the discriminator part.

careful using 330mhz due to the Military airband

if you're not in or Near the UK or a NATO Country then obviously ignore this
TBH even in somewhere like Dublin i'd be worried . when the planes are at exercise height over somewhere like RAF Valley anything in Dublin will come in strongly

it will be for very short distance about 700 meters and on 205.3 mhz
can you give me the spectrum of frequency range
thanks

Oh thats cool then
230 - 400mhz is the military airband range

205.3 sounds like a good choice

Good luck with it

205MHz here is right in the middle of the DAB band. It is possible (and quite easy) to hide a link between DAB "bouquets", but you'll need a better receiver than the London muppets can build you to recover the signal!

who can share the whole frequency spectrum chart?

It depends what country you're in!

Lebanon beirut middle east

But the spectrum of frequency is standars like tv from 48 to 862mhz then ....fm 88to108 and fm from 76to89.9 japenese band ....air band from 108 to 130 i gues and so on i was having a paper that i lost

In the UK, free-radiating TV is only from 490 - 670 MHz these days. The Japanese VHF broadcast band is 76 - 95 MHz, in Europe it's (mostly) 87.6 - 107.9 MHz. The aircraft band is 118 - 137 MHz throughout the world, 150 - 225 MHz is used in some parts of the world for TV broadcasting, in Europe it's (mostly) used for DAB broadcasting. 225 - 390 is used for the military, 400 - 470 is used for short range communications (apart from the 440 - 450MHz amateur band), 470 - 582MHz is Band IV TV (my favourite place to link - in between the TV channels, using TV aerials), 582 - 862MHz is Band V TV......

These allocations do vary from country to country, but you should find that they're largely correct.

I always liked to link in Band IV. The gear's not difficult to build, and there are cheap TV receiver "front-ends" that you can easily use for the receiver. The aerials are cheap and high gain without being too big, and nobody notices a TV aerial on a rooftop! Make your Link Transmitter and Link Receiver use 75Ω aerial connections, and you can use TV coax and aerials!

thank you for explenation albert