DP727L15 - 15dBi 4G LTE Directional Antenna Review (Updated with comparisons)

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swwifty
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Re: DP727L15 - 15dBi 4G LTE Directional Antenna Review (Updated with comparisons)

Post by swwifty » Thu Oct 11, 2018 8:40 pm

ph34rful wrote:
Thu Oct 11, 2018 8:17 pm
Thanks for the info! Any chance of the same for the DP1727X15? https://ltefix.com/shop/antennas/1700-2 ... l-antenna/

I'm curious how their performance compares at the higher frequencies.
I would guess its basically the same. The higher up in frequency you go, typically the more gain its possible to get (at least in a wideband antenna that is)

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Re: DP727L15 - 15dBi 4G LTE Directional Antenna Review (Updated with comparisons)

Post by JimHelms » Fri Oct 12, 2018 8:07 am

ph34rful wrote:
Thu Oct 11, 2018 8:17 pm
Thanks for the info! Any chance of the same for the DP1727X15? https://ltefix.com/shop/antennas/1700-2 ... l-antenna/

I'm curious how their performance compares at the higher frequencies.
Sure can:
DP1727X15.pdf
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Re: DP727L15 - 15dBi 4G LTE Directional Antenna Review (Updated with comparisons)

Post by swwifty » Sat Oct 13, 2018 8:21 am

I ran through another series of tests a few days ago, to compare the antennas again on a different day. This wasn't a 100% fair test, because of a few things.

1. Weather was a little bit "better" I guess you could say? Less humidity and clear skies.
2. I compared the flat panel antennas and the yagis, on a pole about 10 feet up, vs about 5 feet up (as before). I recently recieved my antenna setup, and I have two poles that are sleeved, so I can have a 10 foot pole. The results from this were rather interesting.
3. I had to use my 10 foot LMR400 cable attached to my 4 foot LMR195 cable, because my 4 foot one wouldn't reach that high. This might have introduced a little bit more of signal loss.

17dbi Yagis on Band 2 on just a 5 foot pole (Keep in mind this is already about 25 feet in the air, on a porch off my house).
Screen Shot 2018-10-11 at 5.21.17 PM.png
Picking up another cell off (that is slightly interfering) in the distance with these yagis (I didn't see this on the 15dbi panels)

Screen Shot 2018-10-11 at 5.20.36 PM.png
Speed test with 17dbi yagis on 5 foot pole.
Screen Shot 2018-10-11 at 5.22.21 PM.png
Now, compare the 17dbi yagis, when adding a 5 foot extension ontop. Keep in mind, this is only 5 feet higher.
Screen Shot 2018-10-11 at 5.36.22 PM.png
Even that distant interfering cell comes in stronger.
Screen Shot 2018-10-11 at 5.36.49 PM.png
Speed test:
Screen Shot 2018-10-11 at 5.38.08 PM.png
It's pretty clear that SINR improved quite a good bit by just going up 5 feet higher in the air. This is exciting, cause once I mount these on the roof, they will be about 10-15 feet even higher than that! I don't know why my upload speed was slower, but there is a lot of factors going on here that could be contributing. I did some tests on a few other speed test sites, and saw this:
Screen Shot 2018-10-12 at 2.58.58 PM.png
It's really tough to test the full throughput between myself, and the tower, when I have to go all the way over the internet to do an actual speed test. The "slowness" could be coming in after the radio link, on the way across the internet to the speed test site. It's really hard to say either way.
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swwifty
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Re: DP727L15 - 15dBi 4G LTE Directional Antenna Review (Updated with comparisons)

Post by swwifty » Sat Oct 13, 2018 8:41 am

Now, here's the 15dbi flat panel locked to band 2. (also on the high 10 foot pole)
Screen Shot 2018-10-11 at 5.57.23 PM.png

Keep in mind here that SINR looks better on this, but this was just a snapshot. It was fluctuating between about 11-14, the same with the Yagis.
Screen Shot 2018-10-11 at 5.57.37 PM.png
Notice, no detected other cell.

Speed test:
Screen Shot 2018-10-11 at 5.59.29 PM.png

And just for completeness sake, tested on both bands (notice band 2 was selected this time):

Screen Shot 2018-10-11 at 6.06.37 PM.png

LTE Info:
Screen Shot 2018-10-11 at 6.06.55 PM.png
Speed test:
Screen Shot 2018-10-11 at 6.08.10 PM.png
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Re: DP727L15 - 15dBi 4G LTE Directional Antenna Review (Updated with comparisons)

Post by swwifty » Mon Oct 22, 2018 4:18 pm

I finally got my outdoor antenna mount setup, and did a final test on the roof. The results actually surprised me.

