Re: [time-nuts] BNC Question

On 4/16/2011 2:59 PM, shali...@gmail.com wrote: As pointed out earlier (by Bruce and others), there is a vast quantity of 75 ohm BNC connectors which mate perfectly with 50 ohm BNC sockets (save for impedance mismatch). I have a set of 10 cables bought off the *bay with such connectors.

Re: [time-nuts] BNC Question

HP made a point of telling users that the 75 ohm female BNC connectors used on HP equipment were fully and safely mate-able with standard male 50 ohm parts. This has been so certainly from the 1970's. Casual inspection of the part shows that it uses the identical center pin set as the 50 ohm

[time-nuts] BNC Question

An Amphenol document discussing the mating compatibility of their 50-ohm and 75-ohm BNC connectors can be found here _http://www.amphenolrf.com/products/bnc.asp?N=0sid=46B11E806D75617F_ (http://www.amphenolrf.com/products/bnc.asp?N=0sid=46B11E806D75617F) . Bruce, KG6OJI

Re: [time-nuts] BNC Question

Oz-in-DFW wrote: BNCs can be as good as TNCs when properly applied, but the bayonet mechanism allows too much mechanical alignment play for reasonable reliability past a GHz or so. If they are properly installed and the cable is not allowed to put a radial or significant tensile load they

Re: [time-nuts] BNC Question

Rick Karlquist wrote: FWIW: The guts of a BNC/TNC is very similar if not identical to a type N, which is good for at least 12.4 GHz. The Agilent 13 GHz scopes have precision (IE tight fitting) BNC connectors on the probes. All of which of course doesn't mean the Asian BNC's you bought at the

Re: [time-nuts] BNC question

On 04/10/2011 01:51 AM, Mike S wrote: At 06:53 PM 4/9/2011, Joseph Gray wrote... I have an old Arcnet hub that I want to salvage the isolated BNC connectors from. Arcnet used 93 Ohm coax. I know that there are 50 Ohm and 75 Ohm versions of BNC connectors, but the ones from the hub look like a

Re: [time-nuts] BNC question

Magnus Danielson wrote: On 04/10/2011 01:51 AM, Mike S wrote: At 06:53 PM 4/9/2011, Joseph Gray wrote... I have an old Arcnet hub that I want to salvage the isolated BNC connectors from. Arcnet used 93 Ohm coax. I know that there are 50 Ohm and 75 Ohm versions of BNC connectors, but the ones

Re: [time-nuts] BNC question

On 04/10/2011 01:44 PM, Bruce Griffiths wrote: Magnus Danielson wrote: On 04/10/2011 01:51 AM, Mike S wrote: At 06:53 PM 4/9/2011, Joseph Gray wrote... I have an old Arcnet hub that I want to salvage the isolated BNC connectors from. Arcnet used 93 Ohm coax. I know that there are 50 Ohm and

Re: [time-nuts] BNC question

From what I recall from our candle lit lab, the 75 ohm BNCs had a slightly larger pin and would open up the 50 ohm females just a skoosh so when you put a 50 ohm, into a 50 ohm that had been tweaked by a 75 ohm, they were noisy or intermittent. Greg On 4/10/2011 5:30 AM, Magnus Danielson wrote:

Re: [time-nuts] BNC question

Types BNC connectors exist in 50 and 75ohm http://en.wikipedia.org/wiki/Ohmversions, matched for use with cables of the samecharacteristic impedance http://en.wikipedia.org/wiki/Characteristic_impedance. The 75 ohm types can sometimes be recognized by the reduced or absentdielectric

Re: [time-nuts] BNC question

I had remembered that it was a 75 ohm that would damage a 50 ohm socket. This article states that a 50 ohm would damage a 75 ohm socket. Greg Indeed, the 75-ohm will have the smaller inner, and hence may be damaged by the larger pin on the 50-ohm connector. David GM8ARV -- SatSignal

Re: [time-nuts] BNC question

Greg Broburg wrote: receivers used 75 ohmantenna http://en.wikipedia.org/wiki/Antenna_%28radio%29inputs, so they often used 75 ohm BNC connectors. I had remembered that it was a 75 ohm that would damage a 50 ohm socket. This article states that a 50 ohm would damage a 75 ohm socket. Greg

Re: [time-nuts] BNC question

Chuck Harris wrote: Greg Broburg wrote: receivers used 75 ohmantenna http://en.wikipedia.org/wiki/Antenna_%28radio%29inputs, so they often used 75 ohm BNC connectors. I had remembered that it was a 75 ohm that would damage a 50 ohm socket. This article states that a 50 ohm would damage a 75

Re: [time-nuts] BNC question

Thanks for all the input. I looked closely at the connectors and they seem to match some 50 Ohm connectors that I have. I have removed them from the board and now have eight isolated BNC connectors for my project. Joe Gray W5JG ___ time-nuts mailing

[time-nuts] BNC question

I have an old Arcnet hub that I want to salvage the isolated BNC connectors from. Arcnet used 93 Ohm coax. I know that there are 50 Ohm and 75 Ohm versions of BNC connectors, but the ones from the hub look like a 50 Ohm BNC to me. I want to use these isolated BNC connectors for a frequency

Re: [time-nuts] BNC question

. Alan G3NYK - Original Message - From: Stan, W1LE stanw...@verizon.net To: Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Sunday, April 10, 2011 12:32 AM Subject: Re: [time-nuts] BNC question Hello Joe, It probably is a 50 ohm BNC female connector

Re: [time-nuts] BNC question

At 06:53 PM 4/9/2011, Joseph Gray wrote... I have an old Arcnet hub that I want to salvage the isolated BNC connectors from. Arcnet used 93 Ohm coax. I know that there are 50 Ohm and 75 Ohm versions of BNC connectors, but the ones from the hub look like a 50 Ohm BNC to me. The ARCNET spec

[time-nuts] BNC Question

Interestingly, 50 and 75-ohm BNC connectors have the same pin/shell dimensions and properly couple together. For more information go to _http://www.cliftonlaboratories.com/august_2007.htm_ (http://www.cliftonlaboratories.com/august_2007.htm) and scroll down to the 02 August 2007 entry.

Re: [time-nuts] BNC Question

Sorri, I must have been thinking type N connectors. Stan, W1LE On 4/9/2011 8:18 PM, brucekar...@aol.com wrote: Interestingly, 50 and 75-ohm BNC connectors have the same pin/shell dimensions and properly couple together. For more information go to