The AD8307 is the first logarithmic amplifier made available in an 8-lead SOIC_N package. It is a complete 500 MHz monolithic demodulating logarithmic...
Datasheet AD8307 on Analog.com
Assuming the transmit power is within the dynamic range of the AD8307, yes it should be able to measure the Tx ASK power. Response will probably have an intercept shift of the transfer function due to the frequency and non-CW signal.
This question has been assumed as answered either offline via email or with a multi-part answer. This question has now been closed out. If you have an inquiry related to this topic please post a new question in the applicable product forum.