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Whenever I cross fc > = 1500MHz with this transceiver, however, I see a significant (>10dB) > change in the noise floor. What is the cause, and what could be done to > suppress (or characterize) such behavior?

Next block is "Buffer" with > size 1000 and final block is "SDRu Transmitter", with Fc-1575.42e6 Hz, > LO offset-0 Hz, Gain-5 dB, Master Clock Rate- 20.95104e6 Hz, > Interpolation- 512 and everything else is default. > > > When i run the model, my GPS evaluation software (U-center) receives > gibberish. Intermittent signal and pseudo satellites.

. > > - However, the second output (ch 1, red in the picture) is lagged from > the first one (ch 0, yellow) by about (~10us with +-4us uncertainty) > > - The baseband burst is a sawtooth waveform of two cycles(2000 samples > long). and UBX160 modulates it into fc = 1GHz whereas LFTX generates it > as is. > > - This lagging is quite constant (10us) even

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There's a FCS paper on it from the 80's(?). Closer to the original topic. The IRIG stuff dates to 1956 according to Wikipedia. There were similar setups running around when IRIG was being worked on. The whole reason for doing it was the proliferation of incompatible gear.

If you want to dig into them, digging into a good index of the FCS proceedings is a good starting point. The crystals shown in the movie were going into pressure holders. The whole stress / strain / frequency thing was well in the future in 1943.

I'm asking because it looks like FC is kicking in and stopping the stream.

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