SatCatcher Digipro C Max Professional

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TEST REPORT Digital Cable Meter An Accurate Instrument With Many Accessories Accuracy is something that every installer will value with a signal meter but apart from that true professional users have further demands on a meter: the instrument should have a bright and readable display, and its keyboard should be easy to operate. It should also offer a wide choice of accessories making the work simpler and more efficient. To our delight, the new Digipro C Max by Satcatcher fulfills all those requirements. Its display is exceptionally bright and clear, you can operate its keyboard even with gloves on your hands, and the number of accessories they offer to the professional user is really surprising. The meter can be supplied packaged in two ways. In a metal box like other Satcatcher meters or in a premium package with lots of extras included. For our test we opted for the latter and were delighted at the many useful accessories. The most unusual and most useful for an installer is a fully adjustable vest with a lot of pockets and straps. It allows you not only to transport and use the meter in a convenient way but also to keep handy all sorts of other tools an installer must have. Apart for the vest, you get a plug type power supply, a car lighter DC charger, a neck strap with a piece of sheep skin fur to avoid skin irritation, and a bad weather cover for the meter along with an attachable sun shade. Everything is neatly packed in a carrying bag so you do not need to worry that your meter accessories will disappear somewhere over time. The workmanship of the Digipro C Max is very good. The enclosure is robust but quite elegant at the same 36 TELE-satellite International — The World‘s Largest Digital TV Trade Magazine — 02-03/2012 — www.TELE-satellite.com 02-03/2012 Satcatcher Digipro C Max More than a cable meter: includes everything a professional installer needs time. Buttons are large and clearly labeled. The POWER button has an edging around it what guarantees that the meter will not switch on accidentally when pressed against a solid surface. The keyboard consists of a numeric keypad, quick access buttons, navigational arrows and 4 function keys F1 - F4. The function of these F1 – F4 buttons depends on the particular menu or screen you arrived at and is always explained at the bottom of the display window. Speaking of the display, it is one of the strongest points of this meter. This TFT LCD It is very bright and clear. You will be able to read it even outside in a very sunny day. There is also a loudspeaker embedded in the Digipro C Max Professional, giving off a significant sound volume. The Digipro C-Max Professional lets you either use a pre-programmed channel band plan or you may choose to blindscan the whole bandwidth. The effort you put into the initial channel band plan programming will pay off in much quicker measurements. To create a band plan, you enter the Meter Config menu and select Edit Channel item. In this screen, you edit the channel name (most of the installers would probably use the standard channel designators like: S02, S28, K32), its kind (analog or digital), and a number of parameters as: frequencies, modulation, symbol rate, bandwidth. Of course there is a different set of
Table 1. Digital TV signal measurement results Power [dBµV] MER [dB] Signal C-Max Ref C-Max Ref 256QAM 474 MHz 87,1 87,7 38,8 36,7 64QAM 474 MHz 87,1 87,7 37,9 36,8 256QAM 674 MHz 82,5 83 39,4 35,6 64QAM 674 MHz 82,6 82,8 38,7 35,4 parameters for analog and for digital channel. In this way, you edit channel by channel and save them in the meter’s memory. Such a list of the channels that are present in a given cable network is called a band plan of this network. Once you have created a correct band plan for the cable systems you are about to install and measure, you can enter the Auto Measure menu item and make the meter measure every channel form the list one by one. However, it is also possible to scan an unknown network. In such case, the Digipro C-Max does a smart thing: it recognizes fully automatically all analog channels as well as the QAM modes and symbolrates for the digital DVB-C channels. For analog TV channels it shows the video and audio frequencies along with their signal levels and S/N ratio. The measurement results screen for a DVB-C signal is naturally more complex. You get not only signal frequency, QAM order, symbol rate, channel power, modulation error ratio (MER) and carrier-to-noise (C/N) readings but also a graphic representation of the constellation diagram. By pressing a button you can enlarge the diagram. This is perfect to asses the signal quality visually: the tighter the green dots’ concentration in the center of the squares, the less noisy the signal is. Of course, visual assessment is rather subjective and not very accurate, therefore there are MER and C/N readings that correspond to the quality of the digital signal. Furthermore, the Digipro C-Max offers a spectrum view. It produces a clean picture of the frequency spectrum with adjustable span and amplitude. You can set the following frequency spans: FULL, 500, 200, 100, 50, 32, 16, and 8 MHz. Maximum amplitude can be set from 60 to 120 dBµV in 10 dBµV steps. Digipro C-Max creates a very readable spectrum picture. It does not take long to scan the whole bandwidth. Even the best looking meter, and Digipro C-Max looks great indeed, would not be worth its price if its measurement results were improbable. Therefore, we compared the results produced by the Digipro C-Max with another high class reference meter. We are delighted to announce that the results were in perfect agreement. Please examine Table 1 and Table 2. Both for digital and analog TV signals, the channel power results were practically identical. Also the MER measurements were matching one another very well indeed. The only differences we noted in the S/N measurements, this, however, is common between different meter brands. That’s because S/N measurements depend on the particular frequency a me- Table 2. Analog TV signal measurement results Power [dBµV] S/N [dB] Signal C-Max Ref C-Max Ref Video 471,25 MHz 61,3 64,4 23,7 48,6 Audio 477,75 MHz 50,4 52 Video 576,25 MHz 64 63,7 26,1 17,7 Audio 581,75 MHz 50,3 49,8 ter takes as a noise reference level. As a result, S/N and C/N can be compared only if measured with the same meter model but not when measured with different models and makes. MER is a much better signal quality indicator as this value can be measured with different meters and you can expect similar results with any product. Our general conclusion: Digipro C- Max is a very accurate meter and you can fully rely on its signal strength and MER measurements. A great highlight is another positive feature: the Digipro C-Max not only takes measurements but it can also play back digital channel video and audio. Once it locks to the signal, it searches the NIT table inside the transport stream and based on the informations found there, the meter displays a list of TV and radio channels. The last remaining step is to select the channel you want to watch and press a button. Of course, this works only for FTA channels as the meter does not have any CI slot or smart card reader and can not descramble PayTV channels. The Digipro C- Max does not display analog TV channels either but taking into account how fast the technology advances, analog channels will disappear from CATV networks anyway quite soon. So this is not something to care about. Finally we come to a truel- ■ TELE-satellite expert Jacek Pawlowski wears the installer's vest from Satcatcher. The vest offers multiple pockets for the installer - and even matches the Digipro C-Max protective case' color! 38 TELE-satellite International — The World‘s Largest Digital TV Trade Magazine — 02-03/2012 — www.TELE-satellite.com www.TELE-satellite.com — 02-03/2012 — TELE-satellite International — The World‘s Largest Digital TV Trade Magazine 39
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SatCatcher Digipro C Max Professional

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