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?
