If you need to make a scalar network analyzer measurement of your device you can doing it at low cost using hardware you already have. To make a gain measurement and return loss measurement of any device, you can use a scalar network analyzer such as the discontinued Agilent 8757D or you can use power meters and power sensors, along with a signal generator and some other hardware on your bench to make the same measurement. You probubly already have all of this equipment laying about the lab.
To do: this review the Applicartion Note "Scalar Network Analysis with U2000 Series USB Power Sensors" which you can find at:
http://cp.literature.agilent.com/litweb/pdf/5990-7540EN.pdf
This note shows you how to put together a system to make these measurements. There is also free sofware available to make these measurements at: http://www.agilent.com/find/SNAsoftware_download
To do: this review the Applicartion Note "Scalar Network Analysis with U2000 Series USB Power Sensors" which you can find at:
http://cp.literature.agilent.com/litweb/pdf/5990-7540EN.pdf
This note shows you how to put together a system to make these measurements. There is also free sofware available to make these measurements at: http://www.agilent.com/find/SNAsoftware_download