Mini Fta Super Convert To Receiver Software Free Download
Aquilino Neadstine
I have an old Logitech wireless keyboard which is still working perfectly fine. I was wondering if I could use its Bluetooth dongle in order to connect my Bluetooth speakers (different brand) to my computer? Is this something possible at all? If so, I'd be happy if I could get a hint or some write-ups on that.
When I first got my diNovo Edge, I found and tried the solution here. Unfortunately, I also discovered that following these instructions locks the dongle in Bluetooth mode. That is, even when you power up your system, the dongle is in Bluetooth mode!
That presented a big problem for me, because I could no longer get into the BIOS! (Note: if anyone who sees this knows of a way to use the instructions here to put the dongle in Bluetooth mode and retain the ability to get into BIOS, please share it!)
The first, which is the one I use, is found here. This guy wrote a small program, called LHid2Hci, which works perfectly. All you do is download the binary and place a shortcut to it in your Startup folder. The binary takes two command line options, the VID&PID values of the Bluetooth dongle. (The instructions are all there.)
The program does exactly what the name says, it converts the Logitech Bluetooth dongle from HID (USB) to HCI (Bluetooth) mode! It's activated when you log in, and voil! You have your Bluetooth dongle, with which you can pair any other device. (I have a Microsoft Bluetooth number pad and a Bluetooth stereo headset.)
Are you sure the dongle is actually a Bluetooth dongle? Logitech is pretty big on their Unifying receivers, which are used to connect up to six Logitech devices using similar (but incompatible) technology to Bluetooth.
The diNovo mini definitely uses Bluetooth, so I was sure the USB dongle was a Bluetooth one. The included dongle has two modes that it operates in, an embedded mode and a Bluetooth mode. It's set to embedded mode by default, which allows you to connect to the Logitech device without having to do the pairing process. To switch it to Bluetooth mode you have to do the following:
You should try to pair your speakers with the dongle in the same way you have paired your keyboard and in the same way you have paired your speakers elsewhere. Have in mind that successful pairing may happen even if the dongle lacks support for required profile.
In case you never had to pair your keyboard with the dongle, there comes another issue: are you sure you've got a Bluetooth keyboard, not a simple wireless one? It's good if you are sure, but certainly there are users out there who do not know the difference, so let me explain for them.
As far as I know, vast majority of wireless keyboards and mice uses non-Bluetooth (vendor-specific, I think) protocols to communicate with their dongles. The reasons are: lower power consumption and simplicity. Such a set works "out of the box", the keyboard knows nothing about relatively complex Bluetooth, pairing, etc. The host may also know nothing about Bluetooth, and USB support is enough.
In addition, there isn't any need for two-way communication: the keyboard works as sender only, and the dongle as a receiver; still, Bluetooth requires two-way communication, even with a keyboard or mouse. That's why Bluetooth devices are more expensive than their non-Bluetooth counterparts.
Bluetooth or not, how can you tell? A Bluetooth keyboard should have a Bluetooth symbol on it and a button allowing it to pair with something other than attached dongle (example: with a laptop having internal Bluetooth adapter).
In fact, there isn't often any dongle in the set. The Bluetooth dongle reports to operating system as Bluetooth radio, while non-Bluetooth keyboard dongle is recognized directly as a keyboard (HID device) connected to USB just like any wired USB keyboard.
If your keyboard and dongle are Bluetooth devices, you have to pair them in every operating system you connect the dongle to, because a Bluetooth keyboard (and any other Bluetooth device) pairs with the operating system via the dongle, not with the dongle only. If given set works just by plugging the dongle, then it's not Bluetooth.
In case you cannot tell whether you've got Bluetooth or non-Bluetooth keyboard, name its model here, so we could figure it out. If it is Bluetooth one and you need more help pairing speakers, I need to know your operating system before I guide you further.
A superheterodyne receiver, often shortened to superhet, is a type of radio receiver that uses frequency mixing to convert a received signal to a fixed intermediate frequency (IF) which can be more conveniently processed than the original carrier frequency. It was invented by French radio engineer and radio manufacturer Lucien Lvy.[1][unreliable source?] Virtually all modern radio receivers use the superheterodyne principle.
