Will these work for 300ohm to 75ohm outdoor antenna to coaxial connection?

300 ohm cable is generally twin-axial balanced line and does not have connectors. Generally a transformer us needed. These connector are 50 ohms, so there will be a mismatch to 75 ohm cable. Not a big deal for receive applications. Most 75 ohm coax cable takes F type connectors. "These are not the connectors you are looking for" IF you need 50 ohm SMA to BNC, adapters, these have worked fine for me.

Will these work for sdi video camera connections?

For SDI you usually RG-59 or RG-6 and SMA is really for much lower performance thinner RF cable so it will work for a short run but probably not optimal

Yes .... you may use these adapters in a 50ohns cable

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BNC to SMA Adapter

Product ID: 58060844

Details

Brand
exgoofit
Cable Type
Coaxial
Compatible Devices
for SDR PC
Connector Type
BNC Coaxial RF
Special Feature
Gold Plated

📶3 GHz max frequency

🔗8-piece versatile adapter set

🛡️Gold & nickel plating for corrosion resistance

A$18

Duties & taxes included

In stock

Sold byAmazon AustraliaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔌 Connect Like a Pro — Never Miss a Signal!

UNIVERSAL COMPATIBILITY - Perfect for HAM radios, SDR dongles, walkie talkies, and wireless LAN devices.
RUGGED BRASS CONSTRUCTION - Durable build designed for both indoor and outdoor professional use.
COMPLETE 8 PIECE ADAPTER KIT - Includes all SMA to BNC male/female combinations to fit every RF setup.
PREMIUM GOLD NICKEL PLATING - Ensures ultra-low signal loss and long-lasting corrosion resistance.
SEAMLESS 3 G HZ RF CONNECTIVITY - Supports high-frequency signals up to 3 GHz for crystal-clear transmission.

The exgoofit SMA to BNC Adapter Kit offers 8 versatile brass connectors with gold and nickel plating, supporting up to 3 GHz frequency. Designed for professional RF applications, it ensures low-loss, corrosion-resistant connections compatible with HAM radios, SDR devices, and wireless LAN setups, making it an essential tool for any serious RF enthusiast or professional.

Specifications

ASIN	B078K5563Y
Best Sellers Rank	#972 in Audio & Video Connectors & Adapters
Brand	exgoofit
Brand Name	exgoofit
Cable Type	Coaxial
Color	silver
Compatible Devices	for SDR,PC,Handheld Radios, Scanner,Walkie Talkie
Compatible Phone Models	No Compatible Phone Models
Connector Gender	Female-to-Female, Male-to-Female
Connector Type	BNC, Coaxial, RF Connector, SMA
Customer Package Type	Standard Packaging
Customer Reviews	4.6 out of 5 stars 478 Reviews
Data Transfer Rate	3 gigabits_per_second
Ethernet Cable Category	Cat 6a
Frequency	3 GHz
Gauge	16
Indoor Outdoor Usage	Indoor, Outdoor
Item Weight	1.76 ounces
Manufacturer	exgoofit
Model	8541741496
Model Name	8541741496
Number of Items	8
Number of Pins	8
Other Special Features of the Product	Gold Plated, Low Loss
Part Number	43223-1511
Recommended Uses For Product	connecting BNC devices to SMA devices, widely used for RF applications, antennas, wireless LAN devices, coaxial cables, Wifi, ham radios, handheld radios, scanner, SDR, base stations aerial, uhf/vhf operator, PC/LAN telecom
Special Feature	Gold Plated, Low Loss
UPC	795042075238

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