[time-nuts] connectors Re: FW: Re: Low-Cost 6+ GHz Prescaler board for

K. Szeker szeker.k at gmail.com
Fri Mar 26 15:31:59 UTC 2010


Hi Broke,

I think it stays not to discussion, that a better BNC can be usable up to
some GHz, but the longtime life cycle is (& through often using impedance
changings/unsure contacts) _I think_ clear worser as TNC/N...

Have good time!
(Im over longtime time-nuts reader )
Karesz

2010/3/26 Brooke Clarke <brooke at pacific.net>

> Hi John:
>
> When HP came out with the first VNA (8410) I attended one of the demos.
>  Part of that was testing a BNC cable over the microwave range.  It worked
> much better than I expected.  It turns out that the cores of a type-N, TNC
> and BNC connector are all the same and they will properly interface with
> each other (after some modification to allow it).  The problem with panel
> mount BNC connectors is the back side where the impedance is not controlled.
>  If you use a panel mount BNC-BNC connector it's impedance is quite good.
>
> Trompeter used to make a series of connectors (N, TNC, BNC) that all had
> the same panel side outline.  I used them in a family of Wilkinson power
> dividers.
>
> Have Fun,
>
> Brooke Clarke
> http://www.PRC68.com
>
>
>
> jimlux wrote:
>
>> 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.)
>>> http://www.amphenolrf.com/products/bnc.asp?N=0&sid=4BAAA780568BE17F&
>>>
>>> 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
>>> hole...
>>>
>>> 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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