On 01/28/05 23:03 ET, AHEM said...
There's a number of RF field strength meters on
the market. Here's a couple of places to get
started:
You probably heard that term loosely used by a ham radio operator.
Field strength meters have a small antenna and are used to measure the intensity of the FIELD broadcast by a transmitting antenna. You are talking about signal level meters.
Edit: Ah. I see you addressed this.
On 01/29/05 00:10 ET, jeffh9020 said...
What I'm trying to measure is the level
of video modulation, as opposed to RF Level Output.
This kind of adjustment isn't found on homeowner
equipment.
This control affects the contrast level (among
other things) in the generated picture. If they're
not set to a common standard, you get varying
levels of contrast across the different channels
you're sending to the customers.
How could you possibly set them to a common standard if this kind of adjusment isn't found on homeowner equipment? I understand that you might want to see what the modulation levels are if you need to tell a person why channel A or B, or the modulator, just plain sucks, but is there something that you could do about it?
Actually, something comes to mind. Let's imagine for a moment that the home modulator does not have AGC on its input. That costs money, so it probably doesn't. Then, since picture is Amplitude Modulation, changing the video signal level will change the modulation level, and this can be done outside the modulator.
When you or your clients look at channels or the results of this experiment, note that since all televisions DO have agc, you will not actually see what your adjustments have done. For that you need a Production Monitor.
This message was edited by Ernie Bornn-Gilman on 01/30/05 14:23 ET.
