[BC] FM Cubed - fascinating!

[Robert Meuser]

Since an FM transmitter is non linear, it would have to be injected at 
the output like high level combined IBOC. That would be the difficult 
part of the experiment, justifying and installing the injector - 
unless,  of course, you were preparing for an IBOC installation and do 
this little test before you turn on the hash. I did it once with 
separate antennas, although the power ratio was something like 13 db, it 
worked with the equipment we had. The reason I did it was to test a new 
emergency aux TX without going off air. So we made a minimal offset to 
'hide' the signal under our own. The aux antenna which was about 200 
feet lower than the main was used. Once we knew everything played 
properly, the TX was put on the correct frequency.

R


WFIFeng at aol.com wrote:

>In a message dated 03/24/2007 5:55:01 PM Eastern Daylight Time, 
>tom at bosscher.org writes:
>
>  
>
>>    I thinking of calling this FM cubed, for the three FM signals you 
>> could have. And I'm also looking for investors, or a buyout!
>>    
>>
>
>You could, of course, do almost the same thing with the FMeXtra system. :)
>
>Your idea sounds very interesting, tho... and you wouldn't need the special 
>radios to pick up the signals! The question, as you raised, is whether or not 
>anyone else will be able to get the signal due to the "proximity" of the much 
>stronger "main station" right next to it.
>
>Robert also raises a very interesting point... that 1 watt signal would 
>technically "meet the mask". You *might* just be able to try it, at least 
>experimentally, and see if it would even be worth pursuing in the first place. The 
>trick is going to be mixing it into the existing signal. Will you do it at the 
>exciter stage? Will the main TX handle it OK?
>
>This is quite fascinating. :)
>
>Willie...
>
>  
>