Wireless Keyboards - 2.4ghz vs 27mhz
Cherry’s wireless keyboard and mouse sets come in two different versions and this can affect the way in which they operate.
27mhz radio frequency is used in more Cherry products than any other:
Sirius - M82-24700GB, Control - M82-24710GB, Barracuda - M85-25700GB, Stingray - M85-25710GB, Liberty - M-5650
The frequency allows connection distances of up to 2m, but can be a little further, dependent upon the conditions in which the device is used - this can be up to 5 or 6 (as we’ve found from experience!). However, within 27mhz there are some limitations as to the number of devices that can be present in a small location. This can then cause some difficulties with interference between devices, even when the ‘connection procedure’ is followed to attempt attachment to a different channel ID.
The connection procedure for Cherry 27mhz devices is simple. Once the batteries are installed, the receiver should be connected to a free USB port on the PC. When connected, the keyboard and mouse may well automatically function, but in case of any problems, there is a ‘Connect’ button on the receiver, as well as one underneath the keyboard and mouse. The connect button on the receiver should be depressed for a couple of seconds, followed by the one under the mouse, then the one under the keyboard and the devices should be connected.
With 2.4ghz devices, the range is far greater - 10m - as standard, though again, dependent upon conditions, this may increase. 2.4ghz is found in the following devices:
Marlin - M85-25800GB, Mover - M-200S, Ergo Shark R - M-200R, Ergo Shark L - M-200L
These devices are all ‘pre-coded’ with their receivers, making sure that there is no cross interference between devices. The only down-side to this, is that if the receiver, keyboard or mouse fails, the entire set would have to be replaced. However, as these are Cherry devices, this is extremely rare!
This entry was posted on Tuesday, January 29th, 2008 at 3:17 pm and is filed under Wireless Keyboard. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.
On your 2.4Ghz systems you could use a different method of binding (pairing) the devices so replacements or changes in addresses could be accomplished. Many devices using the Nordic Semiconductor chipset utiltizes Both Dynamic and Static pairing. http://www.nordicsemi.com
Thanks,
Jay
Hi,
Thankls for the info, I’m pretty sure that my colleagues in Germany, who are basically the designers of the products, would be familiar with the technologies involved, but for reasons unknown to me at this time, have chosen to go down the route of 2.4ghz devices which don’t have changeable properties. Previously with some older devices, we did have DIP switches, which could change the ID of the devices used, but this was to ensure that there was no cross interference, which is resolved with the individual channel selection in these new devices.
We’re obviously not sure whether anything will change with future products appearing, but we’ll obviously keep an eye on the products to see if there is any requirement for moving technologies.
Hope this is okay!
Robin.