# Fixed Base UHF Station

A fixed 35 W SATEL-EASy Pro+ UHF station with AC power, outdoor antenna cabling and surge protection for long-range GNSS RTK correction broadcasts.

- Product page: https://catalog.satelusa.com/products/ks4/
- Category: Kits
- Status: current
- Part number: KS4

## Overview

KS4 is a high-power fixed UHF station for extending correction-data coverage from a permanent GPS or GNSS reference installation. Its SATEL-EASy Pro+ provides up to 35 W of transmitter power and broad over-the-air compatibility for reaching RTK rovers across large sites and difficult terrain.

The current package provides the complete RF path from radio to outdoor antenna: a short 195-series pigtail, broadband surge protector, 30 ft LMR-400 feed line and rugged fiberglass omnidirectional antenna. A YP1150 supply powers the radio from AC service, while a receiver-specific YCSWK interface cable carries correction data from the host equipment.

Fixed radio and antenna installations require appropriate frequency licensing, grounding, lightning protection, weatherproofing and structural mounting. Contact Satel USA to confirm the correct data cable and installation components for the host receiver and site.

## Highlights

- Complete fixed-position 35 W UHF base or reference-station package
- Rugged SATEL-EASy Pro+ radio with broad protocol compatibility
- Outdoor base antenna with a 30 ft low-loss feed line
- RF surge protection, AC power and receiver-specific data cable included

## Specifications

### Radio and data

- **Radio:** SATEL-EASy Pro+ YM6823 with up to 35 W transmitter power
- **Frequency range:** 403–473 MHz radio tuning range; supplied antenna supports 450–480 MHz
- **Data cable:** One compatible YCSWK-series interface cable selected for the host GPS or GNSS receiver
- **Power supply:** YP1150 AC power supply for the 35 W SATEL-EASy Pro+

### Outdoor antenna system

- **Radio pigtail:** CBL-TM-NM-195-3, 3 ft 195-series cable with TNC-male and N-male connectors
- **Surge protector:** YASP1G-NFF broadband RF surge protector with N-female connectors
- **Outdoor feed line:** CBL-NM-NM-400-30, 30 ft LMR-400 cable with N-male connectors
- **Base antenna:** YA05OD 450–480 MHz fiberglass omnidirectional antenna with 4.5 dBd gain
- **Antenna mounting:** Pole-mount brackets and stainless-steel V-bolts supplied with the YA05OD antenna

### Interface-cable examples

- **Carlson:** YCSWK-CF for a DB-9 female connection
- **Hemisphere and Carlson:** YCSWK-H1 for Hemisphere S320 and Carlson BRX-5
- **Leica:** YCSWK-L1 for Leica 1200, 1250, GS10, GS15 and related equipment
- **Sokkia:** YCSWK-S1 for 2700ISX or YCSWK-SG1 for GRX1 and GRX2
- **Topcon:** YCSWK-M1
- **Trimble:** YCSWK-T4

## Compatibility

- Altus and Ashtech GPS and GNSS equipment
- Carlson and Hemisphere GPS and GNSS equipment
- Leica GPS and GNSS equipment
- NavCom and John Deere GPS and GNSS equipment
- Sokkia and Topcon GPS and GNSS equipment
- Trimble GPS and GNSS equipment
- Other compatible OEM UHF RTK systems with a suitable interface cable

## Documents

- [KS4 Fixed Base UHF Station datasheet](https://catalog.satelusa.com/documents/ks4/KS4-Fixed-Base-UHF-Station.pdf) (datasheet, version 2026)

## Related products

- [SATEL-EASy Pro+](https://catalog.satelusa.com/products/satel-easy-pro-plus/)
- [YA05OD](https://catalog.satelusa.com/products/ya05od/)
- [YASP1G-NFF Broadband RF Surge Protector](https://catalog.satelusa.com/products/yasp1g-nff/)
- [CBL-NM-NM-400-30](https://catalog.satelusa.com/products/cbl-nm-nm-400-30/)
- [YP1150](https://catalog.satelusa.com/products/yp1150/)