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MaximumSignal
EVDO Vendor
Joined: 08 Apr 2005
Posts: 586
Location: Cheektowaga, NY
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 Posted: Wed Apr 12, 2006 10:46 pm Post subject: |
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Just to reply to a few of your points
1) we use ultra low loss cable in all our adapters and antennas. and refer customers to WWW.Eur-am.com for thier long cable runs as he has high Quality low loss cable available
2) Our amplifier compensates for any RF loss in cabling and connections as the Effective Radiated Power is measured at the device and not the antenna as most other products on the market do
3) no one ever claimed a 10 db antenna is 1000% times more powerful . power doubles with every 3 db as I am sure you know
4) as I commented , he was the first customer to ever report that problem of the units interferring with hi 900 mhz phone. I have still not have a report of that nature . I actually went to our Engineers with the problem and they said it was possible and that the antenna from the amplifier should be placed further away, in fact outside. The die cast cases or amplifiers come in have zero RF leakage. We take great pride in the quality of our cases . Only Wilson has a similar die cast case
5) I am by no means a worldy expert on RF and am always learning . I count on the numerous engineers employed by Inteligain , * , Motorola and Alltel for my information
thanks for input |
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jstjohnz
EVDO Fledgling
Joined: 04 Apr 2006
Posts: 25
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| Posted: Thu Apr 13, 2006 6:01 am Post subject: |
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| MaximumSignal wrote: | Just to reply to a few of your points
1) we use ultra low loss cable in all our adapters and antennas. and refer customers to WWW.Eur-am.com for thier long cable runs as he has high Quality low loss cable available
2) Our amplifier compensates for any RF loss in cabling and connections as the Effective Radiated Power is measured at the device and not the antenna as most other products on the market do
3) no one ever claimed a 10 db antenna is 1000% times more powerful . power doubles with every 3 db as I am sure you know
4) as I commented , he was the first customer to ever report that problem of the units interferring with hi 900 mhz phone. I have still not have a report of that nature . I actually went to our Engineers with the problem and they said it was possible and that the antenna from the amplifier should be placed further away, in fact outside. The die cast cases or amplifiers come in have zero RF leakage. We take great pride in the quality of our cases . Only Wilson has a similar die cast case
5) I am by no means a worldy expert on RF and am always learning . I count on the numerous engineers employed by Inteligain , * , Motorola and Alltel for my information
thanks for input |
1) I don't think RG/174 can ever be described as 'ultra low loss'. The best loss spec that I can find for RG/174 is about 60db per 100 feet at 1900 mhz and 40db/100ft for RG174ULTRA, or about 35db/100 ft for the Times Microwave LMR-100 which appears to be the highest-quality size-equivalent to the RG/174.
I use RG/174 as an example since the only antenna I found on your site that had a description of the included cable indicated 10 feet of RG/174. I assume the adapters are made of the same cable, but if this is not correct please let me know.
2) "Our amplifier compensates for any RF loss in cabling and connections as the Effective Radiated Power is measured at the device and not the antenna as most other products on the market do"
I'm not sure that I understand this statement at all. The calculation of effective radiated power ALWAYS includes the antenna gain, since without an antenna nothing is radiated! Effective radiated power (ERP) = transmitter power output+amplifier gain-cable losses+antenna gain.
Also, ERP is a measurement of power, not gain. It is expressed in watts, or dbm/dbW.
3) no one ever claimed a 10 db antenna is 1000% times more powerful . power doubles with every 3 db as I am sure you know
I didn't pick the numbers at random. Yes 3db is a doubling of the power, and 10db is equivalent to 10 times the power = 1000%.
The point though was not the math, but to illustrate that to claim gain, without providing a reference, can be misleading.
Now to a certain extent you are at the mercy of your suppliers as you can only pass along the information they give you. But in the interest of accuracy, since you obviously have a good working relationship with the engineers, I would encourage you to pin them down as to the reference point for their claimed antenna gain figures.
