As always, sorry if this is covered:

What are the default initial Response, Signal and Firewall ratings for a given drone?

I assume the Firewall is equal to the rating of the pilot program (like an agent), but it would be nice to see in print someplace...and what about Response and Signal?

3 I believe.

Rules are givejn for improvong all the ratings except sensor (grrr)

Take a look at the table in the Matrix chapter with the ratings for normal devices, and consider that the difference between a drone and a vehicle isn't very big, ruleswise.

So, 3 for a civvie one, 4 for a security one, and 5 for a military one.

Yeah, I can improvise a workable rating, I was hoping that a cannonical set of ratings was in a table somewhere that I'd just missed.

I was just discussing this with a friend of mine because I was thinking of playing a rigger. There's no way to guess the canon upgrade pricing since all of the drones with different sensors are fundamentally dissimilar. However, I came up with a formula for Sensor upgrade pricing that I think is fair:

Upgrade cost = Base Cost of Drone * 0.75^(7 - Desired Rating)

This formula is meant for a system where 6 is the highest possible Sensor rating. If you'd like to go with a different max, change the number 7 (in the exponent calculation) to Your Max Rating + 1.

You could also use this as a conversion table, just to cut out some of the math...
R1 = 0.178
R2 = 0.237
R3 = 0.316
R4 = 0.422
R5 = 0.563
R6 = 0.75



Example: The Lone Star iRoll has Sensor 2 and costs 1500. Using this formula, the Sensor pricing for this drone would be:
R3 Sensor - 474
R4 Sensor - 633
R5 Sensor - 845
R6 Sensor - 1125