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

On Mon, 21 Aug 2017 14:56:20 + Mark Sims wrote: > RDR Electronics has SA22's for not much more than the X72. > The problem with SA22's is the connector. It is a dual row 18 pin > connector with 2mm pitch. At least you can get 2mm header pins quite easily. But yes, I

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

use it! Ed On 2017-08-21 12:49 PM, time-nuts-requ...@febo.com wrote: Message: 2 Date: Mon, 21 Aug 2017 14:56:20 + From: Mark Sims<hol...@hotmail.com> To:"time-nuts@febo.com" <time-nuts@febo.com> Subject: [time-nuts] Special connector for Symmetricom X72 rubidium

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

Hi A lot of the OEM’s seem to be going with a large multi layer PCB as the “heatsink” for the lightweight Rb’s. Apparently they have enough airflow through their racks that this works ok for them. In that case, I think I’d prefer some sort of “cheap” SMD PC mount connector. Faster to

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

I'm going to buy enough boards to get them for a decent price... way lower than you can have them built for. Will also probably do them with a kit of parts. RDR Electronics has SA22's for not much more than the X72. The problem with SA22's is the connector. It is a dual row 18 pin connector

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

Hello Ed, No I do not want to use a printer cable to connect to the X72 oscillator. This is not recommendable as you wrote for several reasons. I would prefer a solution which uses an actual connector which could replace the obsolete Molex 52660-2651 plug. This is very difficult because every

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

Yes, you're missing something... the SA22.c runs on +15V and +5V. The X72 manual says they have 5V versions and versions that can run on 10V .. 30V (but the HEALTH message reports some values that appear to indicate it alarms or shuts down at <11.47V or >23.9969). But who knows? The X72 /

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

On Sun, 20 Aug 2017 16:22:18 + Mark Sims wrote: > It can also be used with the SA22.c once a board that breaks out the SA22 > connector pinouts to a 34 pin cable (8 pins are for the SA22.c +5V power/ > gnd) is built. Note the TO-220 LM7805 voltage regulator...

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

Here's a look at the first cut of the signal interface board for the X72. The board does not bring out the LEDs. You can pick those off the connector board. It can also be used with the SA22.c once a board that breaks out the SA22 connector pinouts to a 34 pin cable (8 pins are for the SA22.c

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

The Mark II (groan)... changed power connector to a 2.1mm barrel jack, added a 15uF or so filter cap, added a PPS LED, added a separate ground test point, added series damping resistors for the ACMOS and FXO outputs (can be omitted to isolate these signals from the cable),

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

Chris, Are you suggesting reusing the entire cable? I wasn't suggesting that. The cable is over a meter long! Even if the wiring was correct, which it isn't, I don't know if you could pull enough power through those 28 guage wires even though they have multiple leads in parallel. Either

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

Image of the first cut of the X72 interface board attached... This board can be used stand-alone or connected to another soon-to-be board with RS-232, 4xBNC, and 2.1mm power connectors. Hopefully the second board will also be able to connect to a

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

Hello all, here is the connection schematics from symmetricoms designer manual for the X72. So you see, that there is no need for an25 pin connector on the boards side :) If someone wants to download the X72 designer guide here it is:

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

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] Special connector for Symmetricom X72 rubidium standard

Hello Attila, I found one manufacturer which has nearly similar connectors in his program: htk-jp.com They have SDR and HDR connectors on stock but all of them do have 0.8 mm pitch. The original Molex 52660-2651 connector has 1.0 mm pitch so that would not fit... Am 16.08.2017 um 13:05

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

Re-moin, On Wed, 16 Aug 2017 14:01:02 +0200 Christoph Kopetzky wrote: > I found one manufacturer which has nearly similar connectors in his > program: htk-jp.com > They have SDR and HDR connectors on stock but all of them do have 0.8 mm > pitch. The > original Molex 52660-2651

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

Moin, On Tue, 15 Aug 2017 15:15:16 +0200 Christoph Kopetzky wrote: > I am looking without any success for some Molex plugs (52660-2651) to > connect to my X72 time standard. > Molex told me that these connectors are obolete since 2010. > I made some recherches at the Molex

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

t;c...@cksd.de> To: time-nuts@febo.com Subject: [time-nuts] Special connector for Symmetricom X72 rubidium standard Message-ID: <016e6b48-a7d7-6624-9a61-7aa8f7785...@cksd.de> Content-Type: text/plain; charset=utf-8; format=flowed Dear all time-nuts list members, I am looking without

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

Symmetricom sold some interface boards for the X72. They are 0.32-ish inch thick PCB's with a dual sided edge tab pattern on them. The PCB edge tab will insert into the connector on the X72. The interface board for my X72's only breaks out 12 pins... a lot of Ebay X72's come with that 12

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

Dear all time-nuts list members, I am looking without any success for some Molex plugs (52660-2651) to connect to my X72 time standard. Molex told me that these connectors are obolete since 2010. I made some recherches at the Molex competitors but all told me that they do not have 1mm pitch