He said that a reading from the Grundig of 45 dbu on my frequency would be the correct value. ISS provides a cross reference sheet which shows the dbu reading of the Grundig that correcsponds to a calibrated Potomic FIM with adjustments for frequency.
He stated that the G8, from one to the next, is fairly right on the mark and makes a great, inexpensive way to check field strength.
I’ll be trying that with my license free, low power AM station as I have a G8.