Page 1 of 4 123 ... LastLast
Results 1 to 15 of 53

Thread: FM transmitter antenna

  1. #1
    Super Moderator EricR's Avatar
    Status
    Offline
    Join Date
    Dec 2015
    Location
    Apex NC
    Posts
    338
    Thanks (Received)
    12
    Likes (Received)
    51
    Mentioned
    26
    Tagged
    0 Thread(s)
    Quoted
    124

    Default FM transmitter antenna

    So I picked up a Ramsey FM25B and it comes with a whip antenna. I will test this over the coming weekend but I expect it will be insufficient.
    What antenna do you recommend? I would like specifics. I know a 1/4 wave ground plane is probably what I want. Did you make yours or buy it? What special stuff do I need to connect the antenna?

  2. #2
    Havin fun ! kidcole's Avatar
    Status
    Offline
    Join Date
    Jun 2009
    Location
    Clayton, NC
    Posts
    3,964
    Thanks (Received)
    44
    Likes (Received)
    233
    Blog Entries
    2
    Mentioned
    76
    Tagged
    0 Thread(s)
    Quoted
    399

    Default Re: FM transmitter antenna

    For many years we have all been using a quarter wave Antenna from the website fmdxantenna.com. It was around $72 shipped for a variable antenna that you can tune to your frequency. There are many discussions here about those antennas ....

    UNFORTUNATELY - I just tried the site and it is down. I hope maybe it is simply have a host problem. But maybe gone. I'll keep an eye out. Perhaps someone here has one they would sell ?
    Thanks,

    Denny Cole
    https://www.facebook.com/groups/Cole...ristmasLights/

    Back to Work <unretired> so I went Static in 2017. Planning xLights when I retire <again>. Maybe 2019 ?

    Falcon - 3 F16V3 & 1 PiCap, Sandevices - 2 E681 & 4 E6804, 288 Channels Lynx Express, 108 Channels DC DMX,
    10' Pixel MegaTree, CoroFlakes w/Pixel Modules, Pixel RBLs, 2 Pixel Matrix 16x25, 10" RGB Ornaments, 7x230 Pixel Icicle Matrix,
    Classic 20' AC Megatree, TIR Destiny RGB Spots, RGB Blowmolds, Wireframes, and Inflatables with External Light Control

  3. #3
    Registered User Tripplett's Avatar
    Status
    Offline
    Join Date
    Mar 2014
    Location
    Cary, NC
    Posts
    468
    Thanks (Received)
    36
    Likes (Received)
    57
    Mentioned
    43
    Tagged
    0 Thread(s)
    Quoted
    165

    Default Re: FM transmitter antenna

    This is the one I built. It cost me about $5 and I am very happy with it.
    http://www.diylightanimation.com/wik...ve_Antenna.pdf

  4. #4
    Havin fun ! kidcole's Avatar
    Status
    Offline
    Join Date
    Jun 2009
    Location
    Clayton, NC
    Posts
    3,964
    Thanks (Received)
    44
    Likes (Received)
    233
    Blog Entries
    2
    Mentioned
    76
    Tagged
    0 Thread(s)
    Quoted
    399

    Default Re: FM transmitter antenna

    Here's one that is similar to the ones we have all been buying.

    3dB Powerful 1 4 Wavelength 88 108MHz GP BNC Antenna for Radio FM Transmitter | eBay

    Even if this auction has ended, there are a bunch of these for sale. Search around because the prices vary widely for the exact same antenna !
    Thanks,

    Denny Cole
    https://www.facebook.com/groups/Cole...ristmasLights/

    Back to Work <unretired> so I went Static in 2017. Planning xLights when I retire <again>. Maybe 2019 ?

    Falcon - 3 F16V3 & 1 PiCap, Sandevices - 2 E681 & 4 E6804, 288 Channels Lynx Express, 108 Channels DC DMX,
    10' Pixel MegaTree, CoroFlakes w/Pixel Modules, Pixel RBLs, 2 Pixel Matrix 16x25, 10" RGB Ornaments, 7x230 Pixel Icicle Matrix,
    Classic 20' AC Megatree, TIR Destiny RGB Spots, RGB Blowmolds, Wireframes, and Inflatables with External Light Control

  5. #5
    Super Moderator EricR's Avatar
    Status
    Offline
    Join Date
    Dec 2015
    Location
    Apex NC
    Posts
    338
    Thanks (Received)
    12
    Likes (Received)
    51
    Mentioned
    26
    Tagged
    0 Thread(s)
    Quoted
    124

    Default Re: FM transmitter antenna

    Quote Originally Posted by Tripplett View Post
    This is the one I built. It cost me about $5 and I am very happy with it.
    http://www.diylightanimation.com/wik...ve_Antenna.pdf
    How did you do this for $5??? Do you have any pictures? It looks really simple but the Romex is over 5 by itself.
    Can this be deep inside a house (aka: attic) and work? Tripplett, I know you said you hung yours from the bedroom ceiling.