Wilson seems to be a culprit in the numbers game for both antennas and cable. On their web site they list loss figures for the various lengths of coax cable they sell, but they fail to mention the frequency that these loss numbers correspond to. By looking at the charts it's apparent that they are referring to loss at 800mhz, but these numbers could be very misleading to someone planning a 1900mhz antenna system.
No quibbles here with 4 and 5. Thanks for not taking offense at my post.
I am new to EVDO and came straight to these forums to educate myself before jumping in. I have learned a lot here, and from your posts especially. I have Sprint service and use a S620 card (Novatel?) either directly in my laptop or with a KR1 router.
Primarily in the laptop so far as it allows me to check signal strength. Here in the Indianapolis area coverage appears to be quite good although variable which I guess is just a characteristic of the beast, and so far I could not be more pleased with the service.
-jim- |
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jhettinger
EVDO Newbie
Joined: 20 Apr 2006
Posts: 1
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| Posted: Mon Apr 24, 2006 12:52 pm Post subject: Digital Antenna SBR with EVDO |
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Hi, new to this forum and not really a tech guy. I have a sailboat with a 9DB antenna at the top of the mast, a Digital Antenna DA4000-SBR. It does well in low signal locations, but when I use my Verizon PC5220 card and their software, it will not show the EVDO signal. In the instructions, it says that the Digital Antenna boosts signal, but the bars for signal strength on a phone will not show the actual signal. I assume this is the same for the aircard, and that is why it is not locking onto a good EVDO signal, going only for the 1xRTT signal.
Any way to overcome this, like forcing it to try EVDO only?
Thanks for any ideas!
Jim
_________________
JEH |
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MaximumSignal
EVDO Vendor
Joined: 08 Apr 2005
Posts: 586
Location: Cheektowaga, NY
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| Posted: Mon Apr 24, 2006 12:55 pm Post subject: Re: Digital Antenna SBR with EVDO |
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| jhettinger wrote: | Hi, new to this forum and not really a tech guy. I have a sailboat with a 9DB antenna at the top of the mast, a Digital Antenna DA4000-SBR. It does well in low signal locations, but when I use my Verizon PC5220 card and their software, it will not show the EVDO signal. In the instructions, it says that the Digital Antenna boosts signal, but the bars for signal strength on a phone will not show the actual signal. I assume this is the same for the aircard, and that is why it is not locking onto a good EVDO signal, going only for the 1xRTT signal.
Any way to overcome this, like forcing it to try EVDO only?
Thanks for any ideas!
Jim |
A direct connection works best for EVDO due to the difference in EVDO and Cellular transmissions. There was a gentleman here before that connected his repeater directly to his card. I would never reccomend it . But it is something you might want to try at your own risk |
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Indio192
EVDO Fledgling
Joined: 03 Jun 2006
Posts: 19
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| Posted: Sat Jun 10, 2006 9:54 am Post subject: |
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Just got my CA-819 from MaximumSignal. Here are the RSSI results from the Verizon Connection Manager Engineering Menu.
PC5220 with no external antenna: 76
PC5220 connected to Wilson Trucker antenna on motorhome roof: 59
PC5220 + Wilson + CA-819: 41
All I can say is WOW!
This is an EVDO connection (I'm presently at the Wisconsin State Fairgrounds in Milwaukee).
Big thanks to Gordon at MaxSig.
Jim |
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jstjohnz
EVDO Fledgling
Joined: 04 Apr 2006
Posts: 25
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| Posted: Sat Jun 10, 2006 2:08 pm Post subject: |
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| Indio192 wrote: | Just got my CA-819 from MaximumSignal. Here are the RSSI results from the Verizon Connection Manager Engineering Menu.
PC5220 with no external antenna: 76
PC5220 connected to Wilson Trucker antenna on motorhome roof: 59
PC5220 + Wilson + CA-819: 41
All I can say is WOW!
This is an EVDO connection (I'm presently at the Wisconsin State Fairgrounds in Milwaukee).
Big thanks to Gordon at MaxSig.
Jim |
I would be interested to know if you see any difference in connection speeds using the external antenna, but with and without the amplifier. I think this would be a better performance indicator than RSSI. You might need to move a bit farther out to do the test though, even the -76dbm is a strong signal.
-jim- |
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