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Re: BNC Frequency Limit

 

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The frequency counter can't measure amplitude. Using BNC above 4 GHz causes losses due to reflection, but the frequency counter will still work even if your signal is 10dB lower. If you use BNC connectors with a spectrum analyzer, you'll see that the amplitude of your signal is now lower since you used BNC instead of SMA or N.

If you get a VNA, you can also see that the input of the frequency counter is no longer 50 ohms at 22 GHz.

I am also not aware of any frequency counters that go that high that use type BNC connectors. Perhaps it uses an N connector, and you have an adapter?

On 6/29/24 10:58 AM, Jinxie via groups.io wrote:

Hi all,

According to this site:

50 ohm BNC connectors are only good up to 4GHz and 75 ohm ones to 2GHz maximum. And yet - to take just one example - my best frequency counter, which accepts and can measure signals up to 22Ghz, uses 50 Ohm BNC sockets and seemingly works just fine with them. And yet it's not just the Historytools website which claims BNC is only good up to a few GHz; plenty of other sources say the same thing. What's going on here?

Thanks,
J.

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