In short: "I don't think there would be much harm testing such devices" is irrelevant - what matters is what you actually do and whether it causes harm.
I do not say that to be blasé however my expectation of the interference caused from a sub 1W transmitter in a field vs the interference and noise generated by a running microwave would be relatively minimal and little cause for alarm.
Not a valid comparison, since microwave ovens operate at different frequencies (and therefore won't splat on the same third parties), and have somewhat controlled modulaton characteristics.
Consider that GSM phones work when receiving signals that are at -100dBm, i.e. 0.0000000000001 of the 1W you might transmit at (i.e. 130dB down!). (And we won't even consider the power that isn't being received from the Voyager probes
)
Considering this is a somewhat new field for me I am here to learn.
If you can't honestly answer those questions, I suggest you contact you local ham radio enthusiasts.
I will certainly try to track some down. I am in Western Australia, if anyone knows when/where they meet that would be a big help.
As for understanding those questions. That is the information I am wanting to find, where are the resources I can look at to learn to ask those questions, what search terms do I put into the all mighty answer machine? Is there a good undergrad/grad level book to pick up this field? That is what I am asking for in this post.
If only it was that simple.
RF engineering takes a
long time to learn and is
very different to analogue, let alone digital.
And even when you've got it all under your belt, the practical nasties come and bite you: there are many things that you just have to measure, since there are too many effects to be able to predict, although very expensive CAD packages can help, if and only if used appropriately.
And then you have to be aware of the "rusty bolt effect". One consequence is that you don't know exactly which combination of comms frequencies are usable on a naval ship - to a large extent you have to "suck it and see". Repeatedly, since they can change during the ship's lifetime. And even then, sometimes you can be right royally screwed, as happened to HMS Sheffield in the Falklands conflict.
Local radio hams are your best bet for a practical experience, and they may even have the test equipment necessary to measure the spurious emissions.
Again I am learning and paying attention to the laws vs just using another 900Mz XBEE pro or random Chinese RF transmitter.
Assuuming the manufaturere isn't lying through their teeth, theire equipment should have been "type certified" before use.