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Description
WAVESHARE GNSS L1+L2+L5 Multi-Satellite Multi-Frequency Four-Wire Helical Active Precision Positioning Antenna, Q25, Q391. Connector type: SMA Inner Pin 2. Protection rating: IP67 3. Four wire helical antenna for GNSS, featuring high gain and wide circular polarization coverage angle 4. Receives more low elevation satellite signals, improving positioning performance; suitable for smart home, smart agriculture, and high precision map applications 5. Four wire helical structure with wide circular polarization coverage angle, enhancing low elevation satellite signal
1. Connector type: SMA Inner Pin
2. Protection rating: IP67
3. Four-wire helical antenna for GNSS, featuring high gain and wide circular polarization coverage angle
4. Receives more low-elevation satellite signals, improving positioning performance; suitable for smart home, smart agriculture, and high-precision map applications
5. Four-wire helical structure with wide circular polarization coverage angle, enhancing low-elevation satellite signal reception capability
6. High gain, low noise figure design, supports multi-frequency, multi-system GNSS signal reception
7. Small size, lightweight, flexible installation, suitable for various devices and applications
8. Uses SMA interface, supports RF transmission and coaxial DC bias feeding function
9. Meets IP67 protection requirements, suitable for long-term stable operation in outdoor environments
Antenna characteristics
1. Frequency range:
- GPS: L1/L2/L5
- BDS: B1/B2a/B2b/B3i
- GLONASS: G1/G2
- Galileo: E1/E5a/E5b
2. Antenna gain: Q25 2dB; Q39 2.5dBi
3. Characteristic impedance: 50Ω
4. Polarization: RHCP (Right-hand circular polarization)
5. Coverage angle: 360 degrees
6. Dimensions: Q25 58.70 x 27.70 mm; Q39 40.80 x 44.30 mm
Amplifier characteristics
1. Gain: Q25 37dB; Q39 28dB
2. Noise figure: 1.5dB
3. Operating voltage: Q25 3.3V ~ 16V DC; Q39 3.0V ~ 16V DC
4. Operating current: Q25 13mA; Q39 15mA
Specification:
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4.5 ★★★★★
Based on 2025 reviews
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Product Reviews
★★★★★ 4
Helped Me Pass the CAPM
Format: Paperback
You need more than this to pass the exam, but this is an excellent study guide and structure. The practice questions are way easier than the actual exam. Don't let them give you a sense of false confidence. Especially if you don't have experience. I recommend to Google project management courses, IBM, or there's another one on Udemy. Use the PMI practice exam, too.
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Reviewed in the United States on December 7, 2025
★★★★★ 5
Helpful study guide
Format: Paperback
Helped me pass the CAPM. Broke material into domains and practice questions after each domain helps to apply the material to scenarios
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on February 11, 2026
★★★★★ 5
CAPM PASSED
Format: Paperback
Used this as main study tool passed on first try ! Studied from Dec 2nd -25 took test on Dec 26
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on December 27, 2025
★★★★★ 3
Typos and confusing/missing information
Format: Paperback, Format: Paperback
I finished Domain 1 and it's okay. Things are explained well, but there are a lot of typos and strange formatting. The cover of the book says 2025-2026, but the spine of the book says 2024-2025.
The way that the quiz questions are worded is confusing and sometimes repetitive. I had 2 of the same questions in a row in one section. I'm struggling to take some quizzes because the questions that are being asked do not reference any material from that section (or anywhere in the book so far). I feel like there is information missing in the sections because the quizzes have random terms that have never been mentioned.
Example: D1: Essential knowledge questions
I am being asked about estimation tools like story points, relative estimation, and planning poker. Nowhere in the book have those things been mentioned.
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Reviewed in the United States on July 23, 2025
★★★★★ 5
You got this! Focus on your education
Format: Paperback
Excellent !
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Reviewed in the United States on January 25, 2026