A note to Hal That was a wonderful example of "kitchen table" research, well done.
Have you considered using sound-cards to use as a 2 channel oscilloscope for each of pair of monitored channels? Four channel cards are not too expensive to really simplify things. Some scope software have pretty versatile data capture options, and best of all, there are several software packages that are free. Their crystal controlled clock, low jitter and 44.1Khz to 192Khz sampling rate at 16-24 bits makes for some pretty high res measurements. Some sound cards even handle DC. An AC-only input can be used if the slower measured signal is gating a known HF signal(, in duplex mode the sound card provides any AC signal you want, makes pulse width measurements a snap by just counting the carrier transitions under a measured pulse.
I have the needed test equipment but not enough camera gear to duplicate your experiments using a 4 channel DSO or logic analyzer. The logic analyzer would need photo-transistor sensors but that would be a simple to create optic>logic level signals.
My TEAS(Test Equipment Acquisition Syndrome) overpowers my NAS. Good used test equipment is cheaper than good camera gear. There are exceptions, my RF service monitor cost me 3 times what a D3X costs. That could have gotten me a few good lenses, which right now I would probably use more often.
I built my own wireless triggers (and studio 600w/s strobes) but have hardly used them since a week or so after I built them in the fall. The SB900 and Sigma 530Super do everything I need(or can afford) right now.
By the way, for low power signaling, there are overlapping RF spectrum in the 3 main markets, which means MMCs are dirt cheap for those frequencies as the entire RF section of a wireless system.
Maybe you need a few less SB800s and I need one less HP DSO:>)