Help on diplexers

[captkirk245]

I had a Radio Shack Omni Antenna and a Directv Dish signal going threw 2 diplexers it worked fine. Now I installed a Directional Antenna to replace the Radio Shack Omni. When I do this the signal of the Directional Antenna kills the signal of the Directv Signal. I have to disconnect the Directional Antenna then I get the Directv Signal back. Both won`t work at the same time.I have a Samsung SIR-TS160 which has a connection for both Dish an OTA. I`m using a DB2 Bowtie Antenna from Antenna Direct (which by the way the signals are great. I can get all the OTA HDTV Channels now the weakest is 77% all the rest are at 100%). Any suggestions? Thanks, Kirk

[FullBandwidth]

Any chance your new antenna has a preamp that is powered over the coax? That could potentially interfere with the 13VDC/18VDC signal that your DirecTv set top box sends out to the dish to select polarity on the LNB. If this is the case, you could try moving the preamp to the "near" side of the diplexer (i.e. after it's split back into two separate signals) and putting a DC blocker after that. Or, depending on your signal quality you may be able to ditch the preamp altogether.

If there is no preamp, are you using the same set of diplexers as before?

[captkirk245]

For the Input but ended up running another rg6!