pike said:
I'm trying to do what your doing atm. But i'm trying to to it digitally. The output signal is a digital wave. Theoretically you can make an extremely powerful transmitter. possibly stronger than the licensed stations aswell. It would have to be crystal locked with a PLL. This would also be very very accurate and have virtually zero frequency drift.
were still looking for a pll of high enough frequency range (30mhz+)
*Note however this is for extremist in this field who want power :twisted:
It's common in VHF radio to use a far lower frequency and multiply it to the frequency you require, the 2M amateur band (144MHz) usually uses 12MHz oscillators and multiplies it 12 times. This also has the desirable effect of increasing your deviation. However, with a crystal you're not likely to get the high deviation required for a broadcast receiver.
If you search on these forums, there was a link (not long ago) to just such a PLL transmitter, which applied the modulation in the phase lock circuit, giving broadcast style deviation and accurate frequeny settings.
I presume unlicenced broadcasting in Australia is severely illegal?, as in the UK - and certainly if you're looking at higher powers than commercial stations you are going to be VERY easy to catch.
It's also going to be expensive to build high power transmitters, and complicated as well - with a need for expertise and specialised test equipment.
Assuming the laws are similar to the UK?, if (when?) caught EVERYTHING connected with it will be confiscated - transmitter, audio equipment, CD's, computer - the LOT. Plus a potentially very large fine, and possible jail sentence.
If caught, I would advise grovelling in court - I used to know a guy who got caught three times! (only with low power), the first time he was fined, the second time a bigger fine, the third time he grovelled embarrasingly in court and escaped with a warning :lol:
In all three cases all his gear was confiscated and destroyed, including his complete record collection (it predated DC's).