FM-transmitter?

Off-topic Chatter
1

Hi!

Again, I seek advice for a problem from off-topic…

Long story short:
At work, we have terrible coverage on FM -radio.
Mostly because surrounding steel etc.

I use Active Peltors (Alert) with radio to listen some tunes (as much as comes through…).

Is it possible to purchase or DIY a FM-transmitter, that could first be feeded with cell phone (internet radio does not have interference, local stations have internet feeds) and then broadcasted inside the “bunker”?
I´m looking for a range of maybe 100ft to 300ft tops.

I think those car transmitters might get a bit too weak.

2

are you allowed to use such devices in Finland? in Sweden i think you can’t have too powerful fm-transmitters without license.

but maybe you aren’t too concerned about that :wink:

3

I´m not too concerned but I think a basic cigarette-plug will be a tad too weak.

On the other hand, I have found gear like 0.5W -> 1W and up. They are probably WAY too strong for this use.

I would like to keep it pretty minimal…
I can use Peltor´s with AUX IN -wire but it causes too much hassle when working and moving around.

Bluetooth Peltors on the other hand cost something insane, like 400$?

4

I think the answer must be yes, but I think bluetooth is cheaper and maybe easier.

i’ve used an fm car transmitter in my car but they’re terribly weak.

here’s a cheap bluetooth model, that has a widely known modification that might make it strong enough for inside your faraday cage

http://slickdeals.net/f/5862512-Belkin-Bluetooth-Music-Receiver-for-iPhone-3G-3GS-iPhone-4-iPod-touch-2nd-Gen-F8Z492-P-18-99-ac-fs-newegg

https://www.google.com/search?q=Belkin+Bluetooth+Music+Receiver&aq=f&oq=Belkin+Bluetooth+Music+Receiver&aqs=chrome.0.57&sourceid=chrome&ie=UTF-8#hl=en&sclient=psy-ab&q=Belkin+Bluetooth+Music+Receiver+modification&oq=Belkin+Bluetooth+Music+Receiver+modification&gs_l=serp.3..0.3985.5700.0.5978.13.5.0.8.8.0.98.417.5.5.0.les%3B..0.0…1c.1.5.psy-ab.uhQwA9lMuk0&pbx=1&bav=on.2,or.r_gc.r_pw.r_qf.&bvm=bv.43148975,d.dmQ&fp=7def6efaebf4b1c4&biw=1280&bih=859

5

Seems like a good option but I think the price for BT headphones is killing the deal.
At the moment, I don’t have them. I have tried one Wurth -branded but the “hearing” feature was horrible on them…

I’m pretty sure I cannot send with Belkin, receive with phone and then push it to headphones via 2.5mm jack.

6

If you’re handy with a soldering iron www.ramseyelectronics.com has kits. Their FM10C kit might be what you’re looking for. It is legal in the US, but I don’t know about your country. I have a much earlier version of this kit 20 years ago, and I was able to get almost 1/2 Km distance clear line of sight. It might be able to cover your building or at least part of it depending on shielding.

7

Nice!

Sounds pretty much what I’m looking for and I like soldering something every now and then!

Edit:
Now! I got the right fee for shipping and it seems pretty affordable 8)
(I used first the wrong option while doing calculation…)

Thanks again for the link!