Extron 7SC + OSSC

[jjh76]

I just bought some RGB cables from Retro Access for my Genesis model 1 and my PS1/PS2 to use with my Extron 7SC:

Genesis 1 BNC and audio cable – Pro Coaxial Multicore for PVM monitor and Extron
https://retro-access.com/collections/playstation/products/playstation-1-and-2-csync-bnc-and-rca-cable-pro-coaxial-multicore-for-pvm-monitor-and-extron

It wasn’t until after hooking them up that I remembered that the 7Sc doesn’t do any processing on RGB signals and just passes them through to the output. I do have one vga lcd monitor that will display an image but it doesn’t properly decode the signal and everything is washed out with too much green. With the Genesis the image is also shifted to the left with a black bar down the right side of the screen.

I’ve read something about the OSSC’s scart and VGA inputs handling RGB signals differently. With this setup, If I were to connect the output from the 7SC’s VGA connector to an OSSC, can I just use a straight VGA cable, or would it be better to use a VGA to Scart?

I’ve also got some other systems connected to the 7SC through composite and S-video. For these systems, should I set the 7SC to output RGBHV, RGsB, or RGBs?

[BuckoA51]

I thought the 7SC was a scaler, what purpose does it serve in your setup?

[jjh76]

It works as both a scaler and a switcher. It has 7 inputs witch can accept composite, s-video, component, VGA, and RGB. It can output RGBHV, RGsB, or RGBs through either a vga cable or through 5 BNC connectors. The scaler part works on composite, s-video, and component. Which it does with very little lag an looks real nice through the vga input on my 4k tv.

However, VGA and RGB just get passed through to the output with no changes. My 4k tv only accepts RGBVH through the vga input so with the Retro Access rgb cables going through the 7SC I only get a “not accept” message on the tv. And although my lcd monitor does accept the signal it doesn’t display it properly.

[BuckoA51]

If the 7SC is outputting a 31khz signal it should be fine to attach it to AV3.

[nmalinoski]

I’ve read something about the OSSC’s scart and VGA inputs handling RGB signals differently. With this setup, If I were to connect the output from the 7SC’s VGA connector to an OSSC, can I just use a straight VGA cable, or would it be better to use a VGA to Scart?

If it’s just passing through the RGB, it may not be running the signals through a low-pass filter, which is recommended for old game consoles.

In regards to the OSSC, AV3 (DE-15/VGA) expects TTL-level sync and high-quality RGB, and it lacks the type of low-pass filtering on AV1 (SCART), so the OSSC manual instead recommends using AV1 (SCART) for old game consoles.

[CrossBow]

I have this exact same setup myself now. I leave the 7SC in RGBHV and use a BNC to VGA 15pin breakout cable on the output. I found it to provide a slightly sharper picture than using the VGA 15pin out itself.

Anyway, I have it attached on AV3 and have the OSSC set to passthru for pretty much everything. I also locked the 7sc at 640×480 on its output and the OSSC and my TV do not have any issues with this setup. I only have the DC connected via VGA on the 7sc currently, but I’ve also tested with my Lynx and Game Gear via VGA and they were fine.

[jjh76]

Meh, the question now is – do I really want to spend another $220 on my setup?

[CrossBow]

I didn’t pay that for my OSSC setup as I got it second hand. But I can tell you that it will work with both standard VGA from the DB15 out or with breakout cables. Again I have a set of breakout cables that I use for both the DC input and for the VGA out as I felt (Likely a placebo effect), that the image was just a touch better with the breakout BNC cables.

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