  6. #6
    Registered User Tripplett's Avatar
    Status
    Offline
    Join Date
    Mar 2014
    Location
    Cary, NC
    Posts
    468
    Thanks (Received)
    36
    Likes (Received)
    57
    Mentioned
    43
    Tagged
    0 Thread(s)
    Quoted
    165

    Default Re: FM transmitter antenna

    Radio Shack has it for like $4.50. I had one on hand from my ham radio days but I can find them online for under $3. I had the solid wire on hand as well for the radials so really it cost me nothing. I don't have any pictures as it is buried in the attic. I'd be happy to help you build one if you wanted to try. If I can dig it out Of the attic I can bring it to the meeting but it isn't pretty, just functional. Yes I ran a screw up into the ceiling (hopefully into a joist) and tied some string onto it. The antenna is hung from that each year. I keep saying I will mount it in the attic permanently and then just connect the cable come Christmastime. But alas I didn't do that the last two years. Still it gets a great signal out to 1/2 mile easily. I kinda don't want to move it for fear of putting out too much signal but I need my closet this year. Therefore yes it will go in the attic with the cable tucked just inside an access hatch till I need it.
    Thanks EricR thanked for this post
    Dislikes EricR disliked this post

  7. #7
    Super Moderator EricR's Avatar
    Status
    Offline
    Join Date
    Dec 2015
    Location
    Apex NC
    Posts
    338
    Thanks (Received)
    12
    Likes (Received)
    51
    Mentioned
    26
    Tagged
    0 Thread(s)
    Quoted
    124

    Default Re: FM transmitter antenna

    I'm guessing you are referring to the SO239 at RadioShack. I'll get the parts and attempt to build this. The Romex is what is confusing. Are they just using a single solid copper wire from the Romex for each piece? So I could buy less 14/3 Romex and use all the wires inside?

  8. #8
    Registered User Tripplett's Avatar
    Status
    Offline
    Join Date
    Mar 2014
    Location
    Cary, NC
    Posts
    468
    Thanks (Received)
    36
    Likes (Received)
    57
    Mentioned
    43
    Tagged
    0 Thread(s)
    Quoted
    165

    Default FM transmitter antenna

    I used a roll of green solid (12-14g?) wire for the radials. Just pulled the insulation off where needed and straightened it out. But yea Romex will work too.

  9. #9
    Super Moderator EricR's Avatar
    Status
    Offline
    Join Date
    Dec 2015
    Location
    Apex NC
    Posts
    338
    Thanks (Received)
    12
    Likes (Received)
    51
    Mentioned
    26
    Tagged
    0 Thread(s)
    Quoted
    124

    Default Re: FM transmitter antenna

    Does anyone have the Ramsey FM25B. I am trying to verify the tuning voltage at TP1. Where do I touch for ground and positive? Is the positive at the resistor or the little wire by the arrow head? Do you ground at the J3 and if so which solder joint? Thanks.

  10. #10
    Newbie Extraordinaire... scottmcl's Avatar
    Status
    Offline
    Join Date
    Dec 2009
    Location
    Cary, NC
    Posts
    1,138
    Thanks (Received)
    5
    Likes (Received)
    61
    Blog Entries
    6
    Mentioned
    46
    Tagged
    0 Thread(s)
    Quoted
    117

    Default Re: FM transmitter antenna

    I have one, but bought it assembled. If you want to look at it to see, let me know.


    ---------------------------
    - Scott M.

    Sent from my iPhone using Tapatalk
    - Scott M.
    ______________________________
    Newbie extraordinaire...
    LOR user with 108 channels.
    Carpenter Lights: Website; Twitter feed; Facebook page

  11. #11
    Super Moderator EricR's Avatar
    Status
    Offline
    Join Date
    Dec 2015
    Location
    Apex NC
    Posts
    338
    Thanks (Received)
    12
    Likes (Received)
    51
    Mentioned
    26
    Tagged
    0 Thread(s)
    Quoted
    124

    Default Re: FM transmitter antenna

    Thanks @scottmcl. Mine is prebuilt as well. It did transmit clean signal with the whip antenna. I wanted to verify that it was at optimal tuning.

