Due to price and complexity, wireless video transmitters were out of reach for all but high-end professionals. Now, however, with the likes of the Cosmo C1, these devices are affordable for everyone, albeit still at a cost. While affordable, this means certain features such as setting up surveillance compatibility with broadcast control units and other professional gear are not a feature. But if you’re using a broadcast kit, you probably won’t be looking at the Cosmo C1.
Hollyland has essentially created a transmission device designed to be used by today’s emerging video market, small productions that need professional tools.
The wireless system uses the 5.1 to 5.8 GHz bandwidth and uses the proprietary HEVO chip from Hollylands to enable automatic channel switching. This means that if you have multiple people at an event, using similar devices, the Cosmo C1’s HEVO solution will find the channel that is free for the paired transmitter and receiver, and switch to it.
Essentially like the scan function on many wireless microphones, the HEVO solution finds the cleanest channel to ensure the least amount of interference possible.
As the system is based on radio frequency rather than Wi-Fi, unlike cheaper systems, the signal strength is much stronger. This means that you can be at a distance from the transmitter, up to 1000 feet (300 m), and still receive a signal.
This video signal is transmitted in full 1080p at up to 60 fps, which is impressive and more than enough to monitor what is being filmed.
The next big feature is the built-in UVC for direct live streaming. This lets you plug a USB Type-C cable into the receiver and then plug it into your computer so the stream can be used to stream live video content.
When it comes to connecting to the video feed from the camera to the TX, it can be done in two ways; the first is via standard HDMI and the second via SDI. Most DSLRs and mirrorless cameras offer HDMI, and it’s only when you move up to professional camcorders that SDI starts to come into play.
The HDMI option is simple to plug straight into the TX and out of the RX, whereas with SDI on the TX you have SDI in and SDI Loop out.
Another cool feature is that there are multiple power options; the first is the ability to plug the TX or RX into the mains so the devices are powered from the mains, although there is only one adapter in the box.
The following two options are more suitable for use in the field. The first is USB Type-C, where power can be passed directly from a USB power bank to units for power. Currently I can’t think of any cameras that enable this feature, unlike many camcorder power solutions, so a separate power bank would be required.
The last option, and the one I opted for in this test, is to use a Sony NP-F L-series battery; these lock and snap into place.
Last but not least when it comes to features, latency is close to zero at 40ms at best. This means that what you see through the transmitted HD video is essentially happening in real time.
This video transmission speed is made possible by high-efficiency H.265 encoding, making it an excellent solution for surveillance and focus pullers.