[MikeBear]

Originally Posted by rabbit73

I like Mike's idea of a preamp for UHF, but not for the stronger VHF signals, using separate antennas.

You can make a preliminary test with what you have now to see what it will do with KTMF if you limit the Stacker to receive UHF only.

Test No. 1
 Stacker > 
          \ UHF
           UVSJ > LNA200 > coax > power > TV
          /                      inserter
 VHF input of UVSJ not used

Using Mike's idea:

Test No. 2
UHF Ant > FM trap > preamp > 
                            \
                            UVSJ > coax > power > TV
                            /            inserter
     VHF Antenna > FM trap >
UVSJ must pass power on UHF side like
Radio Shack 15-2586 or
Antennas Direct EU385CF

http://www.radioshack.com/vhf-uhf-go...r/1502586.html

but that will not keep the strong VHF signals that come in on the UHF antenna out of the preamp, so I prefer this which uses the UVSJ to keep VHF and FM out of the preamp:

Test No. 3
          UHF Antenna > 
                       \
                       UVSJ > preamp > coax > power > TV
                       /                     inserter
VHF Antenna > FM trap >

There is the possibility that if Test No. 1 gives you KTMF, you might be able to modify the Stacker to use the UHF and VHF sections as separate antennas.

Your #3 way wouldn't keep VHF out of the preamp. On the contrary, it would amplify the VHF directly from the VHF antenna side. It would also amplify the UHF side, which is the only side that needs amplifying

Ok, so he does this instead, it would stop any VHF from being amplified, even from the VHF antenna:

UHF Ant > Pico UVSJ > FM trap > preamp > 
             /                           \
    VHF side capped                   RS UVSJ > coax > power > TV
                                         /            inserter
                VHF Antenna > FM trap >


RS UVSJ (2nd one) must pass power on UHF side like
Radio Shack 15-2586 or
Antennas Direct EU385CF

So, he'd have TWO UVSJ's, the 1st one on the UHF side only, would be the cheap smaller Pico or Holland type that's power-pass on the VHF side, (which we don't care about since that's not used in this case) That would strip out any VHF signals from the UHF antenna. The 2nd UVSJ (that combines both UHF and VHF antennas) would be the RS one that's power-pass on the UHF side, and combines both UHF and VHF antennas.