Following up on my previous brief comment, I dug up a frequency response curve for the Holland HLSJ that I tested a while back. As can be seen from the plot, the HIGH port extends all the way through UHF frequencies to beyond 1 GHz, the limit of the selected display. If tested on a wider frequency band, I'd expect it to extend well beyond 2-3 GHz with minimal insertion loss.
The plot line that begins on the left side of the screen is the pass band for the LOW port, the trace on the right is the HIGH port.
A UVSJ would have a similar plot as shown in the second graph for the Radio Shack 15-2586.
Hope this aids in the understanding of the function of diplexers.
Cheers
Last edited by ADTech; 13-Jul-2012 at 2:40 PM.
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