FilterMax IV replaces the FilterMax III. 

Fully compatible with the Bandmaster III and the EightPak and 4x8Pak.

The FilterMax IV contains six high performance bandpass filters in a single  package and comes standard with filters for 160, 80, 40, 20, 15 and 10 meters. All filters are elliptical designs (Cauer) which provide over 50 dB rejection of adjacent bands (excluding WARC bands). These filters are rated at 200 watts and can handle 100% duty-cycle modes, such as RTTY. These filters are designed be used between your radio and amplifier or antenna. They low insertion loss (less than 0.6 dB) and low SWR (less than 1.25:1) across an entire band. The filters can be selected via front panel pushbutton switches, via our ShackLAN system or remotely by applying +12 V DC for each individual band to the rear panel control connector. Bypass mode is automatically selected when no power is applied or no filters are selected. As is standard in all ShackLAN devices, the unit is protected against reverse polarity and over-voltage.

All filters in the FilterMax IV are constructed with high quality components using Micrometals toroid cores and low-dissipation, high Q TDK capacitors. While these filters are rugged, you should be aware of problems that can arise when operating the unit into a high SWR which can cause unexpected high RF voltages, even at 200 watts. Also, the filters are designed for 50 ohms and a large departure from the design impedance can change the filter response and you may not achieve optimal band to band rejection. Be aware that the tuners built into many radios will not correct any high SWR presented to the FilterMax IV. If you must operate into high SWR loads you should use an external tuner connected between the FilterMax IV and your antenna or antenna switch. Most amplifiers have a reasonable match on the input and should not normally present any problems.

The FilterMax IV is packaged in a heavy duty 0.09" (0.23 mm) thick extruded aluminum case. Front and rear panels are laser engraved so the lettering will not wear off with use. RF connectors have teflon insulation and gold plated center pins. Power requirements are 12-14 V DC at 150 mA.

Features

• Six bands in one integrated unit
• 200 W ICAS power rating
• SWR less than 1.25 across band
• Low insertion loss < 0.6 dB
• WARC band filters available
• Plug-in filters are easily exchanged
• Hand tuned for maximum performance
• Heavy duty extruded aluminum case with laser engraved panels
• Tough powder coat finish
• Custom labeling available
• Size: 3.5" H x 6.2" W x 13.6" D  (89 mm x 158 mm x 345 mm)
• Weight: 5.5 pounds (2.5 kg)

To download the user's manual of the FilterMax IV, click here

Insertion loss (S21) plots