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Old 26th Apr 2019, 1:26 am   #1
Redders03
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Default Marconi TF2370 110MHz Spectrum Analyser Interconnection Cables

I've recently purchased a Marconi TF2370 and discovered it's missing the interconnection cables between the display unit and attenuator box.

Does anyone have a set spare, or know where to source ?

Thanks
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Old 26th Apr 2019, 12:39 pm   #2
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Default Re: Marconi TF2370 110MHz Spectrum Analyser Interconnection Cables

Can you post a photo of the connectors please.

From memory they are the Centronics type, 50 way? but quite short and 90 degrees.
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Old 26th Apr 2019, 12:50 pm   #3
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Default Re: Marconi TF2370 110MHz Spectrum Analyser Interconnection Cables

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Originally Posted by woodchips View Post
Can you post a photo of the connectors please.

From memory they are the Centronics type, 50 way? but quite short and 90 degrees.
Hi Woodchips,

Yes, they are Centronics 50 Way. I've provided images from my unit and the diagram from the manual.
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Old 26th Apr 2019, 12:58 pm   #4
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Default Re: Marconi TF2370 110MHz Spectrum Analyser Interconnection Cables

"Amphenols". THe male connector is wedge-shaped. Quite a lot of firms used them, not just Centronics, and Amphenol made plenty of other connectors. A search fro Amphenol, 50 way might find some.

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Old 26th Apr 2019, 1:24 pm   #5
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Default Re: Marconi TF2370 110MHz Spectrum Analyser Interconnection Cables

Quote:
Originally Posted by Radio Wrangler View Post
"Amphenols". THe male connector is wedge-shaped. Quite a lot of firms used them, not just Centronics, and Amphenol made plenty of other connectors. A search fro Amphenol, 50 way might find some.

David
David, just discovered the Amphenol / Centronics (50 Way) was previously used as a connector for SCSI 1 :

https://www.cablestogo.com/learning/...#centronics-50

Therefor its not impossible to find such cables when searching for SCSI 50 Way:

https://www.ebay.co.uk/itm/SCSI-cabl...wAAOSw~KpceY8R

I'm hoping this to be suitable ?
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Old 26th Apr 2019, 1:46 pm   #6
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Default Re: Marconi TF2370 110MHz Spectrum Analyser Interconnection Cables

I've never used SCSI, but if that's a 50 way amphenol, then you ought to be able to get the core of the connectors quite easily.

The next problem is finding out how they're wired. If frequency references, signals, etc make the trip there may be some shielded coaxes and twisted pairs involved.

I don't know my way round these analysers specifically... I designed such things for the other brand...

David
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Old 27th Apr 2019, 7:13 am   #7
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Default Re: Marconi TF2370 110MHz Spectrum Analyser Interconnection Cables

Bummer, that's really unfortunate, here's a pic of the connectors. I had one of these SA's Alex and am pretty sure each lead is wired different, an A and a B lead if you will.

Andy.
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Old 28th Apr 2019, 4:37 pm   #8
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Default Re: Marconi TF2370 110MHz Spectrum Analyser Interconnection Cables

Thanks to everybody who added to this thread

Guess i'll have to make the cables up, rather than source originals.

Once I get round to finding a solution, i'll post about it in the Test Equipment forum.

Mods, feel free to close this at your discretion.
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Old 28th Apr 2019, 9:54 pm   #9
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Default Re: Marconi TF2370 110MHz Spectrum Analyser Interconnection Cables

I think I may have a service manual for a 2370 hidden away in the loft - can't count on it, but would it be of any use ?
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Old 28th Apr 2019, 10:19 pm   #10
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Default Re: Marconi TF2370 110MHz Spectrum Analyser Interconnection Cables

You can download the manual from Bama. I have one which I managed to get sort of running. I also bought a low loss probe for it which I have yet to try.

The main problems are the PCB's you need an extension board for and lots of unreliable 'Griplets' that need soldering.

Mine still has a slightly high noise floor and the switches need to be cleaned.
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Old 28th Apr 2019, 11:33 pm   #11
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Default Re: Marconi TF2370 110MHz Spectrum Analyser Interconnection Cables

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Originally Posted by g4wim_tim View Post
I think I may have a service manual for a 2370 hidden away in the loft - can't count on it, but would it be of any use ?
If you do have an original copy, I'd love to add it to the collection. I'm in no rush for it either as I won't be looking at this till next month.

Quote:
Originally Posted by PJL View Post
You can download the manual from Bama. I have one which I managed to get sort of running. I also bought a low loss probe for it which I have yet to try.

The main problems are the PCB's you need an extension board for and lots of unreliable 'Griplets' that need soldering.

Mine still has a slightly high noise floor and the switches need to be cleaned.
Yes i've read about the 'Griplets', I don't mind spending summer on it while I have some spare time.

Also, a seller on eBay makes custom extender cards, I'll give them a try if needed.
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Old 7th May 2019, 5:10 pm   #12
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Default Re: Marconi TF2370 110MHz Spectrum Analyser Interconnection Cables

For anyone in the future looking for such cables. I found an appropriate set of SCSI 1 Cables by IBM.

Sourced here :

https://rover.ebay.com/rover/0/0/0?m...2F391907391941

These crucially include 50 Cores with 1-1 mapping for each pin.

0.6M in length, so particularly useful while troubleshooting.

I can’t comment on side affects of not including coax, like the originals at this stage. My own unit requires attention. However on the Marconi Yahoo Group members have vouched using 0.6m cables should not pose an issue.
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Old 8th May 2019, 11:52 am   #13
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Default Re: Marconi TF2370 110MHz Spectrum Analyser Interconnection Cables

I’ve been informed by the Marconi Group the following also work as a substitute:
Farnell 152-5882

https://uk.farnell.com/videk/1501/le...ngdom%2Fsearch


Mods feel free to close this thread.

Quote:
Originally Posted by Redders03 View Post
For anyone in the future looking for such cables. I found an appropriate set of SCSI 1 Cables by IBM.

Sourced here :

https://rover.ebay.com/rover/0/0/0?m...2F391907391941

These crucially include 50 Cores with 1-1 mapping for each pin.

0.6M in length, so particularly useful while troubleshooting.

I can’t comment on side affects of not including coax, like the originals at this stage. My own unit requires attention. However on the Marconi Yahoo Group members have vouched using 0.6m cables should not pose an issue.
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Old 8th May 2019, 1:05 pm   #14
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Default Re: Marconi TF2370 110MHz Spectrum Analyser Interconnection Cables

Quote:
Originally Posted by PJL View Post
The main problems are the PCB's you need an extension board for and lots of unreliable 'Griplets' that need soldering.
I got around the extender card problem by temporarily soldering a short extension wire onto points that I needed to monitor.

Peter.
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Old 19th May 2019, 7:05 pm   #15
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Default Re: Marconi TF2370 110MHz Spectrum Analyser Interconnection Cables

if you are still interested, I picked up one of these cables today at the Luton Radio Rally - Yours if you want it
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