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| To: | [email protected] |
|---|---|
| Subject: | Re: LF: OT End of the BBC World Service on Shortwave |
| From: | Jacek Lipkowski <[email protected]> |
| Date: | Mon, 31 Jan 2011 21:19:07 +0100 (CET) |
| In-reply-to: | <003301cbc163$c542e610$0401a8c0@xphd97xgq27nyf> |
| References: | <[email protected]><[email protected]> <[email protected]> <003301cbc163$c542e610$0401a8c0@xphd97xgq27nyf> |
| Reply-to: | [email protected] |
| Sender: | [email protected] |
On Mon, 31 Jan 2011, mal hamilton wrote: You are correct about the Internet being vunerable but you forgot to mention Broadcast JAMMING which is a regular occurance when your information is not wanted. This renders the transmitted information useless. a local jammer doesn't work well - groundwave doesn't propagate far. the only way to jam is to bounce your signal off the ionosphere, but you need higher power for that, and the jammer has to be far away (usually in a different country). if the jammed stations work on multiple different frequencies, then you really need a lot of jammers, in different locations, to take varying skip zones into account etc. we had Radio Free Europe etc jammed for many years, and somehow people were still able to listen to it :) VY 73 Jacek / SQ5BPF |
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