SCR950 – Yamaha scrambler for the city and outdoors?

The SCR950 is inspired by the Yamaha street scrambler of the 60s and is designed for motorcycle enthusiasts of that era. Another bike from the Faster Sons series is designed for city riding and gravel trail exploration. But is this really so? More on this in the next review. Welcome!

The SCR950 for the bank is suitable for city riding, but also suitable for the track. While I didn't have the opportunity to ride it fast or personally "fly" long distances, the bike was comfortable and so I imagine it will perform well on the road. How focused are you on cruising? And this is at a speed not exceeding 100 km/h. Driving it faster is not particularly pleasant. And I wouldn't ride too much in this gravel because in my opinion the bike is not very suitable for it. Well, if you don't like drifting. In general, a motorcycle for riding according to the rules in front of you and silting in the right lane on the highway. Not that he criticized this style. Often, high power is associated with driving “at full …”. And on this motorcycle you will enjoy a completely different ride.

Yamaha SCR950

Driving impressions of the SCR950

This motorcycle is a yacht, not a motorboat. Before this, it literally flows and does not go. The bike itself rewards the rider for speeds of 80 – 90 km/h. There is no temptation to rev it up. Encouragement for more decent driving. I would say that when you get on this bike, you want to promote yourself. Slowly in front of you, like a nobleman on a horse, so everyone can see. And indeed, people follow this moto because it looks nice and sounds good. At the same time, the exterior is not hostile, it is curious, and you feel like a tourist attraction on the road. Well, the bike has something that catches your eye. Sam caught that after the exit and the “aggressive” drive, I went into Lance mode. After the first hundreds of kilometers of conversion, I traveled much more calmly on this bike. And so it should “fly”.

Yamaha SCR950

Do-it-yourself scrambler for a radio station

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Hello, dear radio specialists and beginning radio amateurs!

I would like to offer to your attention a free version of the Scrambler/Descrambler on the FX118DW chip. This chip contains a module that can be implemented in RPD and RPU device nodes as a speech encoder and decoder.

I provide information and description about this design in the original from the source:

To make your radio communications unintelligible. Its small size, due to the use of surface components, can be inserted into virtually all transceivers. It can also be used on a private telephone network. Operating full-duplex connections at 2.54 mm. Available as a kit.

Since it was invented, the radio is certainly the most practical and most affordable way to connect remotely. Indeed, many people who carry a single card, a VHF or dual-band talk daily with other people, sometimes long distance, or simply listen to the transmissions. By the very fact of using air as a means of propagation, the radio is not a closed system. Thus, when one sends a radio signal, it can not only match intended. It spreads over an area more or less extensive and can be picked up and listened to by anyone with a receiver tuned to the same frequency. It is therefore obvious that in a communication between two parties, one side can easily interfere. A solution to prevent these intruders in a radio conversation could be that would be to use a frequency outside the bands normally allowed. In this case, it will be difficult to find a curious can lock onto the frequency. Anyway, with the proliferation of scanners, even this ultimate solution, of course illegal, would not help much if it is some trouble with the Administration! The advent of scanners has made “public” radio communications, even those that would normally remain confidential, such as those in law enforcement, for example. Against intrusion into the radio, yet there is a cure: the coding of transmitted signals. In this way, a person can enter in a communication to listen but can not understand the meaning of the message, unless you know the coding system and a decoder adapted. In the field of radio, as well as in telephony, this type of encoder is called “scrambler.” “Scrambler” comes from the English verb “to scramble” meaning mix, mingle in confusion. The scrambler is a device that converts voice into a sound incomprehensible. In order to understand the signal produced by the scrambler, it must pass another scrambler, identical to the first, to decode it.

