Re: Transmit AM through FM Filter?

Posted by AD6XY on Jun 27, 2008; 8:25pm
URL: http://elecraft.85.s1.nabble.com/Transmit-AM-through-FM-Filter-tp365954p365961.html

Of course, the FM filter can be used for AM transmit. All you need to do is tell the radio it is an AM filter. It will not know otherwise.

There is really no reason not to transmit wide band AM, just like there is no reason not to transmit wideband SSB. The modes are perfectly legal in most of the world. For voice, it is a waste of spectrum but for digital modes, especially on the higher bands having more audio bandwidth may be useful.

I think it might be that, in the USA it is not legal to transmit 15kHz wide AM or SSB. This is a difference between the USA rules and the rules elsewhere. In the USA, people are expected to do foolish things unless they are told not to, hence the limitations on transmitting out of band. Here in Europe, we have just as many fools, but it is considered their responsibility. We suffer greatly because of this but it also gives us a lot of freedom.