Analog Video Surveillance
Analog vs. Digital (IP) — What's the Real Deal?
Technically, pure analog surveillance systems are almost extinct these days. That’s because even though the cameras still capture an analog signal (smooth changes in voltage over time), at some point, modern recorders or PCs with capture cards convert that signal into digital data (Figure 1).
So when we talk about “analog systems,” we’re really referring to setups with analog cameras and matching data transmission methods. Let’s dive into what makes these systems tick, their perks, downsides, and unique features.
Installation: Old School, but Reliable
Setting up analog cameras takes effort since each one needs its own connection. Maximum cable length depends on the type and quality:
- High-quality coaxial cable handles up to 328 feet without extra gadgets. If your cameras are 164 to 328 feet from the recorder, this works well for smaller properties.
- Twisted pair cabling with special baluns can stretch beyond 3,280 feet for long-range installs.
Dealing with Interference
Analog signals are prone to interference. For long cables, maintaining image clarity can be tricky:
- Coaxial cables have less shielding than twisted pairs, making them more vulnerable to noise.
- For noisy environments like factories, designing a system with interference in mind is key.
Rock-Solid Reliability
Analog systems shine in reliability. Since software only plays a role at the recording stage, system crashes are rare. Overall performance depends mostly on hardware quality. Stick to trusted brands and solid installations to avoid headaches.
Expanding the System
Adding cameras later? It can get pricey. You’ll need to expand recording capacity, which might mean:
- Buying a new DVR
- Adding a capture card to your PC, which is cheaper and more flexible.
For small setups, no special training is required. Many homeowners can DIY their analog system for a cabin, vacation home, or apartment.
Cost and Value
Analog setups are budget-friendly with a range of affordable options. Installation costs, compared to IP systems, are only significantly different for larger properties.
Analog Surveillance Kit
A basic setup includes:
- Cameras
- A DVR
- Power supplies for the cameras
While a PC with a capture card is an option, modern DVRs are simpler and more user-friendly. Keep in mind that hard drives (HDDs) aren’t typically bundled with DVRs.
When buying a kit, double-check it includes everything you need, or plan for extra gear like cables, connectors, and:
- Baluns for twisted-pair setups
- Noise filters for outdoor installs
Analog systems are a solid, affordable choice for homes, small offices, and retail shops. Just pick gear with the right specs for your needs.
Analog vs. Digital — The Showdown
To decide between analog and digital (IP) systems, it’s all about knowing your priorities.
Resolution
IP cameras win big on resolution. But for many uses—like home, cabin, or small retail—analog HD (AHD) is more than enough.
AHD technology delivers up to 1920x1080 pixels. Check your monitor’s resolution—if it’s similar, that’s plenty of detail.
And don’t forget: higher resolution often means slower frame rates (10-15 fps) and more processing power. Analog cams hit a smooth 25 fps every time.
Range
With wired systems, IP setups need a network switch every 328 feet. Analog video over twisted pair? You can push the signal for several thousand feet. Long-distance installs require some expertise, but the capability is there.
Why IP Is Awesome
- Tons of video analytics options
- Nearly limitless scalability
- Easy remote access via the internet
Bottom line: The best choice depends on your specific needs. Clarify your goals, and pick the right tech for the job!