[K3] [Elecraft] Transmit AM through FM Filter?
AD6XY - Mike
m.j.willis at rl.ac.uk
Fri Jun 27 16:25:37 EDT 2008
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.
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