Our Church has a need where one or two Blonder Tongue Modulators might
be of use. I was thinking about hanging RG-6 Coax, using splitters to drive
a few flat panel TVs. Then driving the Coax with one or two BT Modulators
so that the Camera in the Sanctuary would show the service on all the
TVs. Say we have Channel 3 as the Sanctuary Channel and the folks working in the Nursery can watch the service while they are monitoring the kids. Then have say Channel 4 for another function.

So my question is how were these BT Modulators utilized? Did they drive into
a Multiplexer? An Amplifier? Got a better idea?

Thanks

Carl

Carl, what was done was to take A/V signal and use the Blonder Tongue to convert it to a specific RF channel. Then, the output was sent to whatever device that they used to combine the signals and send them over the cable TV network or transmitter.

What many of us has done is to us the BT modulator to take an A/V signal and convert it to RF, then using something like rabbit ears (matched 300 ohm to 75 ohm) and "broadcast" it for short distances. It works very well with a clear signal. I was able to broadcast about 100 feet (all my property) with no snow. And of course, it did the whole house even though the modulator was in the bedroom on the first floor and the work bench was in the basement with foil backed fiberglass insulation.

Carl, multiple modulators are typically fed into a combiner, then that device's output goes to amplifier(s) and splitters as needed. Look up "blonder combiner" on Ebay and a bunch should come up.

Thanks Chris. That was interesting looking up "Combiner" on Ebay.
Noted that they were relatively cheap.

Question, why is there so much of this Blonder Tongue equipment surplused
on Ebay? Is this just normal or is it because of high definition TV obsoleting
this equipment?

Carl