17dbi gain yagis signal strength
Screen Shot 2018-10-18 at 12.36.03 PM.png
Speed test
Screen Shot 2018-10-18 at 12.38.07 PM.png
Now compared to the flat panels locked to band 2.
Screen Shot 2018-10-18 at 1.00.35 PM.png
Speed test of the flat panels locked to band 2
Screen Shot 2018-10-18 at 1.01.57 PM.png
These results surprised me, because all the way through my testing the yagis and the flat panels have been neck and neck on band 2. That being said, I never tested the yagis up on the top of the mountain behind my house, so I don't know if they would do better there than the flat panels or not, but I suspect they will (I might do that test later). I have a feeling that the closer I get to a line of sight setup, the better these yagi antennas will perform against the flat panels. You can see though with the yagis that SINR is better, and so is RSRP (in the exact same location, and within about 20 mins these tests were run of each other)

For overall comparison, this is the flat panels on both bands (not much faster than just the yagis on band 2 by themselves):
Screen Shot 2018-10-18 at 1.08.12 PM.png
A picture of the antennas, and how high they are on the roof:
roof pic.jpg
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swwifty
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Re: DP727L15 - 15dBi 4G LTE Directional Antenna Review (Updated with comparisons)

Post by swwifty » Mon Oct 22, 2018 4:46 pm

A couple of other thoughts:

1. As part of my adventures into learning LTE, etc, I recently purchased a SDR (if you don't know what this is google it). I've been learning a ton about radio, and one thing I recently realized is this comparison might not be 100% fair for the yagis. Why? Well, LTE transmits uses mimo, which is transmitted via two streams in a X polarity (one +45 one -45 degrees). You can see this described and pictured in various antennas you can buy. That being said, the yagis this entire time testing, I had one mounted vertically and the other horizontal to try and compensate for this and I thought it was no big deal. Fast forward to messing around with my SDR, I learned that receiving antennas have to be oriented in the direction of the polarization of the transmitting antenna, or they will lose signal strength (I tested this with a few FM stations that transmit vertically polarized and with the antennas completely horizontal I can't hear the station at all!). I think this might account for why the flat panels have always seem to be on par with the yagis. I did a test with the yagis mounted 45 degrees (one each) and there wasn't too much of a difference between that, and having them mounted the original way. When I look at a 4G signal with my SDR, it's very clear that the signal is strongest when the antennas are oriented in a -/+ 45 degree orientation. I need to find some mounts that will allow me to amount these at +/- 45 degrees.

2. My roof mount mast is 10 feet tall, and I want to put my antennas as high as possible. One factor is all of this is weight at the end of the pole. The flat panels weigh 3lbs more total, than the yagis. I'm concerned that if I don't install some guy wire, I'll eventually damage this pole. This has me leaning towards the yagis for the final install, but the flat panels are so much more versatile (they have a much wider range of frequencies) it makes sense to use them even though they are not as fast.

3. Lastly, I'm going to try a band pass filter for one of the antennas, to see if this helps improve signal strength and SINR. Surprisingly, there is a lot of strong signals around here that are likely causing my modem to be overloaded with RF. I'm probably going to end up getting this one: https://www.minicircuits.com/WebStore/d ... NHP-600%2B to try on both antennas.

swwifty
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Re: DP727L15 - 15dBi 4G LTE Directional Antenna Review (Updated with comparisons)

Post by swwifty » Mon Oct 22, 2018 5:25 pm

oh also, thought I'd share a screenshot from my SDR software of a 10mhz wide LTE signal that is around 750mhz freqency.

For those of you who know more about LTE (or want to) you can clearly see the ODFMA signal (and it transmitting all the reference signals) and all the various little sub carriers. It's really fun to watch this in real time, and see your phone downloading data, etc. Uplink is even more fun to watch, cause its not a continuous stream of data like downlink is.
Screen Shot 2018-10-21 at 4.22.22 PM.png
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swwifty
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Re: DP727L15 - 15dBi 4G LTE Directional Antenna Review (Updated with comparisons)

Post by swwifty » Sun Nov 18, 2018 8:16 pm

Finally got this project 95% completed and running in a full time manner. I'll be posting a separate thread on this soon with lots of details on my final setup with pics, etc.

swwifty
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Re: DP727L15 - 15dBi 4G LTE Directional Antenna Review (Updated with comparisons)

Post by swwifty » Tue Nov 20, 2018 7:53 pm

Got a thread up on my final completed solution, you can read more about here: viewtopic.php?f=37&t=123

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