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MaximumSignal
EVDO Vendor
Joined: 08 Apr 2005
Posts: 586
Location: Cheektowaga, NY
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 Posted: Mon Jan 15, 2007 4:49 pm Post subject: |
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| DHESS wrote: | | Like I said I have not had anyone reply that the omni has worked for the u720. Everyone who has responded about the u720 has said it has not worked with the omni.I have asked before if anyone(who does not run this site) has used the omni with the u720 and had good results PLEASE POST. I would not by an omni for the u720 until this is resolved. |
There is no reason an antenna will work for one type of device and not another unless there is a problem with the actual RF port on the device |
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kd5xb
EVDO Fledgling
Joined: 12 Jan 2007
Posts: 20
Location: Clovis, NM USA
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| Posted: Mon Jan 15, 2007 4:56 pm Post subject: |
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| MaximumSignal wrote: | | There is no reason an antenna will work for one type of device and not another unless there is a problem with the actual RF port on the device |
I'm not sure I agree with this one. My opinion is that the Wilson antenna works great on 868-902 MHz but not very well at all on 1.9 GHz. This would get good signal strength on the slower data band but poor results on EVDO.
My opinion, and probably worth just what you paid for it...
Earl |
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MaximumSignal
EVDO Vendor
Joined: 08 Apr 2005
Posts: 586
Location: Cheektowaga, NY
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| Posted: Mon Jan 15, 2007 5:17 pm Post subject: |
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| kd5xb wrote: | | MaximumSignal wrote: | | There is no reason an antenna will work for one type of device and not another unless there is a problem with the actual RF port on the device |
I'm not sure I agree with this one. My opinion is that the Wilson antenna works great on 868-902 MHz but not very well at all on 1.9 GHz. This would get good signal strength on the slower data band but poor results on EVDO.
My opinion, and probably worth just what you paid for it...
Earl |
He paid alot for it , I would contact Wilson directly and ask them if there is an issue with thier antenna on 1900. |
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DHESS
EVDO User
Joined: 08 Jan 2007
Posts: 42
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| Posted: Mon Jan 15, 2007 6:06 pm Post subject: |
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| I do not know much about antennas but if the omni is a dual band, is the booster a single band????? |
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n6gn
EVDO Junkie
Joined: 22 Aug 2006
Posts: 364
Location: Northern California
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| Posted: Mon Jan 15, 2007 6:10 pm Post subject: |
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| kd5xb wrote: | | MaximumSignal wrote: | | There is no reason an antenna will work for one type of device and not another unless there is a problem with the actual RF port on the device |
I'm not sure I agree with this one. My opinion is that the Wilson antenna works great on 868-902 MHz but not very well at all on 1.9 GHz. This would get good signal strength on the slower data band but poor results on EVDO.
My opinion, and probably worth just what you paid for it...
Earl |
I think your opinion may have some pretty reasonable foundations behind it. For one thing, everything else equal (which of course it never quite is), there willl be 7 dB more space loss between 1.9 and .85 GHz. If there is 20 feet of rg58u cable on the antenna (how much cable does Wilson put on it? The web site doesn't seem to say), there's probably at least another 4 dB of attenuation between the two bands. That's at least 11 dB of degradation for PCS relative to 850 MHz. If on top of that, there is significant foliage or obstructive attenuation, which is almost certain otherwise there would be plenty of signal strength out to several hundred miles, then the difference can be considerably greater.
However, of all these factors, relative to the internal antenna performance, the only one that should make things relatively worse is the cable loss. RG58 is pretty bad stuff at 1.9 GHz.
n6gn |
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MaximumSignal
EVDO Vendor
Joined: 08 Apr 2005
Posts: 586
Location: Cheektowaga, NY
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| Posted: Mon Jan 15, 2007 6:15 pm Post subject: |
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| DHESS wrote: | | I do not know much about antennas but if the omni is a dual band, is the booster a single band????? |
The booster-antenna is dual band as well |
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kd5xb
EVDO Fledgling
Joined: 12 Jan 2007
Posts: 20
Location: Clovis, NM USA
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| Posted: Mon Jan 15, 2007 6:19 pm Post subject: |
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| n6gn wrote: | | RG58 is pretty bad stuff at 1.9 GHz.n6gn |
Yeah, but it's kinda difficult to get Heliax into the cab from the mirrors!
9913 might be easier... 
Earl |
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n6gn
EVDO Junkie
Joined: 22 Aug 2006
Posts: 364
Location: Northern California
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| Posted: Mon Jan 15, 2007 9:43 pm Post subject: |
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| kd5xb wrote: | | n6gn wrote: | | RG58 is pretty bad stuff at 1.9 GHz.n6gn |
Yeah, but it's kinda difficult to get Heliax into the cab from the mirrors!
9913 might be easier...
Earl |
Actually, Times-Wire LMR family is close to Heliax, and a lot better than 9913 and costs the same. LMR400 is just as easy as 9913,about $0.50/foot and at or under 6 dB/100' at 1.9 GHz. That's why I quit using 9913 several years ago.
