Author Topic: Identify S something mini microwave connectors  (Read 1461 times)

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Offline wd5jfrTopic starter

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Identify S something mini microwave connectors
« on: March 10, 2023, 09:17:44 pm »
I've have several of these female jumper cables that  I would like to use to set up a test board but I can't find what they're called and where to buy at a reasonable price male plugs with circuit board mounts and if there is such an item solderable cable ends.  The upper middle one doesn't have an outer shield and I have only one of those.  Thanks in advance
Thanks
Hank

1735382-1
 

Offline TimFox

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Re: Identify S something mini microwave connectors
« Reply #1 on: March 10, 2023, 09:27:04 pm »
That looks like series "SMB".
These are often found connecting modules within RF test equipment.
The right-angle connectors in the photo are actually easier to wire than are the straight cable connectors.
The unshrouded one looks like someone excised the outer shroud from a normal SMB connector.
« Last Edit: March 10, 2023, 09:28:59 pm by TimFox »
 

Offline wd5jfrTopic starter

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Re: Identify S something mini microwave connectors
« Reply #2 on: March 11, 2023, 12:27:17 am »
Hey Tim
I took out my mag glass and it looks like the outer shield on the middle SMB connector was removed or fell off.  I could see knurled ridge which was for a press fit of the outer collar.  This yellow coax is braided silver double shield  and the center conductor is a solid wire about 0.012" in diameter and outer diameter is about 0.102" using my drill gauge.  I hope this cable and SMBs aren't  75 ohm.  I tried to  get L and C readings on a 30" piece but it's difficult to get a good connection without a male connector.  Will have to sort thru my junk boxes or luck out at next hamfest.  I've included a pic of a piece stripped back anti may be beyond my 82 year old  to make  good connections, but I'll try.  Can anyone ID the coax?
Hank1735478-0
« Last Edit: March 11, 2023, 12:29:39 am by wd5jfr »
 

Offline coromonadalix

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Offline wd5jfrTopic starter

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Re: Identify S something mini microwave connectors
« Reply #4 on: March 12, 2023, 12:26:04 am »
Thanks for Rosenbeger URL.  Good info but I'll have wait to find some on the used market.
Hank
 

Offline coromonadalix

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Re: Identify S something mini microwave connectors
« Reply #5 on: March 12, 2023, 05:02:00 am »

i would use SMA instead  less complicated to use and build, you have tons of possibility / adapters / cables types  etc ...
 

Offline TimFox

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Re: Identify S something mini microwave connectors
« Reply #6 on: March 12, 2023, 02:44:51 pm »

i would use SMA instead  less complicated to use and build, you have tons of possibility / adapters / cables types  etc ...

As I said above, the right-angle SMBs are easier to assemble than the straight SMB plugs.
We used a cheaper series for systems at < 100 MHz from E F Johnson (now Cinch) that were mechanically compatible but not guaranteed to GHz frequencies.
They also made a similar frequency-derated series of SMA-compatible connectors.
Note that the 75-ohm SMBs are a bit larger and will not mate with the 50-ohm connectors.
Obviously, some applications prefer the SMBs to SMAs since the SMB is smaller and snaps in place.
 

Offline wd5jfrTopic starter

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Re: Identify S something mini microwave connectors
« Reply #7 on: March 12, 2023, 05:29:18 pm »
Speaking of the devil and after a bit of soul searching based on the recommendations here and what I have since found I think I will have to be flexible since I located some Rosenbergers SMA jumpers (not very flexible) but less work.  But I will keep looking unenthusiastically for SMB for the flexibility of the yellow mini-coax..  The Rosenberger RTK 57E isn't very flexible!  Can anyone recommend any low cost domestic or Chinese SMBs that are good enough for occasional use?  BTW, I found my wire gauge and the center conductor in the yellow coax is No. 29 wire.
Thanks
Hank 
« Last Edit: March 12, 2023, 05:30:59 pm by wd5jfr »
 


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