@Nigel Goodwin,
After almost 30y I've worked at the Ministry of Communications in my country, I think (well...I've checked) the "legality" of the frequencies I'm asking. The law is very simple: Any device can work at those frequencies, if it's output is less than 25mW. About CB for example (AM) they limited it to 100 mW and 88-108 (as most "non pro bugs" are transmitting) - not permitted at all. We have - as much as I know for certain - at last about 20 FM pirate stations that transmit over this range 88-108MHz, and noone cares that their output is more than 100W, and their harmonies are doing real trouble to airports.
I want to build a really small device, less powerful than permitted. The devices like the one I'm trying to build are sold all over the world. I've bought more powerful devices from all Europe and US. Crystal and Non-crystal controlled devices. You can find them all over the net, sold as a stand alone or with Air-Band receivers. I just wanted to clarify once for all this point.
About the technical help: I really hope that someone that really knows the RF field, may help me with this project. I can spend money and buy a ready made device and just copy it, but I really want to understand what am I doing, why should I use a "x" crystal and not a "y" one. Which crystal is used for "z" overtone.
This was not my field at my work, I've worked on OTDRs, TDRs, electronic Meggers and so on, but I hope I could understand and build this device.
BTW, the operating the circuit with BH1417F at several mW is legal?... buiding a nice RF amp to it can really make a lot fun to neighbours :lol: :lol:
So, please, if you can help and have the good will, I'll be vey thankful
After almost 30y I've worked at the Ministry of Communications in my country, I think (well...I've checked) the "legality" of the frequencies I'm asking. The law is very simple: Any device can work at those frequencies, if it's output is less than 25mW. About CB for example (AM) they limited it to 100 mW and 88-108 (as most "non pro bugs" are transmitting) - not permitted at all. We have - as much as I know for certain - at last about 20 FM pirate stations that transmit over this range 88-108MHz, and noone cares that their output is more than 100W, and their harmonies are doing real trouble to airports.
I want to build a really small device, less powerful than permitted. The devices like the one I'm trying to build are sold all over the world. I've bought more powerful devices from all Europe and US. Crystal and Non-crystal controlled devices. You can find them all over the net, sold as a stand alone or with Air-Band receivers. I just wanted to clarify once for all this point.
About the technical help: I really hope that someone that really knows the RF field, may help me with this project. I can spend money and buy a ready made device and just copy it, but I really want to understand what am I doing, why should I use a "x" crystal and not a "y" one. Which crystal is used for "z" overtone.
This was not my field at my work, I've worked on OTDRs, TDRs, electronic Meggers and so on, but I hope I could understand and build this device.
BTW, the operating the circuit with BH1417F at several mW is legal?... buiding a nice RF amp to it can really make a lot fun to neighbours :lol: :lol:
So, please, if you can help and have the good will, I'll be vey thankful