Michael, Keita, Dick G

We received the 4 port RF combiner today and were able to install it in the H1 electronics room. I measured 17.3 dBm going into the TTFSS LO inside the laser room with no attenuation. The common gain was lowered from 18 to 15 dB to give a UGF at 415 kHz with 55 degrees of phase margin.

We then tried to adjust the notch at 790 kHz but in the process I appeared to have crushed the variable capacitor and had to replace it. While tuning the notch back to 790 kHz with the new capacitor we noticed a peak around 1.6 MHz with a notch just off it at 1.8 MHz. We brought the notch to 1.6 MHz to compensate for this peak using a variable capacitor labeled in the attached picture.