EME154 1.2GHz FM Video Tx Kit
The EME154 is a high performance FM Television transmitter Kit for use on the 1.2GHz ( 23cm Band ). The transmitter can also be multiplied up in frequency to cover the higher microwave bands using the Mini-Kits Multiplier Kits. The design has an onboard Video Amplifier and Pre-emphasis, and uses an ERA MMIC as a buffer amplifier to give up to +13dBm output. An optional Phase Locked Loop Kit and Audio Sub carrier Kits are also available to built a complete FM ATV transmitter. The Kit is easy to construct and align, and a surplus FM Analogue Satellite receiver can be used for viewing the signal.
The construction is quite straight forward and many of the components are easily fitted with tweezers. The Kit construction notes and overlay diagrams should be carefully followed when constructing. For larger pictures to check orientation of some components click the images below. Remember to fit the wire link to the deviation trimpot under the board. BUY THIS PRODUCT
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 trim pot 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 in line with the video input on the EME154 board. Look for a resistor attenuator calculator on the internet for the resistor values required for a suitable 75ohm attenuator.
1/ There is a fault with the EME154-Rev2 PC boards. A wire link is needed on the 20kohm Trim-pot between the wiper and the pad that goes to pin 2 of IC1. The fault is that the video deviation cannot be adjusted.