/diy/ - Do It Yourself

>>2787796
>technically the ham bands go well into microwave
Band position, yes, but not bandWIDTH.

>in fact everything above 10.5ghz is free game
That will surprise a lot of people. The charts I see show allocations to 275 Ghz.

>>2754064
>Of course, but with enough filtering, could the signal be used?
Sure. A 5 stage low pass filter might do.
>I have a digital electronics background, but I can design basic filters and such
LC filters are the most common.
>>Carrier only? And what frequency? Perhaps a plain crystal receiver, or something like RTL-SDR.
>Lets say any random frequency.
Send splatter to a military emergency frequency and things could become more interesting than you really want. The spectrum is already allocated and with many slots you might be compliant with. What is the purpose you have in mind?
>600KHz?
that is a rather low frequency and you will struggle to get much out. The 2.4 GHz ISM band might be a better fit if you want a compact antenna.
>And reception using only basic components (passives and BJTs) using an MCU.
Perhaps 433 Mhz might be a good fit.

>>2406704
Are you thinking of the ISM bands?

>>1874488
Soft mode: tons of bands and frequencies are reserved specific functions, not all of which are very specific or well aggregated and published as a whole. You mission, should you chose to accept it, is to make a "Frequency navigator" to annotate frequency bands with details on use. Presentation is a problem in itself, to make it thorough and clear. Pic. related is one example of what we have.

Hard mode: make a goniometer as discussed here: >>1872183 This will require a black belt in DSP
Brutal mode: add elevation
Extreme mode: add polarisation

>>1820740
>how about local LE?
Not sure, might be described vaguely as government services or land mobile services.
>Any idea how to make my baofeng a police scanner?
Not sure.

BTW these allocation charts can be nice as a wall poster. Pic. related.

Frequency allocations are rather complex. Pic. related.
And even within allocations, like amateur bands, there are sub-allocations (CW, RTTY, slow CW, fast CW and more), many that differ between regions.

Is there some interactive diagram available? Perhaps naively I would have thought a HTML based tool would enable navigation and drill down to the specifics.