[ED by KA, catalogs should not be put on ELOG. This is public.]

Did we just miss this all along?

C30642 has a bandwidth of 20 MHz only. That means at 36 MHz and 37 MHz, the RF output would be -8.1 dB (0.3933) and -8.3 dB (0.3827) lesser than expected or maybe worse. However, this bandwidth is mentioned for load resistance of 50 Ohms, so I need to go into more details. But definitely will have to look into this.

Maybe we need to replace these with faster photodiodes. Do we have any of C30619 or C30641 in stock?

(NO - this is a incorrect interpretation of bandwidth in this case)