1) Transmit on the same frequency with considerably more power than the BC station.
2) Take down the power to the BC transmitter and then transmit on the frequency.
3) If the BC station is using a
STL radio link, find the frequency of the link and take over the frequency.
Doesn't seem that hard to do, or am I missing something?
To do as you describe in 1) might be beyond the ability of an airborne platform with its limited power budget. To do this against any one station requires the jammer to achieve a specific (defined by the information of the transmission) J/S (jam to signal) ratio. This ratio can be achieved by either the jammer having a higher ERP (by the desried J/S) than the target signal, or the jammer source being closer to the receiving station. The geometry of getting your jammer closer to the receive stations results in a small affective footprint.
To achieve a higher ERP than a single 25 kW (25,000 Watts) FM broadcast station plus a 10+ dB J/S might require something on the order of more than 60 dBW. Call it 100 kW and a 10 dB antenna gain…from an airborne platform…to defeat a single station. And you have to work similar things out for each and every FM BC stations in the “specific area”. Just as an example there are 23 FM stations in the Cairo, Egypt, area. Most of them are less than 25 kW, but most are also more than 2.5 kW. To jam and take over the broadcast of all of those stations might well require more than 1 MW (one million Watts) of power.
And that is just the FM BC band, TV would be a similar issue (if required, Commando Solo addresses TV, but the survey does not mention TV), but the AM band would be even tougher, because I doubt you would get the antenna efficiency of a land station from an airborne platform (I am assuming airborne platform, if you already have boots on the ground just take over the station). What you cannot do in antenna gain you must do in raw transmitter power.
You might end up needing a 10 Megawatt power source just to supply the jammers.
So I assume someone will propose something a bit more sexy and bit less brute force.
What you describe in 2) is already done using a few low cost LGBs and the afore mentioned Commando Solo aircraft.
What you describe in 3) is not very practical. It would work for relatively few stations and then all the station owners have to do is kill the link and feed the audio via a different source.
To do the tasking described in the market survey is not a trivial matter. Note that the survey is clearly defined as not being a request for proposal. They only want to find out who in industry might think they have the necessary hardware, skill set, and past performance, to take on such a task. It would be a pretty fun project to be involved with, I can think of a couple of approaches that might apply. But, more data would be needed to down select to a set of options.
Also notice the survey also specifies that they are looking for “a non-developmental light-weight, multi-frequency, simultaneous over-broadcast system that has demonstrated a Technology Readiness Level of 8 or higher”. This sounds like they have specific hardware in mind. If I was a betting man I would say they already know who and what they want, or at least have it narrowed down quite a bit, but they are starting the process of acquisition now. They probably have a pretty good idea who is going to respond, and with what information.
T!