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Upsamplers, DACs, jitter, shakes and analogue withdrawals, this is it.

You don't need 75ohm connectors!

That is below 96khz. You need to take into account the wave length of the signal. At 96khz or below, it's longer than the physical length of the connector. Therefore any impedance mis-match is irrelevant.

Case in point. During the dya of analog NTSC video, with a max bandwidth of about 6mhz, we used 50ohm BNC connectors as well as 50ohm patch bays.

Now when we satarted using digital video at 270mbs or 143mhz, The connector impedance became more critical. Yet you still could get away with 50ohm parts in many cases.

When we got into HDTV digital video at 1.5gbs or 745mhz, true 75ohm BNC connectors became mandatory. Now we are pushing 12gbs around in some cases for UHD/4K.

The reason BNC connectors were only 50ohm for mnay years is that the RF industry is typically 50ohms. And as it mattered there and now with broadcast video, the bulk of connectors manufactures were 50ohm.

The only reason true 75ohm connectors are wide spread today is because of digital video systems.

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  • You don't need 75ohm connectors! - gusser 10:41:24 04/03/17 (0)


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