IMac losing signal of the network

Hi,
I have a wireless conection as my only way to access the internet, the wireless router is near the iMac and the signal is really clear.
Many times a day my Mac stops comunicating with the router and I need to close the internet using app and then reopen it to gain access again to the internet.
When that happens my iMac is always encountering new wireless networks, so i think my iMac gets confused and is trying to access the other networks, so the apps forget how to access the net.
is there a way to tell my mac to only search for my network and not for anyones network?
should i change the channel of the signal (1 to 11 i think)?
change the encryptation to dav, wep or something else?
get into the terminal?
I have access to my gateway config page. its a 2Wire 2701HG-T Gateway
thanks from Mexico
the problem does not occur with my G3 iBook

Based on that Time Machine storage reference, is this iMac possibly running Mac OS X Server? If this is Mac OS X Server, does this server have static IP address, and valid DNS services?
Are all the IP addresses in the same IP subnet? Are you using one of the private IP address subnets?
Are there any wired network connections in use, in addition to wireless?
Are you located in an area where there may be many wireless IP networks installed?

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What app can you download that will allow wifi calling when you have no cell signal through the network?

You might Give this App a Try.. I have not use this my-self but have Look through the Link see what you think..
Talkatone free calls + texting - Android Apps on Google Play
Here's some Extra Info I found through C|Net on the app you were asking about
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I have my iMac always on, serving up our big ITunes library to our wireless network around the house. It seems to fall off the network fairly regularly, every few days or so. I have the newer Airport extreme and several Airport expresses (not the latest ones) connected to stereos in different rooms of the houses.
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The following Knowledge Base article should provide assistance in troubleshooting your issue:
Wi-Fi: How to troubleshoot Wi-Fi connectivity
http://support.apple.com/kb/HT4628
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My fix for the AE dropping off the network in client mode

Turn off any encryption.
I have the linksys/vonage/wireless G router, which supports WPA. The AE will sometimes join the network with WPA but it takes anywhere from 1-5 minutes for it to do so. When finally on the network it shows up on the Airport manager list and in iTunes. The most playtime I could get out of it was 15 mins, before it would drop from the network. The light on the AE would be solid green, but I couldn't ping it. The only solution was to power cycle the AE. Note this is dropping w/out running the microwave, cordless phone, verifying my network channel is different from my neighbors, etc.
I tried fiddling with WEP but the only way I could get that working was to specify the full key in hex, appearantly Apple and Linksys don't agree on the way to take a passphrase and turn it into a key.
So I dropped to the unencrypted network, disabled the SSID broadcast and restricted wireless access to my machines. Works great now. :/ If I run the microwave and the cordless phone at the same time I can get Airtunes to drop, but it comes right back when the microwaving is done.
Very frustrating, and the part that is the most irritatating is that my mac laptop and iMac can get on the network just fine.
Still deciding if I want to keep it this way or say nevermind and return the AE.

I found the solution after many many many attemps.
It's not a MBP problem, it's your wireless router.
1- Set your BEACON between 20 and 50. D-LINK router for example use 100 has default value. It's too long.
2- Change your channel. D-link default is 6. Use whatever channel. I use 10.
Hope you enjoy!

IMac losing signal of the network

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