One advantage of the capacitive isolator is extremely low insertion loss in the operating range. The VSWR (Voltage Standing Wave Ratio) is specified as 1.08:1 from 50MHz to 866MHz. Jensen claims a bandwidth of 1MHz to 1.3GHz ☓dB. At the power line frequency of 60Hz the device has extremely high isolation impedance, 1.3M?, but the impedance is very low in the RF region. According to my measurements, the device consists simply of two series capacitors, one in the signal path and one in the ground path. The Jensen VRD-1FF CATV isolator is unusual in that it is the only Jensen product that does not use a transformer (Photo 3). The supplied pigtail cable uses high-quality Canare F-connectors and Canare LV61S cable. Picture quality is visibly superior to transformer-coupled CATV isolators. This CATV isolator is capacitive, resulting in extremely low losses over a wide bandwidth. Photo 3: The Iso-Max VRD-1FF is the only product made by Jensen that doesnt use a transformer. Parts Express sells a similar device, the Dayton VIT-1, part no. This 75? to 75? isolation transformer costs less than $10. When in doubt, use an ohmmeter to check for continuity between the 300? and 75? sides, both signal and groundresistance should be infinite.Ī more elegant solution to CATV ground isolation is Xantechs model 63400 Ground Breaker. They are not baluns, and do not provide ground isolation. Some devices labeled matching transformers use an autotransformer. I have seen cheap ones that were actually nothing more than feed-through adapters no transformer, no impedance matching, and no ground isolation. But, it did cure the hum problem.Īnyone opting for this cob job approach should beware of certain devices being passed off as balun transformers. Garden-variety balun transformers typically have an insertion loss of around 3dB, so the total loss of this solution was around 6dB. My solution was to connect the 300? ends of a pair of 75? to 300? balun transformers back-to-back. I first ran into this problem around 20 years ago, before CATV isolators were readily available. A pair of Jensen CI-2RR stereo isolators are used in both the recording and playback signal path, providing ground isolation in both directions. We have a strong r&d team, can according to the sample you provided, manufacture the same product as your sample.Figure 6: A typical audio/video application for recording and playback. We do OEM for many clients, we have rich experience in production, we have molds in variety, and we have products strict quality control system. Features: + Plug-in installation, small size, easy to install, no screw fixing + Suitable in the circuit of line voltage 220v ac, 50Hz under rated power + Protector cut off power supply at once for exceeding the over voltage, and recover automatically 30s later after circuit back to normal + Automatic recovery delay time 30s: prevent additional damage to the electrical appliances due to frequently switch on and off caused by the unstable voltage + Protector also cut off power supply at once for voltage sag + Working status indicator: green for working (on), red for protection (off), yellow for time delaying (wait) + 750✬ high temperature resistant and flame retardant enclose + 0.7mm thick beryllium bronze + Domestic top brand high quality relay + All chip in Taiwan and USA imported original brandĪbout Payment we accept payment by T/T, Western Union, Paypal, Money gram, etc We Provide OEM Services We can do OEM for your brand (print your logo). And we can make product according to your design .The processing method, the size, the quality etc, will all follow your requirement . Normal voltage: 230V Frequency: 50/60Hz Surge Suppression:100J Low voltage out off : 165V High voltage cut off: 265V Timeout (delay time): 30sģ. TV, Video, Hi-Fi, PABX, Fax Machines and all electronic equipment up to 13 amps 30 Seconds start-up delay is built-in to ensure stability of the power supply. By disconnecting the power when it is bad, the VoltGuard safeguards against short Term and long term damage to ensure higher efficiency from your appliances. Typical Applications: All sensitive electrical and electronic equipments, especially For TV, Video, Hi-Fi, Fax, Photocopier, Cash Registers, Electronic Scales, Notebook, PC setc. These conditions are Harmful to electrical and electronic equipments. Protects against low voltage, brown-outs and voltage dips. TV DVD Guard High Voltage Surge Protector
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