[TZ] Third order intermod in FM Station

[Robertm]

I just ran some numbers. If your spec analyzer has the typical 80 db display range then 50uv at the bottom of the display the undesired signal could be 500mv or 104 DBu. If the mast is 70 to 80 meters, that is about 1.5 miles. But that is only theoretical. In reality the signal will be less. 

If you use a single antenna and a combiner, a better way would be to measure from a line sample after the combiner. You will get a much better determination. If there are no intermods going up the line then any in the field are not created by you. 


On Sep 10, 2017, at 4:59 PM, Rolf Sandmeier <sistemasradio.hd at gmail.com> wrote:

>Ok. I'll try ASAP.  Thanks
>Em 10/09/2017 17:36, "Robertm" <bcstlists at icloud.com> escreveu:
>>An FIM should work as well.