A dummy load consists of a non-inductive resistor having a dissipation equal to the expected output power. Such a dummy load would have a resistance of about 50 or 70 and may consist of a parallel or series/parallel connection of carbon resistors; for example, ten 5W 680
resistors may be connected in parallel to provide a 50W 68
load which would be
satisfactory for a 75W input transmitter. The dissipation of the load may be
increased by immersing it in oil. A dummy load should be screened.
On
the left, a home made dummy load (screening cover removed). The load consists of 20 x 1k
3W resistors in parallel. The LED near the input connector lights in the
presence of over 0.5W of RF. The load is useable up to about 500MHz. To the
right is a commercial unit.
![]() Back |
![]() Index |
![]() Next |
page (c10-1-6) |
Click here for important Copyright information |
Web Space provided by Hostroute.com Ltd |
email the Project Co-ordinator |