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Go on line and search for operators manual. You may have an older unit with frequencies that were given away from the AV world to the internet world and this may ultimately be the cause of interference.
Sorry, it's not possible to adjust the frequency of the L4 wireless receiver. These were single frequency, crystal controlled systems. To change the frequency would require changing a dozen components on the board and then retuning the filters on the receiver board to work with this new frequency.
You can tune the ULX system to any frequency you want. But the PGX system is limited to certain groups and channels. It is possible but quite inflexible. You will also run into problems with the different compander and pilot tones within the differing units. With your PGX system you should have got a chart of frequencies which correlate to the frequencies. Match this up with a frequency on the ULX handheld and this should work ok. The "sync" feature will not work you will have to do this manually.
Make certain they are on the same frequency. On the UT4, the frequency will be on a sticker on the back or bottom. On the UT2, the frequency will be on a sticker inside the battery compartment (probably under the battery).
If the frequencies match, then the system will need to be sent for repairs. Call Delta Audio at 773-764-3634 to have it repaired.
If the frequencies do not match, then they will never work together.
The AP1B was designed for the Bass as it gave a lower end signal responce the unit was designed to be intergrated into the effects pedal set up or into the bass itself .. the main difference is in the signal sent has a wider frequency on the bottom end..it now discontinued. according to their site..
There are different frequencies available and being used in each location.
To get a basic idea of which frequencies are available in your area, try this online tool: http://www.sennheiserusa.com/findfrequency/ or use the literature provided with the Sennheiser gear (usually a useful chart comes with the wireless gear).
Also, remember that your transmitting frequencies need to be spaced apart a minimum of .400 MHz (or 400 kHz).
Frequency selection shouldn't cause feedback problems though. If you select a frequency for a mic that a local TV station is already using to broadcast, it will cause RF Interference (Radio Frequency). You'll probably hear static noises, pops, or since your Sennheiser has a Squelch feature, just drop-outs in audio.
So first consult the available charts to find a set of frequencies that should be available in your area. Then, if one of your mics is experiencing such an issue, try moving it .400 MHz to the nearest unused frequency and see if the RFI goes away. Repeat until the RFI no longer manifests.