手機驗證認證
双极天线 业余无线电 短波电台垂直八木倒V正V10米
2025-09-25 17:43:45发布
信息编号：13688500
| 公司： |
河南邦信防腐材料有限公司
|
| 聯系人： |
馬婷(銷售人員) |
| 所在地： |
河南 -
鄭州,河南省鄭州市金水区国基路建工集团
|
| 價格： |
面議 |
| 聯系： |
微信：bangxin100
電話：0371-69103257
手機：19138062880
|
双极天线杆的信号覆盖范围并非由杆体单独决定，而是 **“天线性能 + 杆体适配 + 环境干扰”** 共同作用的结果，核心影响因素可归纳为 4 类，其中天线本身特性和环境遮挡是最关键变量。
1. 核心变量：双极天线自身性能（决定覆盖上限）
雙極天線杆的信號覆蓋基礎是其所搭載的雙極天線，天線的核心參數直接決定了覆蓋範圍的理論上限，與杆體無關但需杆體適配其安裝要求。
天线增益（dBd/dBi）：增益越高，信号方向性越强、覆盖距离越远。例如，普通半波双极天线增益约 2.15 dBi，覆盖半径通常 1-3 公里；高增益定向双极天线（如八木型双极天线）增益可达 8-12 dBi，覆盖半径可扩展至 5-8 公里，但需杆体精准固定其方向，否则增益会因角度偏移而衰减。
工作频率：频率越低，信号绕射能力越强（可绕过小障碍物）、传播损耗越小，覆盖范围越广。例如，150MHz（VHF 频段）双极天线，在开阔地覆盖半径可达 10 公里以上；430MHz（UHF 频段）双极天线，相同功率下覆盖半径通常仅 5-6 公里，需通过杆体升高高度来弥补损耗。
發射功率：在天線參數固定時，發射功率越大，信號覆蓋越遠（功率與覆蓋距離呈正相關，但受法規限制，民用通常≤5W）。此時杆體需穩定支撐天線，避免因晃動導致信號不穩定，間接保障功率有效傳輸。
2. 关键辅助：杆体安装参数（优化覆盖效果）
双极天线杆通过调节 “高度” 和 “角度”，可化利用天线性能，减少环境遮挡，是提升覆盖范围的重要手段。
安装高度：高度越高，信号传播时受地面障碍物（如房屋、树木）的遮挡越少，覆盖范围越广。通常情况下，杆体每升高 10 米，开阔地覆盖半径可增加 2-3 公里（符合 “视距传播” 原理）。例如，2 米高的杆体搭配 150MHz 天线，覆盖半径约 8 公里；12 米高的杆体搭配同款天线，覆盖半径可增至 11 公里左右。
角度精度：若使用定向双极天线（如用于点对点通信），杆体需精准固定天线的俯仰角（垂直方向）和方位角（水平方向）—— 角度偏差超过 5°，信号增益可能衰减 30% 以上，覆盖距离直接缩短一半；若为全向双极天线，杆体需保持天线垂直，倾斜超过 10° 会导致信号在某一方向出现 “盲区”。
3. 主要干扰：环境传播损耗（压缩覆盖范围）
环境是信号传播的 “阻力”，不同场景的损耗差异极大，会直接压缩理论覆盖范围，这是维护时需重点应对的因素。
地形遮挡：山地、丛林、高楼密集区会严重阻挡信号 —— 例如，开阔地覆盖 10 公里的天线，在城市高楼区可能仅覆盖 2-3 公里（信号被建筑反射、吸收）；在茂密丛林中，覆盖半径可能不足 1 公里（树叶对 UHF/VHF 频段信号的吸收率达 60% 以上）。
电磁干扰：变电站、基站、高压线路等会产生电磁噪声，干扰双极天线的信号接收，导致 “有效覆盖范围” 缩小（虽信号能传到 5 公里，但受干扰后无法正常通信，实际可用范围仅 3 公里）。此时杆体需避开干扰源安装，而非调整杆体本身。
4. 基础保障：杆体与部件状态（维持覆盖稳定性）
杆体和衔接部件的完好度，决定了天线性能是否能稳定发挥，若出现故障，会间接导致覆盖范围 “隐性缩减”。
杆体稳定性：若杆体倾斜、晃动（如地钉松动、支架变形），会导致天线角度偏移，信号增益衰减，覆盖范围随之缩小；若杆体在强风天气下剧烈晃动，还可能导致天线与线缆接触不良，出现 “信号时断时续”，实际可用覆盖范围大幅下降。
部件老化：衔接处的锁扣、线缆接头若生锈、氧化，会增加信号传输损耗（损耗每增加 1dB，覆盖半径约缩短 10%）；天线固定支架若松动，会导致天线振子间距偏移，破坏双极天线的对称结构，直接降低信号辐射效率，覆盖范围自然缩小。
![双极天线 业余无线电 短波电台垂直八木倒V正V10米]( "双极天线 业余无线电 短波电台垂直八木倒V正V10米")
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