[Milsurplus] question - on BNC RF connectors

[John Hutchins]

Group -

With the BNC connector Panel mount Female 75 Ohm will mate with a male 
50 Ohm RG58C/U Pamona cable  just tried this out on my work table.
I am making up a few test fixtures, blocking capacitors, and such 
mounted in little metal boxes needed for the signal generator to meet 
various receiver alignment criteria.
Since we are talking about ~1/2" run length at most for the 75Ohm 
females connector.  I do not think that a 50 Ohm load requirement for 
the signal generator is going to suffer, that much of a miss-match.

Conclusion I have reached is that a 50 Ohm Male will mate with a 75 Ohm 
Female.

Thanks for you assistance.
Hutch



On 8/31/2013 9:22 AM, Mike Feher wrote:
> I am not sure about that. N connectors definitely have different diameter
> male and female sections and are not interchangeable without either damage,
> or, an open circuit. However, from what I recall, BNCs are interchangeable
> as the only difference between the two is the dielectric loading within the
> connector. At low frequencies, the only problem if they do mate would be a
> 1.5 to 1 impedance mismatch jump, not a big deal for most applications.
> Regards - Mike
>
> Mike B. Feher, N4FS
> 89 Arnold Blvd.
> Howell, NJ, 07731
> 732-886-5960
>
>
> -----Original Message-----
> From: milsurplus-bounces at mailman.qth.net
> [mailto:milsurplus-bounces at mailman.qth.net] On Behalf Of J. Forster
> Sent: Saturday, August 31, 2013 10:02 AM
> To: John Hutchins
> Cc: Milsurplus at mailman.qth.net
> Subject: Re: [Milsurplus] question - on BNC RF connectors
>
> The real 50 and 75 Ohm BNCs do NOT intermate w/o damage. The center
> connector pin is different.
>
> You should use what the generator has.
>
> -John
>
> ================
>
>
>> Group -
>> Have generators that are 50ohm  and 75ohm outputs respectively. Making
>> blocking capacitor modules; and RMA ant simulator module to be used
>> between the two different generators.  Do I use 50 Ohm BNC or 75 Ohm
>> BNC connectors? Or does it really matter.
>> Thanks
>> Hutch
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