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Question about RCA RTD155 System

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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?

Posted by Henry Morgan on

  • 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 
  • Anonymous Jul 16, 2007

    Get the adapter and it will work.

  • Anonymous 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?

  • Anonymous Jul 17, 2007

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

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INSTALLATION

Channel Master by PCT indoor antennas are designed to provide optimum reception of

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hassle-free connections to today's newer TV sets that have 75 ohm F type connector

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(Fig. 2). Some adjustment of the antenna might be necessary for optimum viewing.

Model CM-4030 includes a built-in amplifier and separate power supply.

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Google 4030 Channel Master Instruction Sheet for the PDF File with the diagram.







Fig 2a
Fig 3 Fig 4

prohibido por ley.

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Fig 1 VCR

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Coaxial FM antenna

Radio Shack has an
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.

This will resolve your FM screw on F connector antenna interface issue.


I see others trying to
help suggest using a 300 ohm to 75 ohm transformer match unit, this isn't what is needed. Your receiver antenna input IS a 75
ohm input.
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HAVE A MEGALOOP+ hearing aid SYSTEM. THE SOUND FROM A NEW DIGITAL TV IS DISTORTED CAN I ALSO PLUG IN A MICROPHONE TO USE WITH THE NORMAL SCART ATTATCHMENT IF SO WIRING INSTRUCTION PLEASE

I would imagine the level is too high. Does your loop amplifier not have a sensitivity control?
You could come out of the scart socket but check for a headphone volume control first!

The connection standard requires that the pins are utilised in the following manner:


Hope this is useful.

scart.gif PIN USE LEVEL / IMPEDANCE 1 Audio Output (R) 0.5V / 1K-ohm 2 Audio Input (R) 0.5V / 10K-ohm 3 Audio Output (L) 0.5V / 1K-ohm 4 Audio Ground -------------------- 5 Blue Ground -------------------- 6 Audio Input (L) 0.5V / 10K-ohm 7 Blue 0.7Vp-p / 75ohm 8 Status (CVBS) L:0-2V H:10 - 12V / 10K-ohm 9 Green Ground -------------------- 10 Data D2B (Inverted) -------------------- 11 Green 0.7Vp-p / 75 ohm 12 Data D2B -------------------- 13 Red Ground -------------------- 14 D2B Ground -------------------- 15 Red 0.7Vp-p / 75 ohm 16 RGB Status/Fast Blanking L:0-0.4V H:1-3V / 75 ohm 17 CVBS Video Ground -------------------- 18 RGB Status Ground -------------------- 19 Composite Video Output 1V / 75 ohm 20 Composite Video Input 1V / 75 ohm 21 Case Shield ---------------------

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Where can I find an antenna for this unit?

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http://www.radioshack.com/search/index.jsp?kw=fm&f=Taxonomy/RSK/2032189&categoryId=2032189&kwCatId=2032057&fbc=1&filterName=Category&fbn=Taxonomy/Antennas

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http://www.amazon.com/Parts-Express-Push-On-Balun/dp/B0002ZPIOQ

or to go the other way - from 75 to 300 (cable to terminal) ohm balun like this one:

http://www.amazon.com/75-300-Ohm-Matching-Transformer/dp/B0002ZPIOG/ref=pd_bxgy_e_text_c

Please rate this reply if you found it helpful. Good luck!

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Fm Radio signal?

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