chickens1127
New Member
Hi! I'm building an AM transmitter, and I found a really easy link to a design here:
Chapter 4: Radio -- Build a very simple AM radio transmitter
Now, I'm real cheap, and I was reading another article on instructables, and people were taking them out of cheap radio recievers. Would they have one inside them? I really don't wanna pay $8 shipping on a $3 item which will take a week to come.
Second, you need an audio transformer, 1000 ohms to 8 ohms. I'm happy to get that from Radio Shack, but can I salvage it possibly from some cheap electronics with a headphone jack?
Finally, FCC Part 15 says AM transmitters can only use 100 mW of power, which, according to most sites, with a good antenna, you can get 1/4-1 mile. Now, this page claims only 150 feet, so is this rig transmitting 100mW and needs a better antenna? If so, should I just add more coils, or another design of an antenna. (I am a ham operator.) Or, how do I improve this to max out on power. I'm going to make a mixer with 2 or 3 inputs with switches and such and local radio for my community. Thanks!
Chapter 4: Radio -- Build a very simple AM radio transmitter
Now, I'm real cheap, and I was reading another article on instructables, and people were taking them out of cheap radio recievers. Would they have one inside them? I really don't wanna pay $8 shipping on a $3 item which will take a week to come.
Second, you need an audio transformer, 1000 ohms to 8 ohms. I'm happy to get that from Radio Shack, but can I salvage it possibly from some cheap electronics with a headphone jack?
Finally, FCC Part 15 says AM transmitters can only use 100 mW of power, which, according to most sites, with a good antenna, you can get 1/4-1 mile. Now, this page claims only 150 feet, so is this rig transmitting 100mW and needs a better antenna? If so, should I just add more coils, or another design of an antenna. (I am a ham operator.) Or, how do I improve this to max out on power. I'm going to make a mixer with 2 or 3 inputs with switches and such and local radio for my community. Thanks!