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Old 01-21-2007, 10:58 AM   #1
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Default Can someone recommend a FM transmitter capable of at least 1KM

I live in a rural location and was wondering if anyone recommend a fm transmitter capable of broadcasting at least 1km. I know its against the fcc but I'll take my chances hehehe. I've been looking on ebay but theirs a million of them on there.
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Old 01-21-2007, 03:54 PM   #2
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Ramsey makes nice FM transmitters that will handle that. The two that come to mind are the FM25 and the FM30. You can get them in kit form that you build yourself, or you can get them pre-assembled. I bought a pre-assembled FM30 from an eBay seller. I've had it for almost a year now and it's been great. I use it to transmit Sirius and my iPod to my garage that is a few hundred feet away as well as using it at work. They can transmit quite far depending on the antenna. I built a 1/4 wave ground plane antenna just as an experiment, and picked up my signal clear as a bell from about 2 miles away. Currently I just use the whip antenna that came with it, which gets the signal to where I need it just fine. They are not cheap, but well worth it.

www.ramseyelectronics.com

Lots of useful info at their user forum too:

http://www.ramseyelectronics.com/cgi...?ubb=forum;f=1
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Old 01-22-2007, 04:30 AM   #3
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How far do you pick up reception with your Fm30 with the whip antenna? I have the fm10c and it doesnt go far enough for my work. About 300 feet or so. I need something that will go about500-600 for work. Building a bigger antenna is not an option for me at work. I am going to build one for me at home and use the fm10c at home if I can get a more powerfull one for work.
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Old 01-22-2007, 04:32 PM   #4
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I definately get 500-600 feet with the supplied whip antenna. I mounted the whip antenna a few feet away from the transmitter. That helped a little with the signal distance and really helped eliminate any hum due to RF feedback, which you get from the antenna being connected directly to the transmitter itself. Another thing that helps with my signal distance is the fact that my apartment is on the second floor. The transmitter sits on my desk and I have the antenna about 3-4 feet to the right of it mounted to the side of a sliding glass door frame. I bought a 12' RG-58 cable with BNC connectors and a BNC coupler at Radio Shack to get the antenna mounted away from the transmitter. If you need help building a 1/4 wave antenna, let me know. I built the one in the pic below for less than $15.

p/n's for the cable and coupler:

cable: 278-965
coupler: 278-115

pics:

FM30 sitting to the right of the printer


whip antenna mounted in sliding door frame


1/4 wave ground plane antenna mounted on my balcony


close up of 1/4 wave antenna
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Old 01-22-2007, 05:40 PM   #5
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that is way cool. I would definately like to know how you built that antenna for 15 dollars. Ive researched them and havent figured out to build one that cheap.
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Old 01-22-2007, 07:15 PM   #6
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Here are the items I used:

15' of #10 bare solid copper wire (#12 would work too and would be a little easier to fit in the stem of the SO-239 connector, I had to file down the #10 to get it to fit)
small machine screws w/nuts & washers
SO-239 connector (radio shack p/n 278-201)
BNC to PL-259 adapter (radio shack p/n 278-120)
20' RG-58 coax cable (radio shack p/n 278-967)
1" PVC pipe for the mount

I guess less than $15 is not fair, since I already had some of this stuff (the copper wire and screws and PVC pipe) and I bought the cable and connectors at local electronics supply shop, which was about half the price of Radio Shack.

I cut the copper wire to the length that is appropriate for the frequency that I use to transmit on. Here's a site that will give you the correct antenna length:

http://www.qsl.net/w4hn/antennaCalc.htm

Look near the bottom left where it has an area to calculate 1/4 wave. The four ground plane radials get cut to about 5% longer than what the single vertical is.

