Beware of OpenWRT, as it will force your modem to auto band

Modem is configured to connect to the strongest signal during auto band

900Mhz is always stronger in term of signal but lower performance since it is only HSPA+ (NO DC)

Therfore, if you plan to use antenna, suggest stay with stock FW or go for V2 which is more stable router

well

our modem tend to connect to the strongest SNR and lowest frequency ( if support UMTS900 & UMTS2100 both ) in band config AUTO mode,..

with antenna we can change that facts, just need a clear correct aim in direction and connection will be super stable.

bear in mind, antenna is not for increase speed purpose,.. only for consistency purpose 

also not all cell tower broadcast high speed too,. some might be old tower with HSPA only 

thx  4 d info , how to force it to connect only 2100 ?

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Added on November 22, 2012, 12:01 pm
understood sir

There's a guide at my WIKI thread for referance

Launch MDMA and click band config and select 2100Mhz only

v2 flashed back from latest firmware to first firmware
now the signal always 0%, and the dns server still using maxis' even though i already changed to google's.

but it still works fine. can achieve >2Mbps and ping to KL maxis (with speedtest) less than 150ms

the max signal i can get previously is 22%.

Beware of OpenWRT, as it will force your modem to auto band

Modem is configured to connect to the strongest signal during auto band

900Mhz is always stronger in term of signal but lower performance since it is only HSPA+ (NO DC)

Therfore, if you plan to use antenna, suggest stay with stock FW or go for V2 which is more stable router

yeah it happen to me too, V2 firmware Bug,.. 

as long as it work, the 0% & DNS is fine 

i see.. thought i messed up my router 

gonna try tx 33 tonight on my e372

sometimes it will, but most of the time it wont even i reboot,.

i switch it off/on again...still the same.
reboot a few times (when removing wifi password and also when changing wifi BGN mode to G, then back to BGN)... still the same. 
...or maybe i should wait for a few days? 

if u really want to settle it, flash to openwrt, and set wireless G only with channel 11,

If I'm not wrong, my channel is at default Auto, which gives me a value 8.
I'll try to change that when I'm back home.

V2 is perfect in wireless N 300Mbps alone 

indeed

since no signal at where my pc is, have to go wireless
cant use lan cable, cos too far and messy.
MR3420v2 place near the window, WN881ND at my pc
300Mbps full blast (i think ) no disconnection so far

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Added on November 22, 2012, 5:35 pmtried E372 > MR3420v2 > LAN > old wireless router (150Mbps n) > wireless > PC before

result: not much difference with E372 > MR3420v2 > wireless > PC, so decided to use the more simple way.

after read above comment...
if my MF680 led colour is purple..meaning my connection is DC HSPA right...
thus, the modem are not connect to 900mhz right..
i still cant figure out what happen to my modem as i only can get 2.5mbps when using router

is any1 having this issue

yea V2 at wireless N 300Mbps , the ping is as low as the Lan cable too 

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Added on November 22, 2012, 6:00 pm

your case is very easy to trouble shoot,

just bring your Combination Setup to other area,

if u are still getting 2.5Mbps same speed, something is wrong with your device or your sim QoS 

bro,
i can confirm my sim not QOS
same area direct plug to USB easy hit 10mbps..
same place plug to router...become suck 2,5mbps max can get..
if use cable connect to router max speed 3.5mbps..
thus wireless card and wifi setting no effect....
thus is now on router setting + MF680 compatibility issue..
but strange i follow all exactly but still the same >_<

your zte mf680 on how many TX power ? original 23tx or ?

your router is V1 or V1.3 ? via lan cable or wifi G /N ?

stock firmware ? or opewrt ? 

TX - original 23 no modification

router V1 via wife G/N

openwrt

you should try to tweak your zte mf680 to -> 26/27tx or if you adventures enough like me can tweak to 33tx

then openwrt under wifi select G only

and also plug in your computer use MDMA to tweak your zte mf680 on UMTS2100/GSM900& 1800 band config

then try again