Getting HD-SDI monitors working with the Alexa camera for video assist

Gear

ZephyrCan I fly my Alexa or RED on a Zephyr?389

Master SeriesIs a used Master Series rig worth buying as a first big rig?191

BFDHow do I power my BFD receiver from my camera or sled?186

VoltCan I retrofit a Volt onto my existing sled or gimbal?168

ArtemisHow do I power my camera and accessories from an Artemis sled?166

MDRWhere can I mount my Preston MDR on my rig?143

ModulusIs there a Modulus option for HD wireless video?141

G-70Will my G-70 fit my vest, gimbal or sled?126

FI+ZCan I control iris and zoom wirelessly, not just focus?60

HU3Where can I get my HU3 repaired, refurbished or repainted?60

CineLiveHow do I pack and case my CineLive rig for transport?54

G-70XHow does the G-70X compare to Pro Titan, Xarm and other arms?46

Trinity 2Is Trinity 2 SUP 3.0 firmware safe to install or buggy?46

Ultra VestWhich vest should I choose for my body size, comfort and operator type?39

2010General Discussion forum

16 years old. Gear and prices may have changed since.

The Alexa produces HD-SDI output only, with no built-in SD output.
Changing the Alexa monitor output to Progressive scan instead of Progressive Segmented Frame setting may be necessary to make converters work properly.
Setting the AJA converter to 29.97 frame rate can eliminate flickering issues with Alexa output, while other frame rates may cause image dropout patterns.
The Decimator downconverter serves as an alternative to the AJA for converting Alexa HD-SDI to SD for external monitors.
The Alexa prefers 24V power rather than dual 12V power sources when available.
Reversed polarity cables can permanently damage a Decimator by blowing a soldered fuse that requires technician replacement rather than simple resetting.

Solutions were developed for on-set video assist work and may not apply to other use cases.
The TB-6 monitor's image requires more frequent brightness and contrast adjustments when used with Alexa output compared to analog systems.
One user reported reversed cable damage to their Decimator, suggesting power connection care is needed.
The discussion references early Alexa firmware which may have had limited features compared to later versions.
Frame line brightness may be reduced compared to analog setups.