[Heathkit] help needed

[Revcom]

We have split outputs of cameras 4 ways with resistrive splitters,
no problems.  Output is usually 1V, you loose about 4-8db on the
split which is still within reach of most any applications.
Plain ole' cable TV splitters, cheap ones, use adapters to get to
BNC/RCA or whatever. RadioShack as well as many sources have
them.


----- Original Message -----
From: "Jim Shorney" <jshorney at inebraska.com>
To: <heathkit at mailman.qth.net>
Sent: Saturday, December 15, 2007 1:15 PM
Subject: Re: [Heathkit] help needed


> On Sat, 15 Dec 2007 09:06:49 -0800, Edward B Richards wrote:
>
> >Can someone guide me to where I can find information on a simple
> >resistive splitter/combiner? I want to split the output of a video camera
> >two ways, one to a monitor and one to the modulator for ATV. Everything
> >is 75 ohms. I can't find it in the ARRL handbook. Thank you.
>
> There are several considerations here. Are the monitor and the modulator
both
> actually 75-ohm resistive loads, or do they just have a 75 ohm connector?
Can
> either be reconfigured for high imedance? Does the monitor have
loop-through
> capability?
>
> If your modulator has a monitor output, it's easy; I'm assuming that it
> doesn't, or you wouldn't be asking the question.
>
> A resistive splitter will incur loss that you may or may not be able to
> recover with gain in the monitor and/or modulator. If the monitor has
> pass-through capability and can be configured for high impedance, you're
set.
> Loop the video through the monitor and put the modulator at the end of the
> line. If the modulator can be configured for high impedance, use a "T"
> connector to pick off video for the modulator and put the monitor at the
end
> of the line. If neither scenario works for you, this handy little circuit
> from the computer world can be scaled down to a single line of video with
two
> (or more) outputs:
>
> http://www.anatekcorp.com/driving.htm
>
>
> --
> Ham Radio NU0C
> TR7/RV7, TR6/RV6, T4XC/R4C, L4B, NCL2000, SB104A, R390A, GT550A/RV550A,
HyGain 3750, IBM PS/2 - all vintage, all the time!
>
> HyGain 3750 User's Group - http://groups.yahoo.com/group/HyGain_3750/
>
>