Home
AudioAsylum Trader
Digital Drive

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

For Sale Ads

FAQ / News / Events

 

Use this form to submit comments directly to the Asylum moderators for this forum. We're particularly interested in truly outstanding posts that might be added to our FAQs.

You may also use this form to provide feedback or to call attention to messages that may be in violation of our content rules.

You must login to use this feature.

Inmate Login


Login to access features only available to registered Asylum Inmates.
    By default, logging in will set a session cookie that disappears when you close your browser. Clicking on the 'Remember my Moniker & Password' below will cause a permanent 'Login Cookie' to be set.

Moniker/Username:

The Name that you picked or by default, your email.
Forgot Moniker?

 
 

Examples "Rapper", "Bob W", "joe@aol.com".

Password:    

Forgot Password?

 Remember my Moniker & Password ( What's this?)

If you don't have an Asylum Account, you can create one by clicking Here.

Our privacy policy can be reviewed by clicking Here.

Inmate Comments

From:  
Your Email:  
Subject:  

Message Comments

   

Original Message

You don't need 75ohm connectors!

Posted by gusser on April 3, 2017 at 10:41:24:

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.