Connectors

[caseymessick]

We are currently designing a connector for a VGA Right Angle Cable (Antenna Isolator)

The problem we are running into is when we test with a right angle connection. When testing straight on, we have no problems, but as soon as the right angle joint is introduced, we get some insertion loss.

Trying to understand why. We are using a 100pF capacitor on a PCB that gave us the best results during trials with straight connections, but with the right angle, we get quite a bit of pixellation on our images.

Picture is attached

 

[VEBill]

The right angle connector might be introducing an 'impedance bump' into the RF line, causing reflections and thus affecting the quality of the signal.

One would normally use a network analyzer to sweep the circuit or the suspicious right angle connector to see how bad its impedance characteristics really are.

It's not uncommon to see frustrated engineers or technicians remove bad adapters from the RF circuit and toss them into a very deep garbage can.

Clarifications: is your VGA a variable gain amplifier, not a video standard? Is it in a video transmission circuit, thus your mention of pixelization? Your post was a bit confusing since a VGA connector has a more common meaning related to analog video for PCs.

 

[IRstuff]

I think the "antenna isolator" stipulation clarifies the terminology.

Are you using a similar straight male/female connector, or are you connecting a connectorized cable? In the right-angle case, you have something like 4 additional insertion losses before getting into a cable, compared to a straight connector that directly terminates a cable.

TTFN
faq731-376

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[zappedagain]

Is that a right angle adapter or a right angle connector in the photo? If the latter, I suspect a bad crimp/joint on the connector.

Z

 

[caseymessick]

"I think the "antenna isolator" stipulation clarifies the terminology.

Are you using a similar straight male/female connector, or are you connecting a connectorized cable? In the right-angle case, you have something like 4 additional insertion losses before getting into a cable, compared to a straight connector that directly terminates a cable."

What would the 4 additional insertion losses be? How would we be able to reduce or eliminate them?