KIT LPF Unit using low-pass filter 1000W PEP, have a SWR meter circuit

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KIT LPF Unit using low-pass filter 1000W PEP, have a SWR meter circuit:
$46.00

Information on KIT LPF Unit (LPF600).
LPF600 using low-pass filter 5th order. It is applied in the Solid State HF amplifier DN-600.
LPF600 allows you to filter the power to 1kW PEP. All of filters are for 50 ohm. Similar LPF used in amplifiers - ALS-600 - Ameritron, HL1.5Kfx - Tokyo Hy-Power.
For switching filters applied powerful relays with a current capacity 16A.Type of relay can be - HLS-14F2L-DC12V-C; HK14FH-DC12V-SHG; TRA2 L-12VDC-S-Z, and the like.
Have a built-in SWR meter circuit. Forward-Reflected display can be shown simultaneously on the dial indicators and LEDs. This is done in the amplifier DN-600. Details can be seen on the site page the board LPF600 have protection circuit if excess a predefined value of SWR. This protection circuit based on transistors VT1, VT2 and relay K16. Sensitivity of the circuit you can set by resistor R11. When the level exceeds the SWR Reflected, defined by resistor R11 value, the transistor VT1 will activate the relay K16. From relay K16, for example, you can cut off voltage for the input relay RX-TX in PA. Or cut off the supply voltage of the first stage PA. Protection scheme is with the \"sticky\" status, ie VT1 key state is hold until you will connect ESC contact with the ground or OFF/ON the main +13,8 V voltage for the protection board. Hi SWR indication LED, which is connected to the contacts +LED and -LED or in any other way, using the relay K16 contacts. LPF600, the filter switching is implemented with 2 options:
1. to ground one of 1-7 contacts XS1
2. +5-12v to 1-7 contacts XS2 LPF600 ideally suited for amplifier EB-104, RM KL800, RM KL-500, SG-400
This set of PCBs KIT LPF Unit (LPF600) consists of parts: 1. PCB LPF Unit - most of the components installed, see photos2. Ferrites - transformer T13. Relay R16 - NT73-2C-S64. Trimmer R3, R4, R8 – 3pcs5. Trimmer C16 4-20pFBy KIT is attached CD-disk with detailed description.
The board LPF Unit with the soldered details will look like this - Alexander UT2FW-R7ND