Mofi 4500, strange yagi antenna results

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blakesgst
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Mofi 4500, strange yagi antenna results

Post by blakesgst » Mon Apr 26, 2021 2:23 pm

Hi Guys, new to the forums and hope I'm posting in the correct spot. Recently I decided to go on a long road trip and am using nomad internet with a mofi 4500. With the standard Mofi antennas I was able to get 10mbs down and 2mbs up out in the sticks which was acceptable but I figured i'd try to get more and ordered a couple of wilson 50ohm directional antennas. Since connecting them I've been getting weird results and am hoping someone can help. I've tried several combinations of wilson/mofi antennas connected to the primary and secondary antenna ports and this is roughly what I'm getting.....

2 standard Mofi antennas - 10mbs down, 2 mbs up
2 standard mofi antennas with a janky home made carboard/foil reflector - 10-14mbs down, 7mbs up
1 standard mofi antenna connected to the primary port, 1 wilson connected to the secondary port - 10mbs down 6mbs up
2 wilson antennas connected, primary and secondary - 30+mbs down and .5 or maybe 1mbs up

Am i doing something wrong using both wilson antennas? The download speed is great but the upload speed plumets so bad I'm struggling. Why is the home made foil reflector with the standard antennas the most balanced/stable? Any suggestions are appreciated.

Thanks

MattB29
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Re: Mofi 4500, strange yagi antenna results

Post by MattB29 » Tue Apr 27, 2021 8:58 am

You need to look to see what bands (even towers might be changing) you are connecting to and also if you have carrier aggregation. That said there is many funny things that happen with signals from various antenna setups. Things like cables, connectors, distance run from antenna to modem and black magic all seem to affect what you will get.

I recently changed my antenna setup that was consistently connecting to Band 12 (AT&T)no carrier aggregation to a MIMO flat panel antenna that gives me Band 2 and Band 66 with CA. It took my D/L speed to over 60MBS down at times but my upload is at max only 3-4MBS often dropping to less than 1MBS. While it was always 5-7MBS for U/L on Band 12. The D/L on Band 12 was only at peak about 12MBS and often about 3MBS.

Try things until you are happy is about all I can suggest.

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Didneywhorl
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Re: Mofi 4500, strange yagi antenna results

Post by Didneywhorl » Tue Apr 27, 2021 11:33 am

Is your Wilson antenna and cabling 50 Ohm or 75 Ohm?

blakesgst
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Re: Mofi 4500, strange yagi antenna results

Post by blakesgst » Tue May 04, 2021 1:44 am

Thanks for the replies and suggestions guys. Sorry for the late response back as I have been out of town.

I spent a day last week scanning bands, locking on to each one individually and testing using the mofi interface. After several hours of testing and retesting I found that band 2 gave the most consistent results. I was also able to locate exactly what tower Im connecting to. It's still not any better than when I had it on auto. This evening I played around with antennas again and am seeing the same results.....

Standard antenna primary with aluminum foil reflector, wilson secondary 20mbs download , 4mbs upload (best results)

Wilson antenna primary and secondary, 20 mbs download, .2(point 2, not 2) mbs upload worst results

Standard antenna primary and secondary, 16 mbs download, 4 mbs upload

etc etc

My wilson antennas are 50 ohm. I just really expected to see a gain using BOTH wilson antennas. I certainly didn't expect the standard mofi antenna in the primary slot to give the best results AND I deffinitely didnt expect to see both wilson antennas give me horrid upload results.

Any other suggestions or things I should try, a different antenna perhaps? Here is a link to the antennas and cables I purchased....

https://www.amazon.com/gp/product/B00J1 ... UTF8&psc=1

Not sure what antenna that link is going to show since there are multiple options but I purchased 2 of the 4g wideband diretional antennas.

https://www.amazon.com/gp/product/B07J6 ... UTF8&psc=1

Thanks again,

Blake

Dr-BroadBand
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Re: Mofi 4500, strange yagi antenna results

Post by Dr-BroadBand » Tue May 04, 2021 8:07 am

The LMR-400 cable is LOW loss, it's not NO loss.
May be why the MoFi is doing a better job with it's little antennas.

A better design would to have no cable or very short cable in your set.

Would be helpful if you shared your signal numbers
Attachments
Signal Numbers.png
Signal numbers
LMR-400 Loss.JPG
Cable Loss

Dr-BroadBand
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Re: Mofi 4500, strange yagi antenna results

Post by Dr-BroadBand » Tue May 04, 2021 8:09 am

Here is an example of an PoE setup with very short cables :shock:
Attachments
PoE Setup2.jpg
Poe Setup

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Re: Mofi 4500, strange yagi antenna results

Post by gscheb » Tue May 04, 2021 8:19 am

Dr-BroadBand wrote:
Tue May 04, 2021 8:07 am
The LMR-400 cable is LOW loss, it's not NO loss.
May be why the MoFi is doing a better job with it's little antennas.

A better design would to have no cable or very short cable in your set.

Would be helpful if you shared your signal numbers
Don't think he has LMR400. The link shows RG58

Dr-BroadBand
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Re: Mofi 4500, strange yagi antenna results

Post by Dr-BroadBand » Tue May 04, 2021 8:43 am

Good catch :geek:

"Houston we have a problem" :lol:

gscheb
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Re: Mofi 4500, strange yagi antenna results

Post by gscheb » Tue May 04, 2021 9:21 am

blakesgst wrote:
Tue May 04, 2021 1:44 am
spent a day last week scanning bands, locking on to each one individually and testing using the mofi interface. After several hours of testing and retesting I found that band 2 gave the most consistent results. I was also able to locate exactly what tower Im connecting to. It's still not any better than when I had it on auto. This evening I played around with antennas again and am seeing the same results.....

Standard antenna primary with aluminum foil reflector, wilson secondary 20mbs download , 4mbs upload (best results)

Wilson antenna primary and secondary, 20 mbs download, .2(point 2, not 2) mbs upload worst results

Standard antenna primary and secondary, 16 mbs download, 4 mbs upload

My wilson antennas are 50 ohm. I just really expected to see a gain using BOTH wilson antennas. I certainly didn't expect the standard mofi antenna in the primary slot to give the best results AND I deffinitely didnt expect to see both wilson antennas give me horrid upload results.

Any other suggestions or things I should try, a different antenna perhaps? Here is a link to the antennas and cables I purchased....

https://www.amazon.com/gp/product/B00J1 ... UTF8&psc=1

Not sure what antenna that link is going to show since there are multiple options but I purchased 2 of the 4g wideband diretional antennas.

https://www.amazon.com/gp/product/B07J6 ... UTF8&psc=1
Hello,
How long are those wires? Are they 25 foot ones?
Also just for fun try swapping which antenna lead goes into the main on the modem. Allot of times one antenna can have better signal than the the other. When you are in a fringe area 1-3 Dbi can make a difference.

blakesgst
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Re: Mofi 4500, strange yagi antenna results

Post by blakesgst » Tue May 04, 2021 11:14 am

Morning guys,

I forgot to mention I have tried swapping all the antennas per side and per cable each time with the same results. So are my cables an issue and if so, what do I need to get?

Thanks,

Blake

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