Re: [time-nuts] Special connector for Symmetricom X72 rubidium standard

I did some more work on the HP printer cable that uses this connector. Here's what I found: 1. Pin 25 on the X72 connector is unconnected. 2. The connector is IDC. It's possible to open it up and add the extra lead, but like all IDC connectors, it's rather fragile. 3. Of the 25 leads in

Re: [time-nuts] Special connector for Symmetricom X72 rubidium standard

Hi 10 MHz sine output would be pretty high up on my list of “pins to send someplace else …” Bob > On Aug 17, 2017, at 5:36 PM, Mark Sims wrote: > > Cable has a DB-25 on the other end. X72 uses 26 pins. So logically it would > be pin 26 that is missing... 10 MHz sine

[time-nuts] Special connector for Symmetricom X72 rubidium standard

Cable has a DB-25 on the other end. X72 uses 26 pins. So logically it would be pin 26 that is missing... 10 MHz sine wave output... nobody needs that one now, do they? > If you have it open, can you tell which is the pin that's missing? Maybe that one isn't needed and

[time-nuts] Why 80MHz?

I have noticed, of late, several used 80MHz OCXOs for sale. Is there a particular industry that uses 80MHz as a typical reference freq? I'm sure there's a reason why it is 80 vs. 100 or 10 or 5.. I just don't know what it is. -Brian ___

Re: [time-nuts] Special connector for Symmetricom X72 rubidium standard

On Thu, 17 Aug 2017 13:05:47 -0600 Ed Palmer wrote: > One source of that connector is an HP C8231A cable for a Deskjet 450. > It's used to connect the printer to a DB-25 parallel port. The connector > fits the X72, but there are only 25 leads in the cable. I haven't

[time-nuts] Special connector for Symmetricom X72 rubidium standard

I'm leaning more towards a two board solution now. A small 0.032" board that breaks out the X72 connector to a standard 26 pin ribbon cable header and a larger 0.062" board with the BNC's and RS-232 interface. This should provide a more robust solution that offers better mounting options.

Re: [time-nuts] Special connector for Symmetricom X72 rubidium standard

Chris, One source of that connector is an HP C8231A cable for a Deskjet 450. It's used to connect the printer to a DB-25 parallel port. The connector fits the X72, but there are only 25 leads in the cable. I haven't tried to use it so I don't know if the missing lead is important or not.

Re: [time-nuts] Special connector for Symmetricom X72 rubidium standard

I'm interested in a piece or two if you do this. Happy to review schematics and layout, too. -- Christopher AI6KG On Tue, Aug 15, 2017 at 8:28 AM, Mark Sims wrote: > Symmetricom sold some interface boards for the X72. They are 0.32-ish > inch thick PCB's with a dual

Re: [time-nuts] Trimble Thunderbolt no longer determines the correct date

On 08/11/2017 06:26 PM, Tom Van Baak wrote: The E911 installation, in the news, is just one of several. Others are hospitals, fire stations, etc. using different dispatch systems. Hey, at least important things like mobile phones, ISP's, Google, Amazon, FedEx and Starbucks aren't affected