Early Morse code radio broadcasts were produced using an alternator connected to a spark gap. The output signal was at a carrier frequency defined by the physical construction of the gap, modulated by the alternating current signal from the alternator. Since the output frequency of the alternator was generally in the audible range, this produces an audible amplitude modulated (AM) signal. Simple radio detectors filtered out the high-frequency carrier, leaving the modulation, which was passed on to the user's headphones as an audible signal of dots and dashes.
In 1904, Ernst Alexanderson introduced the Alexanderson alternator, a device that directly produced radio frequency output with higher power and much higher efficiency than the older spark gap systems. In contrast to the spark gap, however, the output from the alternator was a pure carrier wave at a selected frequency. When detected on existing receivers, the dots and dashes would normally be inaudible, or "supersonic". Due to the filtering effects of the receiver, these signals generally produced a click or thump, which were audible but made determining dots from dashes difficult.
In 1905, Canadian inventor Reginald Fessenden came up with the idea of using two Alexanderson alternators operating at closely spaced frequencies to broadcast two signals, instead of one. The receiver would then receive both signals, and as part of the detection process, only the beat frequency would exit the receiver. By selecting two carriers close enough that the beat frequency was audible, the resulting Morse code could once again be easily heard even in simple receivers. For instance, if the two alternators operated at frequencies 3 kHz apart, the output in the headphones would be dots or dashes of 3 kHz tone, making them easily audible.
Morse code was widely used in the early days of radio because it was both easy to produce and easy to receive. In contrast to voice broadcasts, the output of the amplifier didn't have to closely match the modulation of the original signal. As a result, any number of simple amplification systems could be used. One method used an interesting side-effect of early triode amplifier tubes. If both the plate (anode) and grid were connected to resonant circuits tuned to the same frequency and the stage gain was much higher than unity, stray capacitive coupling between the grid and the plate would cause the amplifier to go into oscillation.
In 1913, Edwin Howard Armstrong described a receiver system that used this effect to produce audible Morse code output using a single triode. The output of the amplifier taken at the anode was connected back to the input through a "tickler", causing feedback that drove input signals well beyond unity. This caused the output to oscillate at a chosen frequency with great amplification. When the original signal cut off at the end of the dot or dash, the oscillation decayed and the sound disappeared after a short delay.
Armstrong referred to this concept as a regenerative receiver, and it immediately became one of the most widely used systems of its era. Many radio systems of the 1920s were based on the regenerative principle, and it continued to be used in specialized roles into the 1940s, for instance in the IFF Mark II.
The regenerative system was highly non-linear, amplifying any signal above a certain threshold by a huge amount, sometimes so large it caused it to turn into a transmitter (which was the entire basis of the original IFF system). In RDF, the strength of the signal is used to determine the location of the transmitter, so one requires linear amplification to allow the strength of the original signal, often very weak, to be accurately measured.
To address this need, RDF systems of the era used triodes operating below unity. To get a usable signal from such a system, tens or even hundreds of triodes had to be used, connected together anode-to-grid. These amplifiers drew enormous amounts of power and required a team of maintenance engineers to keep them running. Nevertheless, the strategic value of direction finding on weak signals was so high that the British Admiralty felt the high cost was justified.
Although a number of researchers discovered the superheterodyne concept, filing patents only months apart (see below), American engineer Edwin Armstrong is often credited with the concept. He came across it while considering better ways to produce RDF receivers. He had concluded that moving to higher "short wave" frequencies would make RDF more useful and was looking for practical means to build a linear amplifier for these signals. At the time, short wave was anything above about 500 kHz, beyond any existing amplifier's capabilities.
It had been noticed that when a regenerative receiver went into oscillation, other nearby receivers would start picking up other stations as well. Armstrong (and others) eventually deduced that this was caused by a "supersonic heterodyne" between the station's carrier frequency and the regenerative receiver's oscillation frequency. When the first receiver began to oscillate at high outputs, its signal would flow back out through the antenna to be received on any nearby receiver. On that receiver, the two signals mixed just as they did in the original heterodyne concept, producing an output that is the difference in frequency between the two signals.
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