  12. #12
    Newbie Extraordinaire... scottmcl's Avatar
    Status
    Offline
    Join Date
    Dec 2009
    Location
    Cary, NC
    Posts
    1,138
    Thanks (Received)
    5
    Likes (Received)
    61
    Blog Entries
    6
    Mentioned
    46
    Tagged
    0 Thread(s)
    Quoted
    117

    Default Re: FM transmitter antenna

    Ahhh, I just measured mine the first time and locked it down. Somehow I got it right the first time! Though I've carried it to so many events that I think I need to check it again to make sure it's still right.
    - Scott M.
    ______________________________
    Newbie extraordinaire...
    LOR user with 108 channels.
    Carpenter Lights: Website; Twitter feed; Facebook page

  13. #13
    Havin fun ! kidcole's Avatar
    Status
    Offline
    Join Date
    Jun 2009
    Location
    Clayton, NC
    Posts
    3,964
    Thanks (Received)
    44
    Likes (Received)
    233
    Blog Entries
    2
    Mentioned
    76
    Tagged
    0 Thread(s)
    Quoted
    399

    Default Re: FM transmitter antenna

    Quote Originally Posted by EricR View Post
    Does anyone have the Ramsey FM25B. I am trying to verify the tuning voltage at TP1. Where do I touch for ground and positive? Is the positive at the resistor or the little wire by the arrow head? Do you ground at the J3 and if so which solder joint? Thanks.
    Hi Eric. I did not reply to the because so darned much of my Christmas crap is still boxed up from our move last year. Been building another <external> garage since October. I am finally done and signed off. So now I am starting to unpack things. Once I run across the setup doc for the FM25B, I'll let you know the details. Hopefully soon. I remember what the briefcase looks like that has everything in it ! Now I just have to stumble across it. about 60 to 80 boxes to unpack, mostly my workshop.
    Thanks,

    Denny Cole
    https://www.facebook.com/groups/Cole...ristmasLights/

    Back to Work <unretired> so I went Static in 2017. Planning xLights when I retire <again>. Maybe 2019 ?

    Falcon - 3 F16V3 & 1 PiCap, Sandevices - 2 E681 & 4 E6804, 288 Channels Lynx Express, 108 Channels DC DMX,
    10' Pixel MegaTree, CoroFlakes w/Pixel Modules, Pixel RBLs, 2 Pixel Matrix 16x25, 10" RGB Ornaments, 7x230 Pixel Icicle Matrix,
    Classic 20' AC Megatree, TIR Destiny RGB Spots, RGB Blowmolds, Wireframes, and Inflatables with External Light Control

  14. #14
    Super Moderator EricR's Avatar
    Status
    Offline
    Join Date
    Dec 2015
    Location
    Apex NC
    Posts
    338
    Thanks (Received)
    12
    Likes (Received)
    51
    Mentioned
    26
    Tagged
    0 Thread(s)
    Quoted
    124

    Default Re: FM transmitter antenna

    What ever help you can provide would be appreciated. I have the manual and the thing works as of now. I just wanted to make sure it was properly tuned but unclear where to get a ground on the board. I can bring it to the TASL meeting if it will jog your memory.

  15. #15
    Havin fun ! kidcole's Avatar
    Status
    Offline
    Join Date
    Jun 2009
    Location
    Clayton, NC
    Posts
    3,964
    Thanks (Received)
    44
    Likes (Received)
    233
    Blog Entries
    2
    Mentioned
    76
    Tagged
    0 Thread(s)
    Quoted
    399

    Default Re: FM transmitter antenna

    Quote Originally Posted by EricR View Post
    What ever help you can provide would be appreciated. I have the manual and the thing works as of now. I just wanted to make sure it was properly tuned but unclear where to get a ground on the board. I can bring it to the TASL meeting if it will jog your memory.
    Sounds good. Or I will find something sooner.
    Thanks,

    Denny Cole
    https://www.facebook.com/groups/Cole...ristmasLights/

    Back to Work <unretired> so I went Static in 2017. Planning xLights when I retire <again>. Maybe 2019 ?

    Falcon - 3 F16V3 & 1 PiCap, Sandevices - 2 E681 & 4 E6804, 288 Channels Lynx Express, 108 Channels DC DMX,
    10' Pixel MegaTree, CoroFlakes w/Pixel Modules, Pixel RBLs, 2 Pixel Matrix 16x25, 10" RGB Ornaments, 7x230 Pixel Icicle Matrix,
    Classic 20' AC Megatree, TIR Destiny RGB Spots, RGB Blowmolds, Wireframes, and Inflatables with External Light Control

Tags for this Thread

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •