On 16 Aug 2014 at 12:48, paul swed wrote: > > As a test this morning I connected the fluke 207 vlf radio that has a 1.1KHz > IF > out to a XY scope using a very stable 1.1 Khz synth function gen. Indeed the > msk > is a classic 4 corner eye pattern.
Kewel. > Also I looked at the tracor 900 de-MSK-r > option and they split the path and create a new signal that according to > calculations would be 180 degrees and then sum it with the original. But from my VERY preliminary glance at that schematic, it looks as though the signal passes through two op amps. Doesn't the phase through any amp change by 180 degrees? Therefore, through two op amps, it would swap a full 360, which would equal zero at the output?. > That is > perplexing as that would be 0. They do pass it through a 100 Hz BPF. I wonder > if > in reality the phase shift is 90 degrees and then summed. Its not really > making > sense as to how that gets rid of the MSK. No description either. But it does > some how because that signal is simply re-inserted into the 100Hz IF that > feeds > the phase detectors and correction/locking circuits. Lets see if the diagram > of > the tracor d-msk-r will come through It did. Thanks. Ken W7EKB _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
