>>>>
>>>>This, at least to me, also requires considerably more experience than, say, determining the signal dispersal pattern of a 1500-foot tower with 10K watts of transmitter power at 1600KHz over flat terrain (BG)(ducking).
>>>
>>>
>>>Ah, a weak AM radio station to be sure... do you have the humidity, temp and geographical coordinates... it will make solving the problem a lot easier... :)
>>
>>Jerry;
>>
>>I would have to know what type of antenna was in use as well as specific information about the type of ground involved. Most of all you must know the pattern you are required to propagate as you should not interfere with other stations located outside your area. When I was a teenager I obtained my First Class FCC Radio Telephone License - and got to do these types of things. Since I had a Radio Amateurs License I thought I would enjoy a commercial license.
>>
>>We had a station in San Francisco (Belmont actually) at 1550 khz - classical music. It was not allowed to transmit a signal below Gilroy (about 80 miles south of San Francisco) and could be heard in places as far away as Finland! I believe it was only 10 kw. You would be surprised what 10 kw and a three element phased array could do! Our terrain is not flat which makes things more interesting.
>>
>>Tom
>
>KOA in Denver, 50KW, was only five blocks from my house. I could use a cat's wisker, galena crystal, a coil of wire and a bubble gum foil capacitor to create a crystal radio that would power a 2KOhm headset so loudly you could hear it across the room! I would put it under my pillow and listen to the sounds of the "Cool Bill" show each night.
>
>You ever hear of 'under ground' radio? During the 'revolution' of the 60s and 70s various left wing groups would communicate with each other to coordinate their events. They used 50 to 150 W audio amplifiers. Instead of driving their speakers, they would connect the speaker wires to rods driven into the ground. The negitive rod would be about 10' long and driven almost completely into the earth. The positive rod was 5' long and was driven into the ground about 50' away from the negitive rod. The 'transmitter was sending out audio waves,

Sorry, I meant radio waves at an audio frequency...

very similar to the Polaris submarine 13KHz transmitters near Silver Creek, Ne. The transmitter became a reciever by pluging the wires from the grounded rods into the high impedance input (to keep the load very low- now we'd use op-amps) and connection the speaker wires to the speaker. Ranges of 5 and 10 miles were easily reached, from what I've heard.
>JLK