[Milsurplus] question - on BNC RF connectors

[W2HX]

The other way will not work. Plus, because the female socket is a larger diameter than the 50 ohm male, you will not have a good connection. Expect diminished working frequency range.

 
73 Eugene W2HX
 


-----Original Message-----
From: milsurplus-bounces at mailman.qth.net [mailto:milsurplus-bounces at mailman.qth.net] On Behalf Of John Hutchins
Sent: Saturday, August 31, 2013 6:17 PM
To: Mike Feher
Cc: 'Milsurplus at mailman.qth.net'
Subject: Re: [Milsurplus] question - on BNC RF connectors

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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