Question about RCA RTD155 System

1 Answer

How do I hook up a 75 ohm cable to the unit?

My RTD 155 is installed in my motorhome. The FM reception is not good. I want to install a 75ohm cable from the unit to my Winegard RV antenna, but the plug on the back of the unit does not fit the F plug. I bought a PAL adapter from Radio Shack but it is too small to fit over the plug (protuberance?) on the back of the unit. Is there a larger PAL adapter? If not, how do I hook up a 75ohm cable to it?

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  • Henry Morgan Jul 16, 2007

    Techman: Thanks for your help; however, the plug, protuberance, whatever it is called on the back of the unit to which the coaxial cable must connect is too large for an F connector or for the "F to Pal" adapter that I purchased from Radio Shack. In fact, the plug seems to be exactly the same diameter as the F plug. Likewise, the RF part of the adapter that you suggest is too small to fit over the plug in back. Furthermore, I can see no way to attach the prongs of the 300 ohm might attach to. The owner's manual has a photo of the plug on the back of the unit, and it appears to be a PAL connection, but the plug adapter is too small to fit over the plug. Any ideas? Bud.

  • Henry Morgan Jul 27, 2007

    Techman: I owe you an apology. The RF to 300 adapter works after all. My problem was that there is so little space behind the unit in my motorhome that I couldn't get my far enough behind it to push the adapter on squarely. I finally removed the unit (a real task), and the unit fit perfectly. I hooked up the 300 ohm leads with a 75 ohm adapter, hooked that up to my motorhome antenna, and the FM is greatly improved. Thanks very much for your help. Bud.

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You need a simple Male RF adapter to a 300 ohm connection. Go here to see the picture http://www.showmecables.com/productDetailsPopUp.asp?idproduct=1889 and print it out and take it to radio shack and show the salesman there. they will have this part for you for sure. Good Luck

Posted on Jul 15, 2007

  • 1 more comment 
  • Larry  Dillon
    Larry Dillon Jul 16, 2007

    Get the adapter and it will work.

  • Larry  Dillon
    Larry Dillon Jul 16, 2007

    Ok, tell me what the connection your trying to connect to on the back of the RTD155 looks like and what type of cable are you trying to connect to it. I must be missing something here?

  • Larry  Dillon
    Larry Dillon Jul 17, 2007

    I cannot find a picture of this thing, can you post what it looks like please?

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1 Answer

Coaxial FM antenna


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adapter catalog number 278-0291. It takes some effort to push the 278-0291
adapter onto the FM UNBL 75 ohm terminal so wait until you have the 278-0291
installed before you connect your 75 ohm coax on to your new adapter.

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