Posted on sam. 19 mars 2016

This is a quick follow-up of the first part of this series.

I've received a few parts from digikey, including a couple of 22┬ÁH Sumida CLS62 inductors (I bought two of them in case I f**k up one of them trying to solder it with my Weller WS50 iron).

Desoldering and soldering SMD parts without an air flow station is a bit tricky, but eventually I succeded in replacing the broken inductor.

The Extron Video Distribution Amplifier fixed with a new inductor for its small DC-DC converter.

Now the "video" amplifier works like a charm. The 10MHz signal is nicely amplified:

The Extron Video Distribution Amplifier dispatching a 10MHz signal to several equipments.

At 10Mhz, the amplifier dephase the signal of about 20ns (ie. 72 deg). We can also note that (the input impedance of the Extron amplifier is set to 75 ohm, while my scope is at 1 Mohm; I should try using the input of my scope set at 50ohm) that the amplification factor is exactly x2.

The Extron Video Distribution Amplifier dephasing at 10MHz.

What I need to check carefully now is if all the outputs of the amplifier are perfectly in phase.

It's amusing that a few days ago, FlyingHacker did post a new thread on the EEVBlog forum in which he explain that he uses exactly the same distribution amplifier to provide a 10MHz reference to several test equipments. Exactly what I have in mind with mine!

One thing I will probably not do is adapting the input/output impedance (from 75 ohm to 50 ohm). I'm pretty sure it will work fine as is. We'll see if it provoque some side effects (especioally on the phase of the signal).