Question about Radio Shack Video RF Modulator. 15-1244. New. Channel 3 and 4

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Rf modulator busted. won't work.

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So what is your question? they are cheap so I would just buy another one. it would cost to much to fix it.

Posted on May 17, 2014

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1 Answer

Transmits and receives no modulation out


I am not an expert but I think there can be little or no modulation of the carrier wave unless there is an audio input to the modulator. Like any audio amplifier a transmitter modulator (amplitude modulation) is quiescent without an input.

If the modulation amplifier and audio pre-amp are working and modulating the carrier wave and the antenna is ok then audio modulated radio frequency must be being transmitted.

It would be an extremely good quality CB that had a modulation meter. Mostly all they have is a meter giving an indication of the rf power being sent to the antenna and that rf (radio frequency) power would be the same whether modulated or unmodulated.
The modulation envelope, incidentally, is traditionally viewed or measured with an oscilloscope.

The indicated rf power could be verified using a field strength meter but the only practical way to discover if a standard CB is transmitting modulated rf is to listen to the transmission on a suitable receiver. If the squelch is turned down it will be obvious if the rf carrier wave is being received as the hiss would be silenced. If no audio is received it can be assumed none is being transmitted.

I suggest you try another microphone and lead and if that doesn't work it is clearly a job for a repair shop.

Oct 28, 2015 | Radio Communications

2 Answers

Own Atari 2600. Atari not responding to television. (FUZZY SCREEN) One of three problems: 1. I AM NOT CONNECTING SYSTEM CORRECTLY TO TV. please instruct me how. parts i have are: Radio...


Hello!

When powering the stuff there should be light indicated that there is a power on it. how ever if these not been observed, power adapter maybe busted. try to fix it or replace it. Please refer to the atari manual for the correct operation of your stuff.

hpe this help,
melnavz


Mar 14, 2008 | Video Game Consoles & Games

Tip

RF Modulators and cable connections


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RF MODULATOR HOOKUP
For a TV with only a RF input jack, a RF Modulator can be used to hookup DVD players, DVD recorders and other devices which output RCA composite video and audio. For example, analog cable TV can be connected using a RG-6 type coaxial cable to a VCR or older DVD recorder's analog cable ready tuner RF input. Then as shown above, the output can be connected to the TV thru the RF modulator. The modulator outputs on channel 3 or 4 for the older TV so the TV is set to channel 3 or 4. Some RF modulators are built-in to Audio/Video switch boxes. These allow multiple RCA inputs along with RF input.

3b00cff.jpg


RF MODULATOR CLOSE-UP
The modulator converts signals to channel 3 or 4 so older TVs can tune them on their analog tuners channel 3 or 4.

RF Modulator - buy online
http://sewelldirect.com/belkin-rf-modulator.asp

on Aug 23, 2010 | Audio Players & Recorders

1 Answer

My wii u stil wont work after being hooked to an rf modulator to an older tv


Hi Lisa can you provide some more information
What is the model number and make of the rf modulator?
what wii output did you use to go into the rf modulator ?
what frequency does the rf modulator output at ?
What model number and make is the television ?
What type of cable is being used from the rf modulator to the tv ?
Is it a video cable or a proper 75 ohm impedance coaxial cable
what is the impedance of the rf modulator output is it 75 omhs and what is the impedance of the tv is it 75 ohms or is it 300 ohms if it is 300 ohms on the television ( usually antenna is a ribbon cable screwed onto the back of the tv rather than a coaxial socket ) different you need a balun
http://www.jaycar.com.au/productView.asp?ID=LT3022
I am recommending your first point of problem trouble shooting first is to check the impedance of your television compared to the impedance of the rf modulator and compared to the impedance of the cable used. IF they do not match then power is lost and the signal won't get to the TV.

Dec 27, 2014 | Nintendo Wii U

1 Answer

My RF-modulator works when I use a short coaxial cable but will not work on longer runs. Why?


RF modulators are intended for short runs. There is too much signal loss for a long run

Dec 17, 2012 | GE Rf-modulator 73452 Connects All Kit

1 Answer

I'm trying to hookup my Toshiba DR430KU to an older tv that require an RF Modulator. I get a skewded sideways picture. Does This DVDR compatable with a RF Modulator?


Probably not. Better picture results are achieved with either S-Video, standard RCA AV cable (yellow-white-red), or YUV component cable (red-green-blue) (component output does not have audio - this requires extra cable to be connected). The video via either one of these 'AV' connections is stunning (based on a standard 16:9 LCD TV using a Panasonic DVD recorder).

RF tends to be lower quality - as opposed to AV/digital input. AV input/YUV component handles digital better. No one connects their DVD devices to their TV via RF (either directly to the antenna socket or with a modulator/attenuator) anyway. Because a VCR is mostly analogue, it will work fine with an RF connection, but DVD is digital, and so won't work as well, if at all.

RF also goes through the tuner in a TV, creating cross-interference, whereas AV is a direct input and is separate to the tuner.

I would say an RF modulator would not be designed to handle the output frequency that your DVD device generates. Throw the modulator out, or perhaps get another TV, or use RCA cables instead if the TV has AV inputs. Whichever is cheaper and easier, but don't use RF accessories except a standard antenna if/as required.

Apr 27, 2011 | Toshiba DR-430 DVD Recorder

2 Answers

Connecting magnavox dvd/vcr player DV220MW9 to a 40 year old TV


What type of Inputs do you have on your TV. (ANT IN, S-Videio, RCA Video,RCA Audio)

If you only have a ANT In or RF Coaxial hook up you will need a RF Modulator

Jan 03, 2009 | Philips Magnavox DVD/VCR Dual Player

1 Answer

Snowy image


Your going to need the manual RF modulator to get the sound out because it works off of a different output than the newer ones do. The 2600 runs a closed circuit TV signal to the modulator. In fact there is a small TV transmitter in the game unit.While most electronics today send a seperate audio and video signal. So a modulator that plugs into the electrical outlet won't do the trick.

I found this page on the internet. Look at the RF Option section and see what you think of those options:

http://www.cheeptech.com/2600mods/2600mods.shtml#rfoptions

Jun 29, 2008 | Atari 2600 Console

1 Answer

The video/audio outlet port is busted


okay..... nobody else knew what to do so heres what i did and it works. i bought an rf modulator. i hooked it up to the tv, bypassing the original a/v ports (the modulator has new a/v ports) turned the tv on to the channel i selected on the modulator, and now i have audio and video again.... not sure why my video ports went out in the first place (on 3 tvs-see prior posting by me) but at least we can play games now without buying replacement tvs. good luck!

May 22, 2008 | Nintendo Wii Console

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