KIT FAULTS
& MODIFICATIONS
1/ A number of early Kits
had the polarity of one of the 100uF electrolytic capacitors incorrectly
marked on the overlay diagram. Make sure that the -Ve connection
of the 100uF is connected to pin 3 TL592 Ground with a multimenter
2/ Kit change 12/4/07 was to replace the
22uF capacitor on the input side of the TL592 for a 100uF to improve
the low frequency video response.
3/ Kit change 12/4/07 was to delete the 0.1uF
capacitor that was connected from the centre wiper of the 100kohm
trimpot to ground. This greatly improves the high frequency video
response.
4/ When using the EME154 with multipliers
on the higher microwave bands, the Video deviation will need to
be reduced. For use with the 3GHz EME101 Multiplier Kit, a 10dB
75ohm resistor attenuator needs to be fitted inline with the video
input on the EME154 board. Look for a resistor attenuator calculator
on the internet for the resistor values required.
Thursday 5th June 08 