Paul As John suggests, you probably need a video monitor (rather than a PC monitor), which is probably 525/60 video standard, the HP receiver being of US origin. It doesn't have to be ancient; you can probably still buy such things new, although you probably want to borrow one initially.
If you look at the green signal on a 'scope, you should be able to see line sync pulses at 64us intervals, and by adjusting the timebase, see field sync signals at 16.7ms intervals (for 60 Hz) or 20ms intervals (for 50Hz). I would expect standard video signals to be negative-going sync, amplitude 1V pk-pk when terminated in 75 ohms. The sync pulses should be about 0.3V amplitude, with 0.7V video. That confirmed, you know the standard of video monitor that you require. If your monitor does have a separate sync and you have problems getting the monitor to work with the sync on green signal, it is very simple to construct a simple low pass filter to strip the video signal off the composite signal, leaving a composite sync, and there are standard sync separator ICs available to separate the line and field syncs (or do it discretely) if you really have problems. Best regards Neil R. Barker CEng MIET HonFSEE MIEEE Manager Quality Engineering e2v technologies (uk) ltd 106 Waterhouse Lane Chelmsford Essex CM1 2QU UK Tel: (+44) 1245 453616 Fax: (+44) 1245 453571 Mob: (+44) 7801 723735 P Please consider the environment before printing this email. From: John Woodgate [mailto:[email protected]] Sent: 19 December 2007 22:49 To: [email protected] Subject: Re: Receiver Video output question In message <[email protected]>, dated Wed, 19 Dec 2007, PAUL STOVER <[email protected]> writes: >We've an HP8542E Receiver with an HP 85420E RF Filter section. The rear >of the Receiver has R - G(sync) - B display video out bnc connectors >and an aux video bnc. We have been completely unsuccessful in finding a >way to get this to an external monitor. > >Anyone have a solution? Well, have you got an ancient monitor that will accept RGB with synch-on-green? If not, you may be able to use a monitor with RGB + Synch, by connecting Green and Synch together. You probably can't use a monitor with separate horizontal and vertical synch inputs. You may need to look at the output signals with a scope, to see if they are positive-going or negative-going. Sent by E2V TECHNOLOGIES PLC or a member of the E2V group of companies. A company registered in England and Wales. Company number 04439718. Registered address 106 Waterhouse Lane, Chelmsford, Essex, CM1 2QU, UK. - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. Website: http://www.ieee-pses.org/ To post a message to the list, send your e-mail to [email protected] Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas [email protected] Mike Cantwell [email protected] For policy questions, send mail to: Jim Bacher: [email protected] David Heald: [email protected] All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
