View Single Post
Old 19-Dec-2016, 10:06 PM   #14
rabbit73
Retired A/V Tech
 
Join Date: Aug 2012
Location: S.E. VA
Posts: 2,160
Quote:
Is this better than the other VHF antenna I already have?
In theory the 2476 has a little more gain than your VHF antenna, but I don't know of any actual measurements that compared them. The 2476 also has a tilt feature that might help.

All of your NBC signals have problems; you must be prepared to experiment.
Quote:
I can keep the Mohu pointed toward boston and one of the above toward WJAR? With the pre-amp built into the Mohu I am guessing I would have to combine down in the basement.
Yes, that would probably the best way to do it.
Quote:
Is there a decent way to combine the two different types of uhf antennas
Combining two UHF antennas aimed in different directions is not easily done. Sometimes it works, sometime not. If you use a splitter in reverse as a combiner after the power inserters for the preamps, when the same signals from each antenna reach the combining point, they might interfere with each other if they don't arrive in phase (at the same instant).

I suggest you try another antenna and preamp for WJAR without combining. If it works, then try combining. If you don't get all the channels you had when the antennas were separate, then combining that way will not work for you.

If the combining doesn't work, you have several alternatives.

1. You can run the NBC antenna coax to just one TV, and have an A/B switch to select which antenna is needed. You might need to rescan if that TV isn't able to add a channel after scan.
2. You can run the main antenna system to the TV antenna input, and connect the NBC antenna to a separate tuner, like the CM7003, with its output connected to the TV aux input.
http://www.avsforum.com/forum/186-co...erter-box.html
3. If you want NBC added to the main coax for all TVs, you will need a custom combiner for that NBC channel, made by Tin Lee Electronics, which will be more than $100.
http://www.tinlee.com/PDF/AC7-custom...kup%20Info.pdf

Jan Jenca, in Slovakia, sells a less expensive version on ebay.
http://www.antenne-komponenty.eu/eng...zlucovace.html

Attached Images
File Type: jpg antenna combinerby jan_jenca 2_1.jpg (55.2 KB, 1355 views)
__________________
If you can not measure it, you can not improve it.
Lord Kelvin, 1883
http://www.megalithia.com/elect/aeri...ttpoorman.html

Last edited by rabbit73; 19-Dec-2016 at 10:57 PM.
rabbit73 is offline   Reply With Quote