I'd avoid the TV splitters, quality is all over the place and the lower
frequency limit varies. You would really want to measure the loss at 1.8
MHz before committing to use one.
I've been playing around with satellite TV splitters (most specifically
DirecTV splitters (
https://www.ebay.com/itm/Direct-TV-DTV-Splitter-4-Way/233066815876? )
These are spec'ed from 2 GHz down to 2 MHz and if you shop around you can
find them for a lot less than a new CATV splitter. The satellite stuff has
to work since it costs them bucks for service calls.
One other advantage is that one port has DC pass through, if you need it.
Pete k1zjh
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