Possible to use compact AM transmitters in a network?

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wizardofaz
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Possible to use compact AM transmitters in a network?

Post by wizardofaz » Wed Jan 27, 2016 9:00 am

Hi, a newbie here. I am seeking feedback from forum regulars regarding a project project. How would one do it?

ENVIRONMENT: The area of coverage is a politically hostile environment with an oppressive regime that has a total control over TV/Radio channels that broadcast only what gov't orders to. Although, internet based social networks are allowed, they are heavily monitored; any outspoken opposition members are actively pursued and prosecuted.

END RESULT: Transmit AM broadcasts to a landmass covering a circle with 350km radius with weekly programs covertly.

MEANS: $70,000 and a group of 20 volunteers dispersed across the coverage area.

REQUIREMENTS:
> system has to have ability to switch frequencies quickly to overcome jamming
> any equipment placed locally would need to be done so covertly

PROPOSALS:
> One powerful transmitter in a neighboring country that would be able to transmit to an adjacent area of a circle with 350km radius
> A network of compact transmitters, placed accross the coverage area, with an internet enabled device attached to them that would play the audio

Any feedback would be greatly appreciated!

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Deep Thought
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Re: Possible to use compact AM transmitters in a network?

Post by Deep Thought » Wed Jan 27, 2016 9:19 am

Politics aside, you're up against some very difficult engineering challenges trying to cover a 350 KM radius. To do it with one transmitter would require (at least) a 50 KW rig plus a fairly conspicuous tower (>200 feet or more) which would be very easily discovered. To do it with a network of easily-concealed low-power transmitters and antennas would take dozens of them. Both of those exceed your budget by two or three times and all of them would be easy targets for whatever "enforcement" they might attract.

A transmission system in a neighboring country capable of lighting up ~384,000 sq. km. of land next door would require a much larger (250 KW) transmitter and/or a directional antenna to concentrate the signal in one direction. Add another $250,000 to the project.
Mark Mueller • Mueller Broadcast Design • La Grange, IL • http://www.muellerbroadcastdesign.com

wizardofaz
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Re: Possible to use compact AM transmitters in a network?

Post by wizardofaz » Wed Jan 27, 2016 10:32 am

Deep Thought - Thank you sir for your take on this. It looks like one would need to increase funding before doing implementing anything as such. Your thought are greatly valued. Thank you!

dbuckley
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Re: Possible to use compact AM transmitters in a network?

Post by dbuckley » Wed Jan 27, 2016 2:00 pm

Deep Thought wrote:A transmission system in a neighboring country capable of lighting up ~384,000 sq. km. of land next door would require a much larger (250 KW) transmitter and/or a directional antenna to concentrate the signal in one direction. Add another $250,000 to the project.
The problem with this sort of setup is that it is very susceptible to both jamming and absorption. Building a 250KW tx just outside a border would be fairly noticeable, and thus the hostile government would notice it, and if they cared, they could build countermeasures to render it ineffective. Its a lot easier to absorb a load of RF power than it is to generate it.

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Deep Thought
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Re: Possible to use compact AM transmitters in a network?

Post by Deep Thought » Wed Jan 27, 2016 2:08 pm

The whole idea is not feasible anyway without some serious funding (see: Radio Free Europe), but I thought I would play along... 8)
Mark Mueller • Mueller Broadcast Design • La Grange, IL • http://www.muellerbroadcastdesign.com

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