I just bought this transmitter- http://electronics-diy.com/product_details.php?pid=302&name=Wireless%20PLL%20Stereo%20FM%20TX%20with%20LCD%20%28fully%20assembled%29 which is nice because the price. it does digital tuning, it has memory banks for set freq, and its PLL stabilized.
also, the output is claimed to be 50mw, which in my case will usually be fine, but i also want the option to turn on an amp to make the output to 500mw or more.
i found this schematic for a Class C RF amplifier. i understand most of this, but i have a couple questions because the parts i found arent exactly the same as whats shown. I spend a few hours last night scouring through datasheets to try and get parts that match up nearly perfectly to whats shown, i think
The MIDDLE row is what im after- 100MHz/24dBm boost.
1.- the variable capacitor i found is 50v 11pf
2.- the other capacitors are basic ceramic type
3.- the FD700 diode is hard to find. mouser has a seemingly similar one- this is my biggest worry.
4.- this will be tuned to amplify around the 100mhz range, so i do not need C3.
Do all my points seem OK? i just dont know enough about RF amps to know if im doing this right. i could post the list of all my acutal parts, but i dont expect someone to compare all the datasheets and everything (what a PITA!)
also, the output is claimed to be 50mw, which in my case will usually be fine, but i also want the option to turn on an amp to make the output to 500mw or more.
i found this schematic for a Class C RF amplifier. i understand most of this, but i have a couple questions because the parts i found arent exactly the same as whats shown. I spend a few hours last night scouring through datasheets to try and get parts that match up nearly perfectly to whats shown, i think
The MIDDLE row is what im after- 100MHz/24dBm boost.
1.- the variable capacitor i found is 50v 11pf
2.- the other capacitors are basic ceramic type
3.- the FD700 diode is hard to find. mouser has a seemingly similar one- this is my biggest worry.
4.- this will be tuned to amplify around the 100mhz range, so i do not need C3.
Do all my points seem OK? i just dont know enough about RF amps to know if im doing this right. i could post the list of all my acutal parts, but i dont expect someone to compare all the datasheets and everything (what a PITA!)
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