邊緣接收
如果大廈結果屬 M 類，畫面起格或聲畫不同步就會更常見，特別在天氣轉差或線路損耗較高時。
香港電視覆蓋查詢Hong Kong TV Reception Lookup
起格與窒聲Pixelation
故障排查
起格、窒聲或畫面斷續
通常代表甚麼
這種症狀多數不是完全收不到，而是訊號剛好不穩定。常見原因是邊緣接收、分線損耗、舊天線或單位內線路老化。
Troubleshooting
Pixelation, Freezing, Or Audio Lag
What It Usually Means
These symptoms usually mean unstable signal rather than total loss. Marginal coverage, splitter loss, old antennas, and in-flat wiring are the common causes.
常見原因
分線器損耗
同一條訊號分到多部電視時，分線器與接頭每多一層，訊號就可能再弱一點。
舊天線或放大器
舊式設備老化後，即使不是完全失效，也可能只剩下勉強可用的狀態，令畫面容易斷續。
單位內線路老化
牆身插座、壓接頭、舊電視線或接駁器本身，都可能造成間歇性訊號下降。
Common Causes
Marginal Reception
If the building result is M, pixelation and audio drift become much more likely, especially when conditions worsen.
Splitter Loss
Every extra splitter, connector, and path length can reduce the usable signal level before it reaches the TV.
Old Antenna Or Booster
Aged hardware may still work, but only barely. That often shows up first as freezing or unstable picture quality.
In-Flat Cable Ageing
Wall outlets, connectors, old coax cable, and joiners can all introduce intermittent loss.
如何判斷問題在哪裡
只有某些頻道起格
先重新搜台，再留意是否所有頻道都受影響。若只影響部分組合，值得檢查天線與整體接收穩定度。
只有某一部電視起格
可先交換房間或線材測試。如果問題跟著位置走，多數是插座或線路；如果跟著電視走，則可能是設備本身。
晚上較嚴重
這通常反映本身訊號餘量不足，而不是完全中斷。邊緣接收加上線路損耗時最容易出現。
How To Narrow It Down
Only Some Channels Break Up
Rescan first, then see whether the issue affects every multiplex or only part of the channel lineup.
Only One TV Is Affected
Swap rooms or cable paths. If the problem follows the outlet, it is usually wiring. If it follows the TV, check the device itself.
Worse At Night
That often suggests limited signal margin rather than a total outage. Marginal coverage plus cable loss is a common pattern.
下一步
想知道是大廈接收還是你單位內部問題？
先查大廈結果，再把「起格或窒聲」情況發給 Techiteasy，會更容易判斷是否需要檢查天線或室內線路。
Next Step
Need to tell whether it is building-level or in-flat?
Search the building first, then send the pixelation symptom to Techiteasy for a more focused check.