Dual Sennheiser RS140 Operations

seekermeister · 28 Dec 2010

I have one of these headsets connected to each of my computers, and I frequently am listening to one rig, while working on the other. For the most part, this works fine, except when something on the "silent" computers peeps or squeaks. This activates the transmitter on the rig that I don't want to hear, which causes interference with the signal from the other. It then remains active for a minute or two.

I know that I can mute the rig, but I'm not sure that will work, because I noticed that when I had shutdown one rig altogether, that it's headset transmitter sent out random signals. The only way that I can think of to prevent that, is to unplug the transmitter, but that would not be convenient. Anyway, I'm just looking for the best and most reliable way to manage this situation.

Johnathan Lyman · 29 Dec 2010

seekermeister said:

I have one of these headsets connected to each of my computers, and I frequently am listening to one rig, while working on the other. For the most part, this works fine, except when something on the "silent" computers peeps or squeaks. This activates the transmitter on the rig that I don't want to hear, which causes interference with the signal from the other. It then remains active for a minute or two.

I know that I can mute the rig, but I'm not sure that will work, because I noticed that when I had shutdown one rig altogether, that it's headset transmitter sent out random signals. The only way that I can think of to prevent that, is to unplug the transmitter, but that would not be convenient. Anyway, I'm just looking for the best and most reliable way to manage this situation.

If they're on the same frequency (which it sounds like they are) there's not much you can do besides cutting power to the offending transmitter altogether.

seekermeister · 29 Dec 2010

Actually, they have 3 frequencies, which can be manually selected, but I have then set on two different frequencies, yet the problem remains. The headsets have a tuning button, which is used to let it return itself to the active frequency, but I suspect that there is a defect of some kind, because the interference occurs even when that tuning button is not touched.

Johnathan Lyman · 29 Dec 2010

seekermeister said:

Actually, they have 3 frequencies, which can be manually selected, but I have then set on two different frequencies, yet the problem remains. The headsets have a tuning button, which is used to let it return itself to the active frequency, but I suspect that there is a defect of some kind, because the interference occurs even when that tuning button is not touched.

It also depends on how far apart these frequencies are and how much deviation and bandwidth the device is using on the frequency. Example: 2250mhz, 2255mhz, 2260mhz. Device 1 using 2250 with a spread of 12mhz (+/-6mhz) Device 2 uses 2255mhz. 1 and 2 will overlap by 2mhz total and interefere.

seekermeister · 30 Dec 2010

I just checked the manual, and it says that:

RF frequency range: 863 ... 865 MHz or 926 ... 928MHz

So I assume that the frequency spread is 63Mhz, since one transmitter is set to the far left, and the other to the far right.

Johnathan Lyman · 30 Dec 2010

seekermeister said:

I just checked the manual, and it says that:

RF frequency range: 863 ... 865 MHz or 926 ... 928MHz

So I assume that the frequency spread is 63Mhz, since one transmitter is set to the far left, and the other to the far right.

Then I'm out of ideas.

The only test I can think of to do now is to separate the Tx/headphone sets completely (say other ends of your house/flat/apartment/condo/cardboard box/tree house/cave/basement/crater and see if it still happens.

As a part of FCC Rules Part 15 (in America) the devices can and may receive interference from other RF devices either intended or not. Maybe just having two of them so close together just doesn't work...

In other words, I'm stumped.