Drake Home Page Drake Technical Tips Menu
TR-7 PIN DIODE TEST PROCEDURE
Disconnect PS-7 pr power supply from TR-7.
Remove TR-7 wrap-a-round cover.
Re-connect PS-7 or power supply
Locate on TR-7 and select the 10 meter band, receive mode. The anode of CR-1501 should measure zero volts or no more that 300 millivolts. The anode of CR-1503 should measure +10 to +11 volts DC.
Connect dummy load to TR-7
Select CW mode and advance the gain control to full output. Key the TR-7, the anode of CR-1501 should measure +1- to +11 volts DC. The anode of CR-1503 should measure zero to no more the 800 millivolts.
Replace diodes accordingly to achieve proper results.