Question about Sears Craftsman LiftMaster Chamberlain Garage Door Opener Wireless Keypad Model 976LM Security+

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SOMBODY KNOWS , WHAT KIND OF RF MODULATION DOES HAVE A 973-315 LIFTMASTER REMOTE CONTROL ? COULD BE A FSK MODULATION ? THANKS

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Posted on Jan 02, 2017

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SOURCE: garage door remote control signal problem

On the rear of the motor unit just to the left of all those white wires you will find a small LED. Random flashing is normal but if it is flashing rapidly it shows some type of interference. If this isn't happening then the most common thing is a logic board going bad.

Posted on Sep 01, 2009

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SOURCE: Craftsman motor and Liftmaster Remote Control

Some will work and some wont. If you go to this website it will tell you.
You must have the model number off the motor unit of your opener. It is on the end closest to the door and starts with 139.

Go to this website and find your model number in the left column. The second column is the model number of the Liftmaster remote that works.

http://www.geniedoor.com/sears-liftmaster-and-chamberlain-cross-reference

Posted on Feb 09, 2010

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SOURCE: Liftmaster Model 51 for 315 needs replaced. Does

This may help.

If you look on the back of the motor head, where the terminal strip is located, you will either find a set of numbered switches (1 through 9) with +, 0, - settings, or a colored square button. If you have the numbered switches, you want the 61LM model transmitter. If, instead, you have a colored, square button, check to see what color the indicator light, adjacent to this button, emits when it is pressed. If the indicator light is the color green, you want the model 81LM remote transmitter, if the indicator light is an amber color, you want the model 971LM transmitter.

Posted on Feb 22, 2010

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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.

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1 Answer

CAN YOU PICK UP Nexedge frequencies and decode them to listen to them?


Nexedge uses 4-level FSK modulation that cannot be monitored on any scanner. For more information on the Nexedge system, visit:
http://wiki.radioreference.com/index.php/NEXEDGE

Bill B.
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1 Answer

Garage door remote control signal problem


On the rear of the motor unit just to the left of all those white wires you will find a small LED. Random flashing is normal but if it is flashing rapidly it shows some type of interference. If this isn't happening then the most common thing is a logic board going bad.

Sep 01, 2009 | Sears Craftsman LiftMaster Chamberlain...

2 Answers

URC-9910 remote: The RF part for this remote stopped working.


I have the same remote as yours and occasionally the RF remote is not working due the interference signal from outside or next door at certain hours.
My suggestions:
(1) To relocate the receiver and reposition the anntena for better reception of the RF signal from the remote unit.
(2) Replaced the battery.

Hope these help!

Aug 04, 2008 | One For All URC-9910 LCD Remote Control

1 Answer

John Q president cb


Hi,

If by calibration, you are referring to the check if your antenna is tuned, below information may be of help.
S/RF/SWR/CAL SWITCH. When in the S/RF position, the meter swings
proportionally to the strength of the received signal. When transmitting,
the meter indicates relative RF output power.
When in the "CAL" position, the SWR meter can be calibrated by adjusting
the "SWR CAL" control to the "CAL" mark on the meter face.
When in the "SWR" position, the standing wave ratio is measured.

SWR METER. Measures standing wave ratio of the antenna system.
Used to properly adjust the length of the antenna and to monitor the
quality of the coaxial cable and all RF electrical connections. If there is any
degradation whatsoever in any of the foregoing, due to humidity, salt
spray, vibration or corrosion, the SWR meter reading will rise, thereby
indicating that a problem exists.
To calibrate, switch to the "CAL" position, transmit by pressing the mike
switch, and adjust the SWR control to the "CAL" mark on the meter; then
switch to "SWR" position for the SWR measurement.

If however you are referring to the internal calibration or tuning of the transmit and receive sections, you would need several instruments/equipment such as RF generator (0-30Mhz with 1Khx modulation), Spectrum Analyzer, Modulation Scope, Dummy Loaded Wattmeter, Frequency Meter and some others. These of course are not readily available to the average user.

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards.

Thank you for using FixYa.

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Dynamic entertainment system mx3000


what kind of battery does this thing take?

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1 Answer

Set top box and remote control


I have the same problem. When I move the 8300HDC away from the TV, or power off the TV, the remote responds. There seems to be some kind of RF interference, which makes no sense since the TV shouldn't emit RF, and the the box should be using IR only for remote input. My TV is a 46" LCD Samsung. Try turning off the TV and see if the 8300HDC responds to powering on and off with the remote.

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3 Answers

TV does not respond to Remote


possible defective rf receiver led defective in the tv.

Nov 21, 2006 | Toshiba 32AF43 32" TV

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