I have a PRD catalog which list the 219 as a Standing Wave Detector and
the 3302 as a Calibrated Susceptance. The 219 and 3302 cover 100-1000
Mhz. I'll scan pages that cover device and send to you. 73 Tom WB6IQD
In article , "Frank"
wrote:

Hello!
Does someone know the device shown in the picture :

http://www.webalice.it/bruno.santalucia/UNK.JPG

I am searching for a: manual / data sheet / user manual.
On the labels is reported : PRD Electronic Inc. Type 219 ser.no.1743 and
Type 3302 ser.no.156.
Any help is wellcome.
TNX de I6FCR