I have been having some issues with Lectrosonics wireless lately and figured the hive mind might be able to shine some light on something I may be missing. I have been in contact with Lectrosonics technical support and currently have my wireless systems getting checked out by their engineers. They have been super helpful and friendly in figuring out what is going on. Now I have access to a different setup and am still experiencing issues.
I have been running into sporadic rf issues the last couple weeks, sometimes lots of clicks and pops, sometimes larger static interference. I have been trying to recreate the issues I have been experiencing without much luck. I have been able to repeatedly get clicks and pops when performing a short walk test along with, to a lesser extent, static sounding interference when a bag is shifted or moved.
For my short walk tests I am using mostly 411a, with one srb. I have mostly smqv, with a couple um400/um400a for my transmitters. I have tested with both a 633 and 688. I have tested powering with an audio root bds, np-1 psc bds, and internal 9-volts (sony L-series powering 633). I have a mixture of pre made xlr/ta3 cables and cables I have made myself. Some of the cables have ground terminated to the chassis.
While performing the short walk test I have been playing a 1khz tone through a cos11d into an smqv running at 100mW. The transmitter is gained up so that the level on the transmitter is just before the -10 light turns red and the limiter is engaged, which corresponds to 0 on my receiver. I have been trying multiple frequencies and alway choose a clean channel without any other signal showing on my 411a scan. I always use freqfinder when coordinating multiple wireless frequencies. I have been walking anywhere between 20 and 70 feet away from the transmitter carrying the bag containing one of the recorders and a receiver. The transmitter and receiver are mostly maintaining line of sight, with the occasional blockage (my body, fence, tree, etc). I am pretty consistently able to get a couple clicks out of any combination of rx/tx/recorder/power within a couple minutes. Some receivers are less prone than others, but all of them will eventually have a click. The click usually coincides with the diversity switching or a small blip in the uV reading. I have also tried this test using music and dialog being played through the transmitter with similar results.
In past posts about clicking lectrosonics it has been said that the clicking is due to low gain on the transmitters. I have noticed that having the gain higher results in less clicks, but does not completely remedy them. Below are the posts I am referring to.
My other recreatable issue is I will get short bursts of static on my wireless channels when the bag is moved or shifted in a certain way. This one has been hard to consistently recreate. It seems to be more likely to occur the more things I have in the bag. As I remove cables/power/receivers from the bag it becomes harder to recreate. A couple times it has been consistent enough where I was able to remove items from the bag one at a time and check if the static would still occur. I was able to get down to just a recorder and a receiver powered with internal 9 volts while still recreating the static. Removing the receiver from the bag by manually holding it up seemed to be the only way to remedy the issue. While the static is happening, it does not seem to correspond to any receiver/transmitter/recorder/cable. I have two bags I have been testing, and oddly the petrol seems to cause the issue more than the stingray. When the issue is occurring I have noticed the receiver is affected by other cables and receivers in the bag. I will get the static sound when moving other receivers antennas or cables. When I touch two pieces of metal together in the bag, such as the casing on two xlr cables, I will occasionally get the static sound. This will happen even if the xlr cables are not connected to the mixer and just sitting in the bag. I am also sometimes getting the sound when an antenna on an adjacent receiver is loosened and wiggled, even when the receiver with the antenna I am wiggling is not connected to the mixer or power supply. A couple times the static has occurred from my hand just touching the zipper on the bag. I am thinking this is the static sounding interference I was hearing in the field.
Included are some examples of what I am hearing. The DIV-CLICK file is a click I was hearing from about 20 feet away from the transmitter with line of sight. The tone being played was around 0 on the receiver, and just before the limiter on the transmitter.
Static_cables_not_terminated_touching is the sound of two hirosi to lectrosonics power cables touching inside the bag. Neither cable is terminated to a receiver or the power supply, the receiver was being ran off of two 9 volts. The tone on this one isn't quite 1khz.
static_bag_move is an example of the static sound I am hearing when the bag is moved. The static would happen when the bag was slightly shaken.
Sorry for the long post, I have been testing for a while and wanted to include as much information as I could. I really appreciate this forum and all the information it has given me.