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-   -   Antennas Direct 91XG Water Infiltration of Balun? (http://forum.tvfool.com/showthread.php?t=15162)

Tim 4-Jan-2015 10:19 PM

Antennas Direct 91XG Water Infiltration of Balun?
 
We had 4 inches of rain in our area overnight and today I am experiencing low signal strength on UHF stations. My antenna system is a 91XG for UHF and a Y10713 on VHF combined with a UVSJ and then running 50 ft to a distribution amp. Following the heavy rain I have experienced no decrease in signal strength on the VHF side but all signals are down on the UHF side. The weakest stations are completely gone. Several stations that were not at max strength before but had good quality are now weaker and have dropped in quality.

Has anyone ever experienced water infiltration of the balun on the 91XG? It is about the only point in the system where I would have any concerns about water causing a problem. Everything else is very well sealed. If water infiltration is the problem, I would expect it to clear up after a few days of nice weather dries it out.

ADTech 5-Jan-2015 2:39 AM

We have one every once in a while.

As it turns out, when the factory changed the mold for the enclosure a few years back (when they transitioned from a traditional ferrite matching transformer to the PCB version), they forgot to include the weep holes in the new enclosure.

Call in during business hours and tell customer service you need a new "91XG Balun Assembly" and tell them specifically to be sure that the replacement must have weep holes drilled in the case before the replacement ships out. Depending on who you get, they may or may not be clear on what you mean so just tell them to include that in the message to the person who ships out warranty replacement parts. That person does know the routine.

If you want to drill out the enclosure yourself, it's two small 1/16" holes on the side of the plastic enclosure opposite the balun element. When reassembling the balun assembly to the boom, put a gob of silicone sealant into and around the captive nut of the enclosure, then attach it back to the boom using the original screw.

You may need to replace the coax from the balun as it might have turned into a water line.

Tim 5-Jan-2015 2:50 AM

Thanks for the info ADTech. I spoke to Steve today. He had never heard of that problem but put me on hold, checked it out, and came back on the line and said he would be shipping a new one out to me as soon as they drilled the weep holes. Great customer service!

Tim 10-Jan-2015 8:48 PM

I received the new balun assy and had planned to install it today. However 45 degrees is a little chilly and makes raising and lowering the telescoping mast a real chore (six decade old arthritic hands don't work well in the cold!)...think I will wait for a warmer day! In the meantime, evidently the existing balun has dried out and reception has returned to normal. I will make sure everything is well sealed around the mounting hole when I do get a nice day to install it.

Stereocraig 11-Jan-2015 4:54 PM

Quote:

Originally Posted by Tim (Post 48694)
I received the new balun assy and had planned to install it today. However 45 degrees is a little chilly and makes raising and lowering the telescoping mast a real chore (six decade old arthritic hands don't work well in the cold!)...think I will wait for a warmer day! In the meantime, evidently the existing balun has dried out and reception has returned to normal. I will make sure everything is well sealed around the mounting hole when I do get a nice day to install it.


Be sure to use a true 100% RTV silicone, such as GE and NOT that siliconized latex caulk.
I have seen the siliconized latex version corrode metal, including turning PCB copper a bluish green.

Be generous w/ the gob =d

welkin 21-Mar-2019 2:27 PM

Hello,

Where is the location of the weep hole(s) supposed to be located? I lost a balun and suspect this to be the cause.

ADTech 21-Mar-2019 4:41 PM

See post #2, I described where I drill them. A hole in each of the corners of the bottom of the housing that are closest to the F-connector. Do not drill in the corners directly under the driven element.



You can do this "in the air", if you choose, but you might get wet!



If you need a photo, let me know and I'll post one up here.

welkin 21-Mar-2019 5:56 PM

Thanks for the clarification.

Nascarken 24-Mar-2019 12:08 AM

Quote:

Originally Posted by welkin (Post 60954)
Thanks for the clarification.

Well Hello there antenna Direct 91x,come's with a life time
On all parts,shipping RIGHT to your house free.
They stand behind their ANTENNAS DIRECT 91xg.
Call asap you will receive a new one.
And on the new one use some black RTV
On the seem.And it will never happen again
Good luck!


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