Dual input antennas

[BroadcastDoc]

Anyone have experience with them?

So far, the ones that I'm familiar with have had plenty of intermod issues!

[K9EZ]

Anyone have experience with them?

So far, the ones that I'm familiar with have had plenty of intermod issues!

There was an article in one of the trades about the problem in Minneapolis with a dual feed. In some areas the analog would get hashed out due to the difference in the patterns of the antenna for HD and analog.

[KPJL FM]

KLH has one, ERI LYNX, I don't like it. We had some coverage change when it went up on ch18 tower. 200 pound isolator/filter mounted on the tower, too.

Just put HD on an existing SHPX, no problems.

[KPJL FM]

Wasn't the Minnehappyolis set up a co-located dual antenna, not a dual input antenna?

[BroadcastDoc]

Ah ha. You gave yourself away....

[K9EZ]

Ah ha. You gave yourself away....

INDEED!! BUSTED!!!!

I was wondering why I couldnt find KPJL.....

[K9EZ]

Wasn't the Minnehappyolis set up a co-located dual antenna, not a dual input antenna?

I **THOUGHT** it was KNOW with a dual input antenna, and they had to go high level combine instead.

Oh ya der hey.. doze Mini-soda people are fun.

[BroadcastDoc]

Yeah, that's been the problem with "space combining" with separate antennas.

The nulls in the analog signal are falling in different places than the nulls from the digital signal. There can be an obscene differene in carrier ratios in those spots!

[KPJL FM]

Ah ha. You gave yourself away....

I wasn't trying that hard.....

There is a story to the KPJL, it's the dummy station I used when I'd set up a SS or SS32. And, its my initials, which is the way the installers named the directory.

[NECRAT]

I have travelled to over 500+ sites in my day, and have only seen 2 installations using interleaved bays (WXXI-FM Rochester, using a 6x2 Dielectric, and WPXY/WCMF using a 6x3 Shively) , and 2 with a dual input antenna (WBUF-FM using a 2 bay Shively, WKNE-FM using a 2 bay ERI).

Maybe there have been more, I am not familiar with other sites installations.

I've only been able to Monitor WKNE-FM in HD , and noticed that there are areas where the Analog is really almost non existant, but the HD signal is rock solid, and others where it is the exact oppisite. Thankfully the station's time allignment is perfect so when it does drop its not a big deal...