Multiple Viewing Devices
Posted 27 December 2007 - 02:16 PM
What about a daisy chain? For instance, camera to monitor to PC capture card. My monitor has an input and an output. Does that cause problems for the camera as well?
Posted 27 December 2007 - 02:21 PM
Posted 27 December 2007 - 02:49 PM
You are correct. It is perfectly okay to use both the BNC composite video and the S-video concurrently. What is not recommended is splitting either of the outputs to service two different devices at once without taking the precautions previously posted.
Posted 27 December 2007 - 03:52 PM
So, does that mean no daisy chain? You see, I'm thinking that going into and back out of a powered device (in this case my b/w security monitor) is different than just going into a non-powered splitter.
Or is going into and out of a powered device just as detrimental?
Posted 27 December 2007 - 05:58 PM
Posted 27 December 2007 - 06:38 PM
They are talking about 150' cable.
I don't know how long a RG59 22AWG (always shielded) 50 ohms coaxial cable can do even further.
Will longer cable not be having too much DP/DG issues?
Will attenuation be too much thus "hotter" D.A. (e.g., 12dB type) is required?
Posted 27 December 2007 - 07:09 PM
Posted 27 December 2007 - 08:40 PM
Also many hi resolution monitors allow you to run the signal into them and then run them out to another device. All this is allowable.
Posted 27 December 2007 - 08:41 PM
Posted 27 December 2007 - 10:25 PM
I'm not sure what qualifies as a daisy chain, but since the windows software is set up for dual display mode, I'm sure that it's OK. Just in case you don't use it regularly, to get to the dual modee setting, right click on the desktop to get to the dual sequence. Same setup that you would use to run a projector.
Posted 31 December 2007 - 12:02 PM
When you take two outputs (split) from the single camera ourput is the problem scenario, because via Ohms Law you will significantly REDUCE the output "load" that the camera sees. This reduced load causes it to try and drive more current, and *can* (doesn't always) lead to buring out the video amplifier for the output circuit.
But, again, with the output to a SINGLE monitor, and then having the MONITOR output video circuit, in turn, send the signal on to another device should work.
But, not recommended, because what you are doing with each step in the daisy chain is adding an additional "layer" of electronics... which degrades the signal... if you do it more than once, you should go the OTHER route: an amplified Video distribution device... (there are many)...
Hope this helps to clarify!
Posted 31 December 2007 - 12:20 PM
What are the potential issues:
problem sources: not well designed monitors (RFI, color subCarrier leaks, AC 60 Hz humming due to grounding, improperly implemented DC restoration, etc.), cable related (noise immunity, grounding, etc.)
Potential artifacts: AC 60 Hz interference pattern, color subCarrier beating pattern, incorrect black level, etc.
As I said, I've seen all of them in the past.
But if you do not notice any issues and feel comfortable about it, then why bother .
One single input, multiple output video D.A. driving multiple video devices (not that active- driven daisy chain method) would be nice, since it effectively isolates (potential) problems back-flow and crossover from one video device to the other.
Posted 31 December 2007 - 12:38 PM
Best solution, as we've both stated, is a amplified/driven video switcher/splitter - only ONE generation of signal degradation, instead of cumulative, and since it's active, the input side is buffered and thus presents an appropriate (and more importantly non-changing!) load on the source component, in this case the Mallincam output circuit!
Posted 31 December 2007 - 02:39 PM
Posted 31 December 2007 - 04:00 PM
The WATEC is most likely HIGHER resolution than your Sanyo monitor... so effectively you are degrading the signal by passing it in and then back out of the Sanyo, to then go on to a higher resolution device...
Conceptually, this is backwards...
On the other hand, the WATEC doesn't have a "video out"... so you can't go the OTHER way...
You should, therefore and IMO - and no doubt worth every consider using both outputs of your MCHP one for the sanyo, and one for the WATEC. Since the WATEC is so small, you could mount it right on/near your scope, and run very short length of Svideo/RCA cabling (nothing to tangle/trip over and/or be subject to cable wrap).
I just came in from WSO where I finally lashed everything up in preparation for anticipated clear skies tonight.
I take S-video out, through an inline adapter (from Radio Shack) that converts S-video to RCA, then to an RCA to BNC adapter to fit the WATEC input. I then take the BNC output (composite) from the MCHP via the supplied LONG cord over to my 19" monitor Video In... Then I take another RCA from the 19" monitor Video OUT, and have connected it to my wireless transmitter... (which I may just try tonight, or may not)...
I'll take some pictures later tonight if I can remember to take the DSLR outside
That way the only "degradation" of an extra step in the chain, is hooked into mywireless, which would then go into my interior HDTV (through yet more conversions anyways!)... so that end of my chain was destined to be my least "high quality"... (it would always have the "to wireless", the wireless transmission, the "from wireless" and the "from RCA composite to HDTV" conversions all to go through anyways!)
It may help to envision that every time you take a signal, and convert it, the conversion loses information that can never be recovered. So you want the least number of conversions between your source and your highest quality need... and the most number of conversions before your LOWEST quality need...
Note: I am not yet certain the wireless (VFM 1.2Ghz) will be a long term component of my setup; I have to investigate further other users of that spectrum in my vicinity and look into making it as highly directional as possible...
Clear enough skies
Posted 31 December 2007 - 05:10 PM
Posted 31 December 2007 - 05:31 PM
first total light tonight for me - hopefully for you as well!
clear enough skies
Posted 31 December 2007 - 10:28 PM
clear enough skies
Posted 01 January 2008 - 03:31 PM
Posted 01 January 2008 - 05:01 PM
I have par-focalized my Ethos in the flip mirror with the MCHP... the REAL challenge is in observing where the CENTER of that 100 degree FOV actuall *is*...
sometimes I "cheat" - and use my 5mm illuminated reticle to NAIL things...
My hearts desire is to have a full, true 2" flip mirror that will work in this setup (so I can also use my 31T5 and 22T4 in the Vixen...) but, the Van Slyke Slider I bought used is too "deep" to leave enough in/back focus to come to focus with the MCHP
I'm still looking for a solution to THAT problem..
BTW: in the picture that red/black braided wire is the custom power harness I made to go from a Radio Shack 3A AC/DC power supply to the Watec... once I confirm with Rock that it will also be safe to use for the MCHP, I'll use it to power that as well... I'm all about losing too many wires
I wish that the makers of flip mirrors would publish full dimensional specifications, etc...
I'm currently researching if there are alternatives that would allow me to use the Van Slyke (cause it is really well built and very nice!)... else it'll be up for sale...
clear enough skies!