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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exgoofit SMA to BNC Kits Adapter Male Female 2 Set 8pcs RF Coax Coaxial Conne...

exgoofit SMA to BNC Kits Adapter Male Female 2 Set 8pcs RF Coax Coaxial Conne...

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 versatile connectors

🛡️Gold & nickel plating for durability

Description

🔌 Stay connected, stay ahead — the ultimate SMA to BNC adapter kit for pros who demand flawless signal.

MULTI CONNECTOR KIT - 8-piece set covers all SMA to BNC male/female combinations—never get stuck without the right adapter again.
PREMIUM BUILD QUALITY - Brass copper body with nickel plating and gold-plated contacts ensures corrosion resistance and long-lasting performance.
UNIVERSAL COMPATIBILITY - Fits top handheld radios like Baofeng, Wouxun, Kenwood, Yaesu, and SDR dongles for ultimate flexibility.
SEAMLESS RF CONNECTIVITY - Connect your BNC antennas effortlessly to SMA radios with ultra-low signal loss.
HIGH FREQUENCY PERFORMANCE - Supports frequencies up to 3 GHz, perfect for advanced RF applications, wireless LAN, and ham radio enthusiasts.

The exgoofit SMA to BNC Adapter Kit includes 8 high-quality brass connectors with gold and nickel plating, supporting up to 3 GHz frequency and 50 Ohm impedance. Designed for seamless RF connections, it’s compatible with popular handheld radios, SDR dongles, and wireless devices, delivering low-loss, corrosion-resistant performance for professional-grade signal integrity.

Specifications

ASIN	B078K5563Y
Best Sellers Rank	#4,596 in Audio & Video Connectors & Adapters
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 4.6 out of 5 stars (480)
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
Number of Items	8
Number of Pins	8
Other Special Features of the Product	Gold Plated, Low Loss
Part Number	43223-1511
UPC	795042075238

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