LPFMAX 2K+ 2KW FM LOW PASS FILTER with DIGIAMP

Description

LPFMAX 2K+ 2KW FM LOW PASS FILTER with DIGIAMP

Based on PTFE laminate, with MICA caps, improved layout and multiturn precision trimmer for power reading adjustment. Mounts with screws directly to the heatsink. 2000W Low Pass filter with easy connect DIGIAMP system, built for our MAX PRO 6015/7015/8015 series exciters. The DIGIAMP interconnect system enables easy integration into a FM transmitter. All it takes is one flat cable (DIGIAMP). This connection enables measurement of SWR and Power, amplifier supply voltage, current and temperature. It also provides SWR protection and automatic output level limiting. Of course it also includes low pass filter as RF amplifiers produce harmonics at even multiples of fundamental frequency. If your harmonics fall on or near a TV channel or Maritime frequency you could cause severe interference to that channel. The most common cause of fines from federal agencies is due to TVI or other interference from your transmitter which generates a complaint. Use of this low pass filter is the best method of eliminating this kind of interference. The low insertion loss of this filters makes them well suited for use at power levels as low as 10 watts on up to 2000 watts!

These units are constructed using PTFE laminate for capacitors and silver-plated coil wire! SWR and PWR voltages are provided for power/swr measuring purpose. Two calibrating trimmers are provided as well to adjust correct power and swr measurment accuracy. SWR protection circuitry is provided as well and its sensitivity can be adjusted with one of the trimmers (requires MAX PRO exciter for ALC to work). When reflected power (SWR), current or output power reaches certain level swr protection output decreases RF output (either via MAXPRO exciter with ALC pin or via bias disable)..

A perfect companion for the pallet amplifiers, offering output filtering and swr protection!

Fits directly into our 1000-1500W ampbox, when used with our ampbox the output N connector can be directly soldered to the filter.

Technical specifications:
– Input/Output Impedance: 50 Ohms
– Insertion Loss: 0.25 dB typ.
– Size: 156mm x 113mm x 30mm high
– Power handling: 2000W with forced air ventilation
– Typical stop-band attenuation: >50dB
– Cut-Off Frequency: 120 MHz (-3dB down)
– Input/Output Connectors: solder pads for coax, output N connector can be directly soldered in our 1000-1500W ampbox.
– Duty Cycle Rated for continuous operation with forced air cooling

Use with MAXPRO FM exciter:
– Connect input and output with RG-142 or thicker PTFE coaxial cable.
– Mount to heatsink with screws, best done with our 1000-1500W ampbox.
– Connect with digiamp cable to our exciter
– Set all protection/limit trimmers to off first
– Set power/SWR trimmers for correct reading on LCD
– Now set tx to max intended power (for example 500W), than adjust SWR protection, power limit and current limit trimmers to the point where they almost start to reduce output power

Use without our FM exciter:
– Connect input and output with RG-142 or similar PTFE coaxial cable.
– Mount to heatsink with screws, best done with our 1000-1500W ampbox.
– Connect bias disable PAD on the filter to your pallet’s bias voltage so that filter’s protection circuit can pull bias voltage down. See all the photos for this product to understand how ALC works. Each pallet is a bit different so we can’t tell you exactly how.
– Set all protection/limit trimmers to off first
– Set power/SWR trimmers for correct reading on LCD
– Now set tx to max intended power (for example 500W), than adjust SWR protection, power limit and current limit trimmers to the point where they almost start to reduce output power

What is included:
– 10K NTC resistor (temperature sensor)
– LPFMAX 2K+ filter