VK4ZXI

  Converting CCTV lens from video auto iris to DC auto iris Summary It seems relatively easy to convert a video auto iris CCTV lens to DC auto iris and for a modern camera to control the lens correctly. I was able to convert a sophisticated expensive CCTV lens to DC auto iris, which otherwise was unusable.    However, I give no guarantee that it will work with any other lens, although I think the principle is the same.   If camera control is not possible or desired, it is possible to at least open the lens's iris with a voltage through a series resistor applied to the drive motor with the correct polarity. The problem I had bought a Pentax motorised zoom and focus lens for use in my amateur TV studio with the idea of using it on a remote-controlled tripod as part of a one person operation. Motorised lens are not cheap ($600), but I bought a new, but old stock, lens cheap (<$100).   The main problem was that the lens used video...

HD DVB-T HiDes HV-202E ATEM TV Studio DVB-T DATV all working Finally, I have all the pieces connected for a high-quality, live DVB-T TV studio and TX. My interest has been in establishing a high quality, video and audio, DATV system. This post covers the full working system, albeit small-signal. The details of each of the components are covered in earlier posts. The main components of the system are: HiDes HV-202E, self contained DVB-T TX with HDMI input: http://vk4zxi.blogspot.com.au/2014/07/hides-hv-202e-dvb-t-self-contained.html BlackMagic Designs ATEM TV Studio: http://vk4zxi.blogspot.com.au/2014/06/datv-dvb-t-blackmagic-designs-atem-tv.html High-definition digital SLR and CCTV video cameras: http://vk4zxi.blogspot.com.au/2014/06/dslr-cameras-for-live-tv-not-so-simple.html , http://vk4zxi.blogspot.com.au/2014/06/hd-cctv-cameras-cheap-quality-live.html The front of the operator console. The ATEM TV Studio is PC-based and is mounted in a small stand, just viable behind the...

DATV DVB-T BlackMagic Design ATEM TV Studio: Proof of concept An objective has been to get high quality video and audio, as well as TV production studio abilities for my DATV DVB-T system. Production studio abilities includes the capacity to switch between multiple live TV cameras, recorded media and overlays, such as my call sign. I originally experimented with software production systems, mainly aimed at network feeds, such as Vidcaster and Open Broadcaster. The commercial Vidcaster software has a virtual camera that can be the input video stream for a HiDes's device, such as the UT-100C via PC2TV. This required a fast PC, a HDMI video capture card from a DSLR camera, the Vidblaster software, the PC2TV software and the UT100C all working properly; a difficult feat many of us have stumbled on. An alternative is to use a hardware production studio. The BlackMagic Design ATEM TV Studio is very suitable and a reasonable price, about $1000, given its capabilities. It is desig...

HiDes CCHDTV camera and DVB-T modulator DC-100 (preliminary) I received a HiDes DC-100 (US$250 for camera, $100 for lens) last week but did not have much time to set it up, other than to verify it works. With a bit more time tonight I have a very nice Full HD image from it. The lighting was bad, but a still a good clear image. The DC-100 transmits both a SD and HD channels as can be seen in the channel list. The camera is running on its default setting of 177 MHz, 6 MHz bandwidth, but over a cable with an attenuator. The image is 1080P 30 FPS. As a result there is some flicker from the 50 Hz lights. I will put up some photos of the device and its internals later. CCHDTV is an emerging standard of DVB-T cameras designed to run on existing coaxial systems in buildings and institutions. The devices all seem to be based on the ITE modulator chips. Google CCHDTV for more information. The DC-100 uses a standard CCTV SDI camera, either 2 or 5 Megapixel, the converts the raw S...