LMR200, which is about the same size as RG58, though I admit a lot stiffer, is lossier than LMR400 but a fraction of the attenuation of RG cables of the similar diameter..
50' or less of RG58 can probably do more damage than most antennas can undo even given their improved location and gain.
n6gn |
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DHESS
EVDO User
Joined: 08 Jan 2007
Posts: 42
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| Posted: Tue Jan 16, 2007 1:37 pm Post subject: |
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| Well I sent the omni back today.It looks like i will get a full refund(less shipping and handling).I will post when i get the refund. If anyone is using a yagi and the u720 PLEASE POST!!!!! I would like to see if the yagi antennas work with the u720.As of now there has not been one response that the omni works with the u720. Any info on the yagi would be appreciated!!!!! |
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DHESS
EVDO User
Joined: 08 Jan 2007
Posts: 42
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| Posted: Tue Jan 23, 2007 9:35 pm Post subject: |
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| I am happy to say booster antenna stands behind their product. I got a FULL refund today for my omni antenna!!!!!!!! Thank you very much!!!!!!! |
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Michael
Site Admin
Joined: 13 Jan 2005
Posts: 5067
Location: Cary, IL
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| Posted: Tue Jan 23, 2007 9:59 pm Post subject: |
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Well of course we do! But thanks for your post anyways.
FYI, did a quick search, we have sold 650+ omni antennas and have refunded 6 people (your # 6).
They really do work, BUT in case a product we sell doesn't, contact our tech department, they really can help (like in your case, we sent out a second antenna for you to test).
(sorry for the duplicate post, but apparently, this topic was posted to 3 threads - hint, no need to duplicate post).
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glenozzy
EVDO User
Joined: 03 Jan 2007
Posts: 49
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| Posted: Wed Jan 24, 2007 8:47 am Post subject: |
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Gents
EVDO RSSI is not a good indicator of signal quality because all of the sites transmit on the same frequencies. In order to have a quality connection you must have a dominate PN and a low frame error rate (FER) broad band Omni antennas are not good for this application. The only time an Omni antenna should be used is when the receiver has to be on the move. |
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Scott
EVDO Junkie
Joined: 18 Jul 2005
Posts: 530
Location: Central Coast of California
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| Posted: Wed Jan 24, 2007 12:00 pm Post subject: |
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As I have written elsewhere on these forums, comparisons between commercially available omni and directional (yagi) antennas have returned the same results, time after time: based on data rate and latency, the omni antennas worked just as well in most applications. This wasn't just back-to-back tests, but over months of use.
While we have always agreed that directional antennas may provide better throughput, lower latency, and lower FER, they do not do so in the majority of the static installations we have encountered. If they did we would sell them. Seriously. We're in this business because WE use this stuff TOO.
We all actually USE the omni antennas we sell. I do have directional antennas in a couple of personal setups, but I have a stack of directional antennas piled here in my walk-in and I'm more prone to grab our Omni External for radio tests than any of the others. Call me lazy, but it is the one that most often works best. |
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MaximumSignal
EVDO Vendor
Joined: 08 Apr 2005
Posts: 586
Location: Cheektowaga, NY
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| Posted: Wed Jan 24, 2007 12:05 pm Post subject: |
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| Scott wrote: | As I have written elsewhere on these forums, comparisons between commercially available omni and directional (yagi) antennas have returned the same results, time after time: based on data rate and latency, the omni antennas worked just as well in most applications. This wasn't just back-to-back tests, but over months of use.
While we have always agreed that directional antennas may provide better throughput, lower latency, and lower FER, they do not do so in the majority of the static installations we have encountered. If they did we would sell them. Seriously. We're in this business because WE use this stuff TOO.
We all actually USE the omni antennas we sell. I do have directional antennas in a couple of personal setups, but I have a stack of directional antennas piled here in my walk-in and I'm more prone to grab our Omni External for radio tests than the any of the others. Call me lazy, but it is the one that most often works best. |
I agree with Scott on this one ,an omni unless in extreme conditions is the best choice. A yagi takes great time and patience to aim to get the desired results . An omni if mounted properly can produce pretty well as good as result without the extra effort . And with an omni you can get signal from Multiple towers in case one of the towers has issues. |
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glenozzy
EVDO User
Joined: 03 Jan 2007
Posts: 49
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| Posted: Wed Jan 24, 2007 12:47 pm Post subject: |
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| Quote: | | And with an omni you can get signal from Multiple towers. |
In CDMA EVDO signal from Multiple towers IS A BAD THING.
if you are in soft handoff you can not achieve FULL RATE.
your next question is why?
Soft handoff means that you are on more than 1 tower at a time
in a voice call this is not a big deal because of the amount of data is small and is not stored in memory of the sites
On a data call the data is shipped to your best serving site and held while downloading.
If your in Soft handoff it slows down the process, and the SARA algorithm will not assign you a full rate session until
You have a dominate PN.
Glen |
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