BTW...I hold an FCC Amateur Radio Extra Class license (AH6TA), and made my living playing live music for a number of years in the early 70s. Happy to address the issue. I've a couple of thoughts.
I'm assuming you're also using wireless speakers, re. the intermittent static issue with the one of the three. It might be helpful to know, if they are wireless, what frequency they operate on. If it is in the same band, that can be a problem both with the speaker(s) and with the mics.
A basic concern here is that the Nady system operates in the VHF spectrum of 171-216 mhz. This band is in close proximity to standard over-the-air TV signals, More specifically, the frequencies you are using are shared by TV channel 11 (202 mhz) and channel 12 (209 mhz). This band is also used by some older wireless telephone systems, This general spectrum is also used by marine radio, and some older first responder localities.
There is also the possibility that someone within range (around 200 ft or so) is using a similar system (not necessarily Nady, but perhaps on the same band).
So...the opportunity for RFI (Radio Frequency Interference) in this band is significant. RFI can be very elusive to track down. The first suggestion is to, if the speakers are wireless, determine if the band is similar to the mics'. If so, try swapping to hard-wired speakers to test and see if the static disappears, and/or if the problem with the 209.15 mhz mic disappears. If so, then you're faced with the decision of changing either the speaker configuration or the mics.
The second suggestion is to search for possible interfering devices; old wireless phone systems, neighboring wireless mic/speaker systems, etc. If found, try disabling/turning off (unplug) those systems and see if it helps your issues. If not, you're pretty much out of luck as the interference source may be unidentifiable. If your problem occurs in multiple physical venues, this may not be a helpful exercise, although VHF interference can occur just about anywhere that there is electronics.
The third suggestion is not (I'm sure) what you want to hear. You may want to consider switching to a pair of Shure wireless mics (they use separate receivers, but have dozens of available channels) that operate in the much more stable 900 mhz range. The only RFI issue I've seen in these mics is when someone nearby is using the same channel...and it's a simple and quick task to change the channel on any given Shure mic to "get away" from the offender. Maybe you can find someone with a set and borrow them for test purposes.
I hope that is helpful.
Thanks for the clarification re "speaker." ;-)
There is an "Input Level Control" on top of the WGT. Page 11 of the manual defines this as where to set the gain. Here's the link for the manual if you have misplaced it.
As odd as it may seem, it is true that some persons have trouble with electronic devices, for varying reasons (I have a best friend who is one of them). Individuals have widely varying galvanic properties in their skin. A high galvanic value can cause odd operation in a mic or walkie-talkie, for example. Additionally, if the person is holding the mic too close to their mouth, it can overdrive the modulation and cause the connection to cut out and/or distort...but not necessarily feed back. In either case, decreasing the gain may help, but may make it more difficult for another person to use the same mic.
It's beginning to sound like this is less of an RFI issue than one with signal propagation (ie., being compromised by normal usage issues), which is a matter of design rather than circumstance.
I'm sorry if I cannot offer you a better explanation than this. I've been doing sound work since 1965, and have often run into similar problem situations that sometimes defy easy explanation.
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This usually happens when you keep your microphone too close to the speaker. Does this happen also when you keep you distance from that speaker?
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The room we are in isn't very large (maybe 30' by 50'), but this happens no matter where this individual stands in the room with the speakers a minimum of 10 feet away and a maximum of 30 feet away from the closest speaker. I guess I can try repositioning the speakers, but it doesn't seem that distance has anything to do with my problem.
This is definitely not a speaker feedback issue. I have experienced feedback with these mikes and it doesn't sound like static. If I were to guess at the cause, the two items I would suspect are gain and external interference, but I'm not sure how to set the gain and I have no way to test for external interference. Of course, none of this explains why it happens for one individual and not the other two... It's almost like there's something about his internal electrical signals that is causing the problem, but that doesn't seem right to me either.
I should clarify - when I say one of three speakers is having a problem, I am talking about a person. There are three of us who use these microphones regularly and one of the three continues to have problems while the other two do not. The speakers (that is, the sound-producing boxes) are hard-wired, so that eliminates one of the variables you wrote about. We are in a residential neighborhood, so tracking down an external source of interference is pretty much out of the question. Perhaps it is just the "nature of the beast" as far as these mikes are concerned. If so, the only way I would know for sure is to purchase something better. Kind of hate to spend the money, but if that's what it takes, it may be my only option...
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