Here a pic of the SO-239 connector with the copper attached:

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Old 01-22-2007, 08:18 PM   #7
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If you're really serious about range the CTE TX500 Plus will fill the bill.... With a decent antenna and 400 foot tower you'll get minimum of 80 miles.
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Old 01-23-2007, 04:30 AM   #8
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Sweet Im definatley going to tinker with this on the weekend. How well does it stand up to wind? I wonder if I go through building this if the first gust of wind will blow it to pieces. Do you think it would still work if I covered the copper with some pvc to strengthen it?
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Old 01-23-2007, 05:54 PM   #9
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Quote:
Originally Posted by jwt873
If you're really serious about range the CTE TX500 Plus will fill the bill.... With a decent antenna and 400 foot tower you'll get minimum of 80 miles.
Oh shit, why did you have to go and show me that?!!!!!! I want!!!!!!
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Old 01-23-2007, 06:02 PM   #10
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Quote:
Originally Posted by MoeSyslack
How well does it stand up to wind? I wonder if I go through building this if the first gust of wind will blow it to pieces. Do you think it would still work if I covered the copper with some pvc to strengthen it?
I never had mine out when it was windy. It may need to be beefed up a bit to withstand strong wind. Putting the copper inside PVC should be fine, since the radio waves will go thru it. I was told to only use the white PVC, and not the grey. The grey may have a metallic quality that may interfere with the signal. Also, there are a number of good ideas on antenna building at the Ramsey forum, just do a search for "antenna".

http://www.ramseyelectronics.com/cgi...?ubb=forum;f=1
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Old 02-01-2007, 08:29 AM   #11
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Thanks for all the feedback guys, I have since revised my needs. I need at minimum 600' coverage. I ordered an EDMDesign 10mW/100mW dual output transmitter. This Tx comes hightly recommended.

I am installing this transformer in my Company's Ford F250 truck and it has a big fibreglass space cap. This Tx comes with a test wire antenna but I dont want to install this Tx on the dash of my truck so I am looking to install an antenna remotely on the fibreglass space cab of my truck.

I need some info to either purchase or build a "50 Ohm" antenna. It doesn't need a whole lot of gain as long as I can get a good 500' coverage off the 100mW output and the antenna needs to be small enough that it doesn't stick six feet above my truck.

Thanks guys in advance for your help
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Old 02-02-2007, 04:16 PM   #12
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Default want it to go real far?

http://www.veronica.co.uk/

Get a veronica transmitter and a comet cfm-95 antenna ....

You will be in violation of fcc rules anything past 50 milliwatts
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Old 02-02-2007, 09:23 PM   #13
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Quote:
Originally Posted by gumbyandpokie999 View Post
http://www.veronica.co.uk/

Get a veronica transmitter and a comet cfm-95 antenna ....

You will be in violation of fcc rules anything past 50 milliwatts
I already bought an EDMDesign dual output transmitter. I don't care about the FCC. I live in a rural area that only has 3 FM stations maybe 4 on a good day. I just want coverage over my property (2 acres).

The antenna I'm looking for it something realatively small and mobile. I might try building the one posted above. This antenna needs to be installed on my truck so i might make it so that the post that its on is hindged so I can lay it down when I'm driving.
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Old 02-03-2007, 11:06 AM   #14
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Default comet antenna

Quote:
Originally Posted by D0TC0M View Post
I already bought an EDMDesign dual output transmitter. I don't care about the FCC. I live in a rural area that only has 3 FM stations maybe 4 on a good day. I just want coverage over my property (2 acres).


The antenna I'm looking for it something realatively small and mobile. I might try building the one posted above. This antenna needs to be installed on my truck so i might make it so that the post that its on is hindged so I can lay it down when I'm driving.

Im tellin ya ,you want killer coverage get this Comet cfm-95sl antenna
Its very plain jane and easy to set up
http://www.progressive-concepts.com/...tem.html?id=47

with 1watt I get to 3 cities .
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Old 02-03-2007, 07:38 PM   #15
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Quote:
Originally Posted by gumbyandpokie999 View Post
Im tellin ya ,you want killer coverage get this Comet cfm-95sl antenna
Its very plain jane and easy to set up
http://www.progressive-concepts.com/...tem.html?id=47

with 1watt I get to 3 cities .
Gumby with all due respect how am I supposed to mount that beast on my truck? Especially on my company truck I won't be able to go under any over passes LoL
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