Independent specialists since 1984 

	What is CTCSS and DCS?
ORDER BY PHONE: 01433 651013 9:00am - 5:30pm 7 days Hope Road, Bamford, Hope Valley, Derbyshire, S33 0AH, UK. Main Menu > MISCELLANEOUS > Two Way Radios > PMR446 Two Way Radios > ABOUT PMR446 TWO WAY RADIO > What is CTCSS and DCS? What is CTCSS and DCS? Because PMR446 radios are limited to 8 frequencies (channels) interference from other people outside your group could be a problem, especially in highly populated areas. However, a system was devised to enable groups of radios to be set to a "group code" by the user which would block signals from radios using a different code, even if they were on the same frequency. There are two ways this is done.... CTCSS (Continuous Tone Coded Squelch System) The transmitting radio sends a tone along with the main signal. Radios set to a different code will effectively ignore the signal by keeping the squelch* closed. Radios set to the same code will open the squelch upon reception allowing the transmission to be heard. There are 38 different CTCSS codes. These combined with the 8 available channels mean that CTCSS enabled radios have only a 1 in 304 chance of having the same setting as a another group. DCS (Digitally Coded Squelch). These work in a similar way to CTCSS codes but use a digital signal. DCS enabled radios are usually CTCSS enabled as well giving a total of 121 "group codes" increasing the total number of channel / code combinations to 968. *Squelch Without squelch you would continually hear the hiss of background interference. Squelch silences this by shutting down the audio circuit in the radio. If a signal is received which is stronger than the background interference the audio circuit is activated allowing that signal to be heard. CTCSS and DCS extends the function of Squelch to block unwanted signals as well as background interference.

PRODUCT AVAILABILITY: We source many of our products from very small manufacturers who don't have registered bar codes. Although technically possible it is impractical for us to operate an automated stock control system. We would be working for the machine rather than the machine working for us and there aren't enough hours in the day to do it. However, it is rare for us to be out of stock of anything and we do our best keep our site updated accordingly. If we know we're out of stock of something we remove the "add" button or put a note against the item. In the rare event we sell out of something between web site updates or we miss something, we would let you know, giving you the choice of keeping the item on order or cancelling. If you would like to check availability of an item prior to ordering either give us a call or drop us a line by email. E: info@hitchnhike.co.uk

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WHO ARE WE? We are an independent specialist company based in Bamford, Derbyshire and we've been trading for 28 years. We are a family firm and all our staff are long term. If you don't know us and are worried about buying over the Internet from a company you've never heard of type "Hitch n Hike" into Google and check us out, or just give us a call.

HIGHLANDS & ISLANDS: Some remote areas and islands may be subject to additional delivery costs, requirements or restraints, depending on the size and weight of the item ordered. If you place an order and this is the case we would contact you to discuss options / additional costs. We will always do our best to find a way but if we can't we may have to cancel the order. If you'd like us to check first just give us a call.

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