Description
High gain 8W with low voltage 15V LDMOS
The 8W pallet has been designed for applications requiring low supply voltage (15V) and very high gain. It can produce full output power from just a few milliwatts of drive power.
Each pallet amplifier we sell is designed and tested using vector network analyser and spectrum analyser. Our amplifier products are manufactured using an automatic surface mount assembly process. This pallet is optimised for 12-15V operation and is perfect for battery-powered mobile applications and solar powered applications. Using a lower voltage will result in lower output power. It is well suited as a driver stage and it will operate down to about 10 volts with reduced output. RF output power can be adjusted by lowering the supply voltage or attaching a 1K trimmer or potentiometer to two provided pads. As with any pallet you will need a heat-sink, power supply and filter to use it. More information is available in the included amplifier data sheet.
Due to high gain the 8W pallets can be powered practically from the DAB+ DDS, an isolation stage and shielding are recommended for stability. Practically any source you can imagine will be strong enough to drive this pallet amplifier.
Technical specifications:
– DAB+ band, 175MHz to 225MHz
– Input/output 50 ohms.
– Pout max: >25W @200MHz (CW)
– Pout max: >8W @200MHz (DAB+)
– Pout max: >15-18W @band edges (CW)
– Drive power required: ~1mW (monitor output to avoid overdriving)
– Requires 15Vdc: ~3,5A max at 25W CW (DO NOT EXCEED 16V)
– No bias adjustments or RF circuit tuning is required.
– Size V3 8W: 48x57mm, 20mm high
Suitable mains power supply are here.
Warning: Do not exceed maximum supply voltage of 15V or damage will occur to the on-board operational amplifier.
Note 1: Please use PTFE coaxial cable for RF input (RG178 is perfect) and output (RG178 or RG142 are perfect) connections, this makes it possible to have very short leads without burning the coax. Keep the coax leads as short as possible (few mm at most). Also keep leads short on connectors, this N female flange for RG142 or .141 semirigid – easy install is perfect!
Note 2: A small heatsink is definitely needed!
Note 3: There are signs of soldering on each board. This is due to testing (during testing coaxial cable is attached). Also a coil and a capacitor are exchanged (same pallet is used for 25W FM band).
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