[time-nuts] connectors Re: FW: Re: Low-Cost 6+ GHz Prescaler board for
jimlux at earthlink.net
Fri Mar 26 12:27:58 UTC 2010
John Allen wrote:
> A few notes about the connector.
> First, I hate BNC connectors.
> But the BNC is useable to 11 GHz (No vswr spec.), and has a VSWR spec. of 1.3:1
> up to 4 GHz. (See link below, about half way down the page.)
> The application is not a precision one except for frequency - Power transfer
> inaccuracy due to return loss is not a big deal here, we are not using it in a
> VNA or power meter etc.
> PS: Would anybody be interested in testing an SMA to BNC-F and BNC-M to SMA pair
> on a VNA?
> Further, some BNC adapters (to SMA) are specified. to 8 GHz. With 1.25:1 VSWR
> Also - here is a BNC to SMA bulkhead with 10 GHz VSWR max of 1.4:1
> http://www.fairviewmicrowave.com/adaptersbncsma.htm (Bottom middle).
> Now if only we could find a SMA to SMA bulkhead that fit in a BNC mounting
> John Allen K1AE
I think I've seen hermetic sealed feedthrough for applications like
vacuum chambers that fit in a larger than normal hole. But they're
probably also really, really expensive.
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