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D-Link DWR-921- 2 questions

Cronus

Casual Member
Got a D-Link DWR-921 4G modem/router which is used for remote monitoring cctv cameras. It has 2 removable antennas. Can anyone recommend an external antenna for this device in order to improve the mobile network connectivity?

Also, anyone know if its possible to have too many wi-fi cameras on a 4g router? Currently have 8 cams but they lose connection randomly. I suspect the router may be throwing them off the network, after restarting the D-Link router they all on again until randomly losing connection again. There appears to be no way to improve wi-fi on this device because the antennas are built in, only the 4G antennas are external.

Thanks
 
Stick to a decent brand antenna, the stuff sold for sub Ā£20 on ebay is generally garbage. Poynting, Panorama etc. Im about to try a Bluespot antenna next week, they seem to be good quality if a relative newcomer
 
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Stick to a decent brand antenna, the stuff sold for sub Ā£20 on ebay is generally garbage. Poynting, Panorama etc. Im about to try a Bluespot antenna next week, they seem to be good quality if a relative newcomer
Could you, if possible, open the antenna up and share with us some pictures?

Which model are you getting?
 
Iā€™m getting the bluespot ā€œlargeā€ antenna I suppose youā€™d call it, they do a mini one too.
If itā€™s easy to open I donā€™t mind doing that, there is a video on the bluespot YouTube channel where you briefly see inside it and it looks well made - nothing like those Chinese things where its all solder splatter and bits of brass foil.
 
Hm, for some reason I can't seem able to find a gain or swr graph for these bluespot antennas.
 
You are probably best off with a Poynting antenna. The XPOL-A001 4G seems good.
Here's a link šŸ‘‰ https://www.amazon.co.uk/dp/B00C1DGFPS/ref=cm_sw_r_cp_apa_glt_fabc_BXKSK6KC05SSQKKZFTEY
Thanks for the recommendation and the link. This looks like exactly whatā€™s needed. The description says it also covers wifi bands too, thatā€™s an unexpected bonus. Just got to check the antenna connections match, then Iā€™ll get one ordered. There are some very cheap antennas on Amazon, but Iā€™ll bow to your experience and go for the expensive/quality one. Iā€˜d rather avoid problems than create them :)
 
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Just wanted to thank everyone else who replied. Once the antenna is sorted I can look into the 2nd problem of why the cams are randomly being disconnected from the network. Thanks again :)
 
great video here with in depth analysis and tear down of one of those cheap antennas you see plastered all over eBay and Amazon.

 
@Gandi69 I'm a subscriber of that channel, wish he did more clips on cellular rather than wifi, though.
He is spot on about the cheap ebay antennas with silly numbers of gain.
 

Cronus​

Regarding your wi-fi cameras being dropped.
I had two of these routers in the past, bought from a medical supply company on ebay as my first venture into the getting decent broadband when BT are useless. One unused (a spare I expect) and one used. They did not work (too slow at both locations) to my expectations so they went back on eBay and I got a beer or two out of them. Replaced with a 525 at the time.
However the wi-fi signal was strong and could reach the extremities of my garden at one house with the signal at 20% power and be useable outside.
Therefore I wonder if the strong wi-fi signal may have something to do with your issue and dropping the power output down from 100% by a few steps is worth experimenting with. Think it drops in 10 or 20% steps but may be wrong there, it was while back.
I know there are few variations of the 921, mine were the B if I remember correctly.
 
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