Please kindly help with placement of RBK50

[FURRYe38]

No. To some degree however your RBS should help maintain overall signal coverage. AT most you'll loose signal outside the home is all. 50% sill has good coverage at that setting.

[cellomaster]

My 5 GHZ speeds are 250-300 MB.

Yet, the 2.4 GHZ speeds in the part of the house furthest away from the router are only 15-20 MB.

I have set both powere transmissions to 50%.  Also, tried channels 1,6,11  Didn't make much difference between the channels.

What can I do to improve these low 2.4 GHZ speeds?

[FURRYe38]

2.4Ghz speeds will not be near what you get on 5Ghz. Also device design and support on 2.Ghz will be a factor as well. 1x1 and 2x2 antenna design will be a factor. 4x4 antenna designs have better speed support. 

[cellomaster]

My ping is rather high, it is in a 13-17 range.

Is there a way to decrease the ping?

[FURRYe38]

Is that a wired or wireless result? How are you testing pings? 

[cellomaster]

These are wireless results.

I use two diffrent Android apps.  Speedtest and NetSpot to measure ping.

[FURRYe38]

Pings are about normal. Can be anything between the speedtest site thru up to your wireless device. I recommend wired testing vs wireless. To many variables in wireless for accurate results.