Scramblers

There are currently various Scramblers, more or less complex inversion band, with band inversion coding, digital and many more. The scrambler the simplest and most used of course, is the inversion band. There are integrated circuits as the COM9046 or FX118 who realize exactly this function, with two identical channels for working for a duplex transceiver. It's one of these two integrated circuits, the FX118, we used to develop this new project scrambler inversion band. The circuit is very simple and very reliable. It consumes very little and can be powered with only 3 volts DC. This new scrambler offers not only extremely compact dimensions, both in the area it occupies as its thickness, which measures about 3 millimeters, but it also lends itself to vertical mounting for all connections (power, inputs, outputs) are on the same side and are at 2.54 mm. This means that the scrambler can be inserted into a support integrated circuit without any problem and obviously it will occupy only one side. All this has not been obtained by a miracle, but using only components designed for surface mounting. The integrated circuit of the scrambler is also CMS. This project, technologically advanced, can be inserted practically anywhere: in the apparatus CB, VHF transceivers, cordless phones, telephones. The choice of the technology components of the surface is, in our case, required because there is no way to get all the features of our circuit with conventional components. Obviously, the mounting CMS has more difficulties in the practical because it requires precision and a suitable tool for welding. However, the circuit is easy to develop, especially with a little experience.

Fig.
1: The FX118, a dual frequency inverter. Operation

Turning now to consideration of the scrambler, which, as we have said, is to reverse band. This term means that to make the incomprehensible speech signal, the scrambler is able to move the bandwidth compared to a reference frequency. Practically, to understand what the scrambler inversion band, simply draw the bandwidth on a sheet of paper for example by limiting to 3 000 Hz and reverse the curve drawn by the axis corresponding to 3000 Hz Clearly, this means that, on the spectrum, the scrambler performs a symmetry of the frequency band relative to the axis of the 3000 Hz The inversion of the band is done in the integrated circuit FX118 is the heart of the assembly. To work, this component requires only a few external capacitors and resistors and a few neighborhoods tz. So let's see what these external components and how to work the FX118.

Schematic scrambler.

charts illustrate the principle of operation of Scramblers inversion band. In our case the beat frequency is 3300 Hz

Layout and PCB-wide 2.
Component List

R1: 22 kW R2: 1 MO R3: 22 kW A4: 22 kW A5: 22 kW C1: 47 pF C2: 100 nF C3: 100 nF C4: 100 nF C5: 47 pF C6: 100 nF C7: 100 nF C8: 100 nF C9 100 nF C10: 100 nF U1: FX118DW U2: 78L05 Q1: Quartz 4.433619MHz

Others: CI ref. E44 All resistors and capacitors are surface mount.

Practical implementation

Now that we know the new scrambler, we can take care of its practical implementation, which is done by using surface components and printed circuit board. Even if we said that the circuit does not require components exclusively in CMS, an exception can be made (and we did it) for the voltage regulator 78L05. We can actually use a controller for traditional mounting. By cutting the legs to 3 mm of the box, just to weld and bend the regulator so that the flat side is found resting on the PCB. You need to use a 78L05 TO92 plastic case. For assembly and the respective positioning of other components, except the integrated circuits that are large enough, we recommend using a small clamp type “Brussels” and a soldering iron 20 watt maximum with a fine tip. The weld must be, too, fine 1 mm maximum. For all welds, you should not let more than 4 to 5 seconds consecutive failure of iron on the component. For connections to the outside, several choices are possible: for example, you can extract the contacts of a circuit support single or double lyre, or use a bar scored 13 points at 2.54 mm. You can even use the tails of resistors or capacitors (not CMS course!).

Start

The scrambler will connect then very easily. The first channel is used for reception. IN1 on it connects the AF output of the device to be protected (signal line) and recovered the inverted OUT1 signal for injection into the audio input. The second channel is used for transmitting. The signal produced by the microphone is applied to the input IN2 and OUT2 of the inverted signal is fed to the microphone input of the transceiver. In use, you may decide to change the voltage gain of a channel or two if you wish. For example, the gain of the channel reserved for issuance may be unitary, while the reser ve the reception will be higher. For verification, you must agree with someone who has a scrambler identical (you must build two) and make a conversation with the device connected as we described. In practice, it will be necessary to install inverters so as to connect or disconnect the device under normal use or scrambler.

