3/4 of a turn on an N connector is a lot. You were probably loosing a lot of RF out that port.
On Wednesday, February 3, 2016, Dan Petermann <[email protected]> wrote: > We have two 11GHz links on the same freqs. One V and one H pol. These are > dual links, 2 - 40Mhz channels. The radios are Dragonwave, one Quantum and > the other a Horizion Duo. > > We had to replace the IDU of the Quantum with a DUO and put the link into > DUO compatibility mode. > > After replacing the IDU, we started having issues on the other link. The > RX levels of one freq dropped by 9dBm, the equalizer stress jumped to 150 > (should be under 100), and the link would only run at 32QAM. > > This morning I moved the IDU up 1 RU (it was sitting directly onto of the > other IDU) and tightened the coax by 3/4 of a turn. Gained 9dB, lowered > equalizer stress by 50, and now running at 256QAM. > > I check the IF freqs and they were separated by 200MHz. > > I’m curious, does anyone have an idea why this happened?
