The document appears to be a radio frequency guide that contains a chart listing wavelengths and frequencies along the x-axis from 0.3mm to 100mm. The y-axis lists corresponding frequencies from 0.4GHz to 320GHz. The document also mentions several companies including Cambium, Repeatit, Ruckus Wireless, Ceragon, Purdicom, Siklu, and Fastback Networks. It provides contact information for Purdicom.

1. 300
200
100
80
60
40
20
10
6
4
2
0.8
0.6
0.4
0.3
8
1.0
2 4 6 8 10 20 40 60 80 100
Wavelengthλinmm
Frequency ƒ in GHz
32
Cambium, Repeatit &
Ruckus Wireless
Ceragon
Purdicom
Not used
Siklu & Fastback Networks
Key:
Radio Frequency Guide
t: 0333 1212 100 w: www.purdi.com e: hello@purdi.com