the photo, a pair of mounted Scramblers.
The connections are at 2.54 mm. Source

Driving the SCR950

The motorcycle is equipped with a powerful engine with a volume of almost a liter. But only 55 horses are idle at the top of the heart. We can say that this is not much. However, we have good torque (79 Nm) available from just 3000 rpm. Therefore, all power is generated very low. Basically, due to the 5 thousandth rotation of the herd, we scatter and there is nothing more to look for. This is what makes this bike fly at low revs. But without going to extremes, because then it will be too stressful. For this we have a drive belt and a rather hard-working box. You need to operate the clutch longer so that gear shifts are smooth and without knocking. This is definitely easier to do at low speed. All in all, I got the bike up to almost 180 km/h, but... that's not the case on this bike. Combustion during testing was 6 g. 84 l / 100 km, but the manufacturer guarantees 5 l / 100 km - and I would believe it. The first tank was ambitious and the stroke was small

Yamaha SCR950

Synchronization

In the AD scrambling method, synchronization of the states of the scrambler and descrambler registers plays an important role, because if it is lost, all further information is inevitably lost. To maintain synchronization in practice, methods are used such as adding synchronizing bits to the information stream that are known in advance to the receiving side, which allows it, if such a bit is not found, to actively begin searching for synchronization with the sender, and the use of high-precision time pulse generators, which allows synchronization to be decoding of received bits of information “from memory” without synchronization. It is worth noting that it was the need to synchronize scramblers that led James H. Ellis to the idea of ​​public key cryptosystems, which subsequently led to the creation of the RSA encryption algorithm and the Diffie-Hellman protocol.

Brakes in SCR950

The brakes on this bike are weak. I understand that this is not a speeder, but with such mass I would take care to reduce the speed. Meanwhile, both shields, one in front and one in back, are ridiculously small. I'll get back to you again. But for the front I would give two shields or one more effective one. When riding the SCR950, you have to consider the fact that you need more stopping space. To do this, two fingers on the handle and constant use of the backrest - this becomes an integral driving style. So, quick summary: the brakes are definitely too weak.

Yamaha SCR950

Honda Dominator

Another great scrambler base from Honda, the Honda Dominator or Honda NX-series. Wide range of engine sizes, all single: 125, 150, 200, 250, 350, 400, 500 and 650. The 650 is the dominant model. A bit more plastic than the Honda mentioned above. Fun fact: The Dominator uses the frame itself as an oil reservoir.

How does SCR950 work?

As I mentioned earlier, this bike is a sail bike. The weight + suspension creates a sofa-like feel with few bumps in the road. If there are more holes, then the moto begins to sway. On the plus side, there's a low center of gravity and a wide handlebar. You can ride freely and without fear, maneuvering at speeds close to zero without supporting your legs. Driving slowly is nice. You drive fast - it blows and teleports. The ankle tire is supposed to help you descend on gravel roads, but at the same time it causes wheel vibration. Unpleasant. Plus it's noisy. I would prefer a road tire and give up this area.

The bike performs well and handles well at low speeds. But the handlebars are so wide that you can grab them by hand, and the full steering radius is only available by pushing down on the bike. Overall, the SCR950 is easy to operate. Getting between cars in traffic and maneuvering between them was not a problem. Like previous motorcycles styled after older models, there's nothing about this one that can handle even the air for the rider. Also feel the resistance of the substance in adverse conditions, especially at high speeds.

Yamaha SCR950

Production models

In the modern world, serial scramblers are practically not produced for purely economic reasons. There are too few lovers of such exotics in the world, and most motorcycle manufacturers consider it unprofitable to develop models aimed at such a small audience. But there are also pleasant exceptions, moreover, of European origin. Thus, the famous company Ducati has long released its model with the self-explanatory name Scrambler , and it fully lives up to its name. And later the British gentlemen from Triumph stepped up and offered customers a new product with exactly the same name. Even from the photo it is clear that these models fully correspond to the class being described, although the list of serial scramblers, of course, is still very short. Perhaps this will change in the future - motorcycles for the road surface of any quality appeal to many, and some are captivated by the retro design.

