Orbitting problem

[NewKSPPlyer]

I tried to orbit kerbin however at about 50-55km, the probe loses connection and i cant throttle and the manuever nodes i placed wont burn.
I am using the Zsat vehicle in the stock ingame version and i dont know staging mechanic yet so checking staging wont be a option, can anyone help?

[Scarecrow71]

Do you have an antenna on the probe, and if so, is it deployed?

[Vanamonde]

Loses connection? That shouldn't happen at that range. Is it possibly running out of electricity, or going so fast that heat (plasma) is blocking radio? 

[Regor]

I am almost certain that what is happening is that the body of Kerbin is blocking your probe from connecting to a location on the ground. This has happened to me often, especially if the occlusion modifiers in the difficulty settings of the save don't allow for much leeway. My workaround to this was to take a much steeper but less efficient ascent that reaches a higher altitude (100km is good). This allows your probe to view more of Kerbin's surface at once while remaining relatively close horizontally to the KSC - though your mileage may vary.