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Author Topic: BNC male connectors: is right angle a problem?  (Read 1531 times)
K7RNO
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Posts: 279




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« on: July 30, 2013, 10:11:29 PM »

I would prefer to connect coax to my KX3 with a right-angle connector to keep the coax out of the fray. Might that 90° angle cause any problems with my RF signal?

(I am using such a connector also for my HT when I have it in shack mode, and I have not noticed any issues, but that doesn't mean there aren't any.)
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73,
aRNO
NAQCC #6870, SKCC #11131
VK2TIL
Member

Posts: 342




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« Reply #1 on: July 30, 2013, 11:36:17 PM »

It will be fine, subject to the same comment I would make for any connector; use good quality.

I think the quality of BNCs began to suffer when they began to be used in Ethernet; I'm inclined to think that the shinier they are, the lower is the quality.  Smiley

The ones the local (VK) electronics chain (Jaycar) stocks are, in my experience, rather poor; the ones my main supplier (MiniKits) stocks are very good and are less-expensive than the Jaycar ones!

It's no big deal, just get them from a reputable supplier.

I use good-quality BNCs on the test bench at up to about 1.5 GHz with no problems; this is a critical application and poor connectors cause errors and a different measurement each time.

Co-incidentally, I'm just doing some shack "plumbing" now; I'm using BNCs on the inside wall for connection of radios.
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K2DC
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« Reply #2 on: July 31, 2013, 02:34:17 AM »

If you can find a swept 90 degree adapter, they are typically better matched than those with a sharp right angle.  But for anything other than precision measurement applications, either should be fine.

73,

Don, K2DC
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N4KD
Member

Posts: 142




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« Reply #3 on: July 31, 2013, 08:01:05 AM »

I don't like adapters, at all. I prefer to find a right angle connector that fits the coax directly. Try AMPHENOL RF - 31-5911-RFX - CONNECTOR, BNC, PLUG, 50 OHM, CABLE. This available at Newark and is for RG-58. Different sources sell for different coax, but you should always be able to find one for $3-$4 a piece.

Vy 73,
Dave N4KD
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AA4PB
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Posts: 12990




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« Reply #4 on: July 31, 2013, 08:20:31 AM »

On HF the adapter is so small in terms of a wavelength that it will have no noticeable affect as long as the connections are tight. A right angle connector would have the advantage of only one connection instead of two - but it still isn't a big deal in my opinion.
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WB4SPT
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Posts: 161




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« Reply #5 on: July 31, 2013, 09:33:17 AM »

Keep it below 10GHz and you will be fine. Grin The bigger issue with BNC's is a small, but measurable noise level as the mated connector is rocked. 
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K7RNO
Member

Posts: 279




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« Reply #6 on: July 31, 2013, 11:18:30 AM »

I will be feeding it with RG-8X, and there is not one right-angle connector available in stock, anywhere. Yes, Amphenol makes one (RF - 31-6005-RFX ), but nobody has it in stock. Waiting time? Who knows, really!

So I will use straight connectors and a right-angle adapter (if I can find one). At least this way I can get going.

Thank you all for your help, it is appreciated!

73,
Arno
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73,
aRNO
NAQCC #6870, SKCC #11131
WX7G
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Posts: 6214




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« Reply #7 on: July 31, 2013, 01:15:27 PM »

Radio Shack TM stocks a right angle BNC and that's where I got one for my KX3. They also stock right angle 3.5 mm adapters for the cables on the left side of the KX3.
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K7RNO
Member

Posts: 279




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« Reply #8 on: July 31, 2013, 01:48:34 PM »

Thanks, I actually have that Radio Shack connector, with a black plastic outside case. After I saw they want the center lead wound around a tiny screw, I decided to use it in the parts bin.

I now have a straight (metal!) connector on the coax and a solid right-angle adapter. I like that solution.

For whoever uses RG-58, RFI makes a very nice silver-plated right-angle connector (RFB-1110-C04)! Just not for RG-8X  Cry

So, I am all set now. Thanks all!

73,
Arno
« Last Edit: July 31, 2013, 01:53:51 PM by K7RNO » Logged

73,
aRNO
NAQCC #6870, SKCC #11131
N4KD
Member

Posts: 142




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« Reply #9 on: July 31, 2013, 02:13:21 PM »

RG-8x is the same size as LMR-240. they're both in cable group X. If you search for LMR-240 compatible connectors, you'll have much more luck. Check RF Parts... http://www.rfparts.com/112601.html

Says in stock.

- Dave

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K7RNO
Member

Posts: 279




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« Reply #10 on: July 31, 2013, 02:43:04 PM »

Shoot! I would have waited for that one. I did not find it when I looked there, and I also looked for cable group X. Correction: I had seen that one, but not found it at RF Parts, only at Mauser, who didn't have stock.
I just called RF Parts, and their minimum order volume is $25, but I don't need anything else for now. Thank you, Dave!

73,
Arno
« Last Edit: July 31, 2013, 03:00:46 PM by K7RNO » Logged

73,
aRNO
NAQCC #6870, SKCC #11131
N4KD
Member

Posts: 142




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« Reply #11 on: July 31, 2013, 04:00:14 PM »

I forgot about the minimum order. Not many companies have that anymore. Even Digikey dropped theirs.

Have fun with the KX3. I have a ball with mine.

- Dave
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