Bnc to SO239 adapter Issues on 6600m

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  • Updated 1 year ago
Ok strange problem here. I am using a W6LVP Loop in an RV. Went to hook it up to RX1 on 6600m. No receive. Tried all four BNC connectors and no joy. I use a Pixel on a 6700 at home so I am familiar with the hookup. I then took the BNC to SO 239 adapter off and hooked to Ant 2...SUCCESSES. I then ohmed both of my adapters out from same manufacturer....good. Hmmm then I touched the center pin of PL259 to center pin of BNC on back of radio..SIGNAL. So my thoughts that I have two identical adapters that are not mating up to the radio? The BNC Connectors on the M series look A little different physically. Does anybody know of any good adapters that work with the new M series radios or have any other suggestions? Is there a way to lock out Ant2 so I can’t accidentally transmit?
Thanks
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Lawrence Kellar KB5ZZB

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Posted 1 year ago

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Terry Tankersley

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I use Larry's loop on the XVTR port and it works great.
Terry
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Lawrence Kellar KB5ZZB

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Works great too. Just can’t get signal through the Rx or Xverter ports
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HCampbell WB4IVF

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Lawrence –

What brand adapters are you using?   DC resistance testing doesn’t tell the whole story.  Because of problems I’ve encountered with some cheaper brands in the past, now I only use high quality Amphenol and RFC connectors/adapters like:

https://www.dxengineering.com/search/coaxial-adapter-end-2/uhf-female-so-239/quantity/sold-individually/product-line/amphenol-rf-bnc-male-uhf-female-coaxial-adapters?autoview=SKU&sortby=Default&sortorder=Default

Can be also be found cheaper on Ebay:

https://www.ebay.com/itm/Amphenol-000-2900-UG-255-U-SO-239-UHF-Female-to-BNC-Male-Coax-Adaptor-74868-USA/252085401277?epid=1240402326&hash=item3ab175f6bd:g:JPMAAOSwImRYSZHZ

 BTW, N5IAW sells high quality connectors on Ebay.  His prices and customer service are outsanding:

https://www.ebay.com/sch/n5iaw/m.html?_nkw=&_armrs=1&_ipg=&_from=

Howard

(Edited)
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Lawrence Kellar KB5ZZB

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Official Response
Went back home and found some “old” bnc adapters. The center pin appears to stick out a little further on these. It worked perfectly. Thanks everyone
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Robert Lonn

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Be aware that the center pin of a BNC will vary depending if it 50 Ohms or 75 Ohms. 75 is very thin  where 50 ohms is much thicker... So be sure the BNC to SO239 is specked for 50 ohms.. Lots of 75 Ohms connectors are specked for the CABLE TV, Direct TV, DIsh, MATV Industry where everything is 75 Ohms,,  But it sounds like the center pin was Sucked Out a bit..

Robert