Nady 151 Wireless Problems

GoodOlBoy

New member
I recently added a Nady 151 wireless to me homemade e-caller. I bought the unit used off of E-bay and I am wondering if I got ripped. I am getting a lot of "white noise" with the unit. I have messed with the adjustments but can not seem to get acceptable results. I also get a lot of loud static noise on the speaker side as I move the transmitter around. Any ideas on how to improve this sound quality or did I get a bad unit?
 
When I hooked mine up for Halloween, I was having somewhat the same problem... Speaker was really 'scratchy' and loss of signal a lot of the times...(I have an older JS Preymaster with a NADY 151 wireless)

I went through and replaced every battery, even though some of them were new and tested "OK", double checked the wire plug-ins, and tinkered with the volume controls previously...

After the battery replacement, it worked great...I switched from the Energizer to DuraCells..
 
It'd be nearly impossible to diagnose this only from what you've told us so far. So, before you decide you've got a bad wireless mic set, a few questions first:

What player device are you using? Cheap ones (and even some not as cheap ones) can have a low signal-to-noise ratio that won't stand much of any amplification before noise/static is apparent.

Did you use shielded (microphone) cable from the Nady Rx to the amplifier? If not you may have added an antenna, now picking up noise (also shielded cable can be helpful from the player device to the Tx, but not usually as critical). Is the antenna wire on the Rx broken, perhaps? Does it work as it is supposed to when the Tx and Rx are in closer proximity to one another? At what distance are you reporting static? I get a hundred yards out of my set, but this is with good line of sight, and not with both units laying down on the ground or behind rocks.

What radio frequency is the Nady set you're using? Is there a local conflict-- (say with a TV station, which share the same frequencies)?

Did you test all the pieces of your ecaller separately-- have you narrowed it down to this only occurring when you've got the Nady set connected?

Do you have good, clean connections everywhere? A grungy headphone jack on a player device can wreak havoc (not uncommon, though). Try some tuner cleaner or DeOxIT if you're unsure.

LionHo
 
LionHo

I am using an MP3 Player. I been using this MP3 player attached directly to the amp up to this point and the sound has been clean.

For a cable from the Nady to the amp I am using a 6' Radio Shack cable, part Radio Shack #42-2387.

The antenna wire appears to be OK.

I get the static noise no matter if I am close or further away.

I'll double check connections this evening and see if I can spot anything.
 
I did some more playing with the system last night. I get static as soon as I turn on the receiver without even turning on the transmitter. I have played with the gain and mute settings but the make no difference. All connections seem to be good. /ubbthreads/images/graemlins/confused1.gif
 
how far are you turning the power wheel on the receiver side? back when I used the 151 to make my pm3 wireless I noticed I only need to turn the wheel about 1/4 turn, anyfarther an I could hear a hiss in the background.

t/c223encore.
 
GoodOlBoy, two things. I'm guessing you bought a longer cable from the Rx to the amp than you need, and that it's not shielded. This could even be acting as an antenna for noise generated by the amplifier and fed back through the Rx. Theory gets a bit complicated, but the fix might be something as simple as shortening up the cable and using shielded cable.

Also, without first scanning the particular frequency for interference, and with the luck of the draw on a used microphone set, it's just too easy these days to get frequency conflict. Digital TV uses the same frequencies as these old analog microphones.

Without having heard the static (digital TV will sound like static, not voices), it's not easy to diagnose the problem at a distance.

(Re: interference, there's been a Techpage up on Predator Masters for more than 5 years, describing how to mostly avoid this. But now the situation is only likely to worsen in the next year or so, with yesterday's FCC ruling allowing the use of "white space" for new internet wireless devices).

LionHo
 
I read the specs on the cable that I have (Radio Shack 42-2387) and it says that it is shielded. It is a little long but it is the shortest I could find. Any direction on where I could find a shorter one?
 
Quote:
...and it says that it is shielded.



Do you have it attached to ground on both ends? It needs that to provide actual shielding. A problem like that is hard to fix without having physical access to it.
 


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