RF modualator has delay from live source
Converting HDMI/SDI to a Digital RF signal for TV tuners to understand typically can take up to 50ms for the decoder to process and transform into a signal that a TV tuner can understand.
From there, the TV tuner needs to convert the DIgital signal back into a Moving picture. Transforming from a Digital signal to a moving image as you typically see it, highly depends on the tuners' processing speed and memory. On average, you can expect to see a 200-400ms delay on most TVs from the source through coax and then onto your TV. Results can vary again depending on the tuner's processing power, speed, and TV size. A smaller 30inch screen can process the data faster than an 80inch TV, mainly due to fewer processing requirements for that size of image needed to be drawn.
In most cases, some TVs, such as newer 4K TVs, have cheaper tuners as they expect most customers to use the TV's IPTV side for Netflix, Hulu, etc. To sell the TV in the USA/Canada/Mexico, manufacturers must outfit the TV with at least an ATSC(over the air) tuner or a dual tuner for Cable/Air. This turns out to be the cheapest tuner they can find, which results in slower processing power and longer delays.
Most of our modulators have built-in low latency(delay) mode to force the TV tuner to process the data faster, resulting in a lower delay. In some cases, individual tuners do not like this setting, which results in frame drops due to the tuner dropping frames to keep up with the demand of data being sent. We allow adjustment of this setting at the cost of a slight increase in delay. Refer to your user's manual for the Vecoax Modulator you own.