I am trying to extend WiFi signal at camp site with a Linksys AC1900. Is this possible?

Your set may have a defective wi fi detection circuit that is causing all the grief. I had to return a laptop for this reason.
Maybe the signal is weak - try raising the router as high as possible off the floor and also try putting a deflector behind the router to direct the signals in the direction of tv set to maximize strength.

To bounce the WiFi signal you are receiving into and around your house, you will need a repeater or what is also known as a range extender/expander.

You will need to install an WIFI extender in the front room of your office which will then extend the signal to the rest of the out building. I've included a link on Amazon to a very simple, easy to set-up extender that you can set-up with the push of a button. Once you set-up/configured the extender near your existing router following the simple instructions, you can then move it to the front of your office. Best of luck!
Amazon com TP Link N300 Wi Fi Range Extender AP mode Supported TL WA855RE...

Wireless-g router can only extend it's wireless signal up to 50 to 75 feet. You can use a wireless signal extender to be able to extend the signal further. And yes, you may have password on the wireless network.

The possible cause is the router is not able to extend the signal to that range. Try using a range extender to boost your wireless signal. Signal strength depends on the router. So adding a range extender should solve this issue

YOu can add a wireless extender to your network and position the extender near the blu-ray.
Look at these models. I personally like the Linksys model. Http://Amazon.com/extender

There are a few things you can try to extend your wifi signal.
If the antenna of the router is removable, then you might want to look at antennas with a higher gain, keep in mind they must have the same type of connector as your router. If your antenna is not removable, or this doesn't get you the range you need, then you may want to look into a wireless repeater, this you need to just place at the edge of where your wifi connection drops off, and it will extend the signal by rebroadcasting it.

Cheers!

As a wi-fi technician, it is not recommended to extend the wireless signal using another wireless router. Having 2 wireless routers will just cause conflict to your wireless network. If you still have time, please replace the router with a Wireless Access Point (WAP54G). WAP is easy to setup. Just plug it to one of the ethernet port on the back of your router and run the setup CD that came with it, that's it. It'll extend your signal.

If your main concern is just extending your wireless signal to another far place outside your house, Wireless Range Expander (WRE54G) can also be used. It is a similar device like an Access Point but its signal extending capability is more powerful than Access Point. Its also easy to setup, just the setup CD that came with it.

You can also contact the Linksys toll free tech support # at 1800-3267114 if you wanna resolve the issue over the phone. Hope that helps.

-Regards

Yes of course you are correct, you need a range extender, which will boost up your signal strengeth..you can purchace one according to your router standards, you can go for linksys range extenders..but select the proper one which works perfect with your router..