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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
 

Bubblesthefish6

ULTIMATE Member

Gandi69

Pro Member
Stick to a decent brand antenna, the stuff sold for sub £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
 

Lucian

ULTIMATE Member
Stick to a decent brand antenna, the stuff sold for sub £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?
 

Gandi69

Pro Member
I’m getting the bluespot “large” antenna I suppose you’d call it, they do a mini one too.
If it’s easy to open I don’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.
 

Lucian

ULTIMATE Member
Hm, for some reason I can't seem able to find a gain or swr graph for these bluespot antennas.
 

Cronus

Casual Member
You are probably best off with a Poynting antenna. The XPOL-A001 4G seems good.
Here's a link 👉 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 what’s needed. The description says it also covers wifi bands too, that’s an unexpected bonus. Just got to check the antenna connections match, then I’ll get one ordered. There are some very cheap antennas on Amazon, but I’ll bow to your experience and go for the expensive/quality one. I‘d rather avoid problems than create them :)
 

Cronus

Casual Member
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 :)
 

Gandi69

Pro Member
great video here with in depth analysis and tear down of one of those cheap antennas you see plastered all over eBay and Amazon.

 

Lucian

ULTIMATE Member
@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.
 

Mr Choo

Regular Member

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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