Position, ergonomics

Generally, you need to pay more attention to your legs on this bike. When stopping, we need to move our leg back a little relative to what is natural for us. Otherwise, the shin, ankle and calf will suffer. Also, after removing your leg from the set, you should jump back... or forward - if you are over 180cm tall. One thing to remember is that behind the set, right behind the set, there is a warm exhaust. Here the manufacturer cleverly defended itself from lawsuits and inserted a small heat shield that performs its function perfectly. But the set is mainly on the exhaust. The intention is to provide a simple position with a slight bias, but here I would simply put forward these approaches. As is the case with HD motorcycles. This will solve the problem of bruises and, by the way, will be climatic. It should also be noted that the sofa is relatively low.

In addition, we fly on this moto with our legs in the “ten seconds from now” position. Otherwise, the knees come into contact with the head, and the legs encounter engine elements that protrude firmly beyond the contours of the tank. Okay, but we know that for such a bike this point is more natural. This, however, causes the knees to get air or water in the rain. Rain is actually a crime. Raindrops penetrate right under the chest, down to the trousers, shoes collect splashes from under the wheels, and knees also collect them. Moreover, it broke my heart to see this motorcycle covered in mud. I don't recommend

Nuno Capêlo and Ricardo Santos

This heavily redesigned XSR700 based scrambler solves both of these problems. It is the result of a collaboration between Portuguese builders Nuno Capêlo (Capêlo's Garage) and Ricardo Santos (Elemental Rides), commissioned by Yamaha Portugal.

This is not the first time Nuno and Ricardo have worked together for Yamaha Portugal - they created the Yamaha SR400 two years ago and were both pleased with the collaboration.

Yamaha XSR700 Scrambler

This XSR700 was built as part of Yamaha's Europe Yard Built program, where motorcycle builders from nine different countries exhibited their motorcycles. The theme of the project was “Back to Dirt”, and this XSR lives up to it.

“I spoke to Ricardo,” Nuno tells us, “and he was completely enthusiastic about the idea. His first thoughts were very similar to mine, so I stopped whatever I was doing and started drawing. After Ricardo and I exchanged many drawings, we quickly came up with the final design for the bike.

The Yamaha XSR700 has a good frame and a powerful and versatile engine. But Nuno and Ricciardo wanted to improve the bike's off-road capabilities - and give it a neo-retro style inspired by the iconic Yamaha motorcycles of the 70s and 80s. That's why they called it "XSR700 TT" - True Tribute, which can be translated as "pay tribute."

Yamaha XSR700TT

What else about SCR950

History thanks the man who gave the green light to the speedometer. It's a little round, but still square and just plain ugly at the same time. Completely absent. The only digital round clock I liked was used in the XSR, and I don't know why a similar solution wasn't used here. Or a regular tip with an odometer. Because basically the functions of this box are limited to clock, course and speed. Luckily, unlike the CMX , this bike has the key and lock on the same side, next to each other. The SCR950 does not have any accessories other than ABS.

But he looks really decent. Classic seamless tank, cell for starting number, good sofa, excellent mirrors, classic front lights. Cool picture in this test unit, there is also a black only option - but the red tank and white accessories on a black background are much better in my opinion. All in all, this great braid is probably the only part of the bike that helps the tarmac fall off. Even on slippery ground the motorcycle will find solid support. Overall, the only things missing from the set are a leather jacket, an exposed peanut, and tinted glasses.

Do you like the 1960s vibe? This bike is for you. He will find his followers in the bank.

Yamaha SCR950

More detailed technical information can be found on the manufacturer's website. Below is a basic combination of numbers, a video review and several photos.

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Suzuki DR650

Suzuki's machine for the dual sport market is the DR650. Also one 650 cc engine. See Air and oil cooled, 46 hp. a bit more for your money compared to the KLR. The model hasn't changed for many years either, so it's easy to find parts at relatively good prices.