#2 RF light on all the time regardless if mic is on

I would prefer to hear it to be sure which one it is, but the four biggest causes of noise in a wireless system are: 1) Something hitting the mic (check to make sure the mic is free of clothing, other people, faces, etc.) 2) If the mic is a lavalier or in some way has a cable that plugs into the transmitter, something pulling on it could create a loud noise. Check to make sure it's in snug. 3) RF Interference with another mic or some other interference source. Try changing the frequency. 4) Something blocking the signal between the transmitter antenna and the receiver antenna. This is most likely to happen with a lavalier in someone's pocket or under clothing, and/or if the transmitter is far away from the receiver. The SLX series is okay for what it is, but part of why it's on the cheaper side is because of its limited distance. Unfortunately the only ways to alleviate this are to a) Reduce the distance, b) get a stronger wireless system, c) move the transmitter somewhere that the antenna is free, and d) invest in True Diversity antennae for the receiver.

The FT-840 uses a die-cast RF power amp with thermally switched fan to ensure full power output (up to 100 watts). The digitally synthesized local signals ensure clean, low-noise transmitter output on all HF amateur band. There might be no AC line interference. it has strong Rf output. any AC line intersect does not affect its radio performance. Check and adjust RF power so to maintain proper output. some times more RF power generated at the output may cause interference. adjust Rf power..Even some unfiltered Noise getting the other end of the end may calso cause interference. Check for any Ripple voltages present at the output. Contact authorised service station for further Rectification. thank you shanth

Hi
cordless mics consist of the following parts:
mic capsule- audio and copression amp- Xtall and RF section.
In your case RF is ok. Test mic capsule ( using an audio amp or simply connect it momentarily to a 1.5 vollt battery and listen for a "khesh" noise from your capsule. If your mic capsule is ok your amp and compressor section is either damaged due to a reverse battery connection or you have " cold solder joints" on or around the audio amp. E mail me if you want further information at: [email protected]

Yes, try that. It is easy to do and doesn't cost anything. You've tried new batteries in the remote as well right? There are two types of remotes, IR (Infrared light LED is used) and RF (Radio Frequency). With an IR unit I do not see any way there can be interference as long as you don't have an IR lamp around the TV and TW DVR box. On the other hand, with RF, depending on where you live and other factors, there could well be RF interference. You'll have to locate the interference and remove it. In this day and age, things such as LED and CF light bulbs DO cause RF interference. If you use these kinds of lights in the room AND you know that the remote is an RF remote then try turning all the lights off in the room and try again.

After installing the antenna, follow these steps to adjust the
standing wave ratio(SWR).
1. Turn on the CB.
2. Set S/RF/SWR/CAL to CAL.
3. Key the Mic and rotate SWR CAL so the meter points
to CAL.
4. Unkey Mic.
5. Set S/RF/SWR/CAL to SWR.
6. Key Mic again and note the actual measurement on
the SWR scale. Refer to the following table to interpret
the reading.

1:1 - 1.5 Great
1.5 - 2:1 OK
2:1 - 3:1 Not So Good
Higher than 3.1:1 Terrible

The ideal standing wave ratio (SWR) is 1:1, or a meter
reading of 1 on the SWR meter's top scale. A SWR ratio
of 1.5:1 to 2:1 is excellent for most mobile CB antenna
applications.

Check the SWR on Channel 1 and Channel 40
If the SWR is higher on 1, make the antenna longer
If the SWR is higher on 40, make the antenna shorter
Most antenna's are adjustable. Make small adjustments at a time.

LA 900? I am guess that is a linear amplifier. If so are you running a power mic? You are probably getting RF feedback. You need to turn the gains on the radio and mic down.

Some things you can try. Hold the mic cord in your other hand in the center of the cord while you key it. some times this will shield it form stray RF.

You can also get a bunch of RF chokes from radio shack. They are little black things you snap onto wires that shield form RF. Put 2 near the plug, and 2 near the mic. That will help shield it from RF.

you will most likely still have to play with the gains on the radio and mic to find a sweet spot where it doesn't squeel.

your swr setting are off wack fix your swr

RF gain should be all the way up. Turn the squelch all the way down. Turn the ANL/NB to just ANL.

Turn the dynamic up at least 3/4.

Once you have confirm you can receive and transmit, then you can turn up the squelch up until white noise just stops.

Make sure you are on 19 by the highway. Key up and say break break one nine, can some one give me a radio check please.

you should get a response.

Your RF gain is how much you receive. the higher it is the more you receive. In normal operation there is no need for it ever to be less the all the way on.

Squelch is just to knock out fuzz, and if you only want to hear people close not far. A little less then half way is a basic setting.

the ANL switch is the automatic noise limiter. if you have interference from your vehicle, like engine noise, turning this on will quiet that. If it is extreme engine noise then switch it to NB, noise blanker. It is just a more intense setting.

your dynamic is how loud your audio is. if its low or all the way down, you will not transmit audio loud enough for people to hear. If its a stock radio and has not been tuned, if you turn it all the way up, that is fine.

Hi kb

That is an odd encounter, and most probably one of the R.F.I. kind. Radio Frequency Inference can be caused by many things. Sometimes it can be a nearby piece of equipment creating that much interference, that the mics could not operate. It may have been a spurious mobile radio transmitter as used with two way radio for the cops, ambo's, firies,or even a nearby Cab!! Some times faulty light dimmers can also spray RF.
To what ever end, the fact that 4 mics went down together is indicative of an external problem, and being radio mics, it would have been radio interference.
The only other thing to check is that they are UHF. there are many VHF mic systems still about, but these frequencies are now being used as part of the soon to be introduced digital TV transmission. Best check that they are UHF, The VHF type have actually been illegal for a number of years Hope this info has helped you understand your problem. I am happy to answer any questions you may have. Cheers

regards
robotek

That's almost always due to RF interference from an electric motor. It doesn't even have to be close to your TV, just operating on the same circuit or near a poorly insulated wire, which acts as an antenna, injecting 60Hz (and harmonic) noise into the power supply.

If it's right next to the TV it will be even more pronouced because the RF interference resonates into the TV circuitry itself, not just the power supply to the TV.

Typically a high current AC motor like a vacuum cleaner, refrigerator, dehumidifier, air conditioner, furnace, etc.