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dBu = 20 log V/0.775 where voltage is irrespective of impedance
dBm = 20 log V/0.775 where voltage is measured across 600 ohms
dBV = 20 log V/1
Wizened and greying broadcast engineers who remember valves the first time round will also be aware that the spacing between scale marks 1 and 2 on a PPM used to be 6dB. Proud possessors of ancient BBC MNA/3, ATM/1, TPM/3 and PPM/6's will still only accept this scaling. However, since the introduction of (modern?) transistorised PPM drive cards, the spacing between scale marks 1 and 2 is 4dB.
Source: BBC Designs Department Handbook No. 3.186 (1976).
A handy tool for calculating what size cable drum you require.
Filtered or Unfiltered? IECs or Powercons? Grey with green LEDs or black with red LEDs? With so many options available the task of choosing the right mains distribution unit can be tough one. That's why we've produced a handy tool to help you make the right decision.
A handy tool to for quickly finding a populated connection panel that meets your requirements.
A handy tool to for quickly finding a populated fibre connection panel that meets your requirements.
A handy tool to for quickly finding an unpopulated connection panel that meets your requirements.
A handy tool to for quickly finding a rack blanking plate that meets your requirements.
How did we arrive at today's typical values for cable impedances and what values will be suitable going forward?
These colour codes are offered as guidance in allocating circuits and investigating existing installations.
What properties are required of a cable to make it suitable for both analogue and digital signals?
The following tables are intended to aid cable selection by showing applications and specifications of the cables in the catalogue.
Dr. John Emmett discusses the characteristics a cable needs for use in high-performance digital video applications.
Information on Canford cable conformance to BS EN fire safety specifications and a quick reference table showing the level of conformance granted by the various acronyms employed by manufacturers when describing low fire hazard cable.
Table showing a comparison of the maximum rated transmission distances for the various types of Digital Video cables.
Table showing a comparison of the maximum rated transmission distances for the various types of fibre ethernet cables.
This table gives closest equivalent size cross references between metric and American wire sizes.
Designed originally as a tightly specified co-axial connector for low power RF applications, the BNC has become the connector of preference for many communications, video and, until recently, computer network installations.
Explanation of BNC connector terminology and termination options.
This table cross references many popular cable types against their appropriate cable group to aid the selection of an appropriate co-axial connector.
This chart relates the correct crimping die-set (to fit Erma crimp tool, see stock codes 55-800-810), to suit various RF connectors Stocked by Canford, to cable 'groups' (see Co-axial connectors selection guidance).
Many 8 channel Digital Tape Recorders are wired to this standard. To simplify connection to other equipment Canford stock a range of ready made 25pin D-Sub Breakout Cables wired to the Tascam DTRS standard.
Diagrams representing the arrangement of contacts in jack sockets
Clarification of the various colour code standards for wiring RJ45 connectors.
This chart should be used as a guide for telephone socket adapter type data.
A brief history of the SCART connector and it's adaption for modern day professional applications by Dr John Emmett of Broadcast Projects Research.
Wiring conventions for DC power on XLR 4-pin connectors.
19" rack equipment dimensional data as specified by BS5954 (1980) and IEC 297 (1975).
Single and double gang electrical plate dimensions.
Some notes on Canford's implementation of the "Batteries and Accumulators and Waste Batteries and Accumulators Directive" (2006/66/EC).
Fibre installation and patching convention according to ISO/IEC 11801.
Comparison chart of dB-dBu-dBV
The Subject of CE marking has been fraught with partial understanding and confusion. We felt a brief outline of what is a complicated political, legal, commercial and technical subject might help clarify matters for our customers.
This technical briefing was written specially for
Canford by acoustics consultant Tony Woolf, who specialises in design of broadcast and recording studios, and in hearing
protection for musicians and the professional audio industry.
The four most common methods for wiring stereo headphones.
The protection of enclosures against ingress of particles or against ingress of water is defined in IEC529 (BVSEN60529:1991).
Information about the Control of Noise at Work Regulations and the use of headphone limiters in the workplace.
Information on the Digital Switchover and the phasing out of channel 69 as a licensed frequency for use in Radiomics.
Four mysterious terms you never to dared ask, but always wondered about?
The following information should be used as a guide when choosing radio microphones.
Link to the Canford RoHS & WEEE reference page providing you with the latest information on Canford's implementation of the RoHS and WEEE directives.
Canford Audio Limited is registered in England and WalesCompany registration no: 1385727VAT no: GB 660116371