SQ-RR - STARQUAD MICROPHONE CABLE Polyethylene jacketed, reinforced - Rodent resistant
For some years, Canford has manufactured a 'sheep resistant' video cable, SDV-L-SR, developed for specialist applications such as RSPB nest security monitoring and BBC's Springwatch, where video cables are laid in the autumn up to 'nest-cams', and other remote locations. Based on this experience, a version of the standard Starquad mic cable, SQ-SR, has now been developed for similar applications. However, even this, although resistant to most animal teeth, is vulnerable to damage from rats and other rodents.
This special 'rodent resistant' version of the cable is based on SQ-SR, but then has a glass fibre tape layer and an outer polyethylene jacket. This isn't fully 'rodent-proof' (steel wire armour or metal tube is needed for that - a very expensive technique) but offers a high level of protection as rats don't like the glass splinters that occur when they chew.
The additional protection of the cable created by the extra layers makes the cable suitable for some direct burial applications. Polyethylene has a considerably greater resistance to water, and whilst not suitable for permanent immersion, provides a high level of protection.
Designed for the transmission of sound through noisy areas the balanced quad cable is used as a twisted pair with capacitance unbalance characteristics designed to cancel out the worst kind of interference - external noise. To achieve this, four insulated conductors are twisted together with a very short lay-length, the insulation thickness on each conductor being closely controlled to match capacitance as closely as possible.
Technical Specification:
| BBC Specification: |
Cores and screen similar to PSF4/1M |
| Conductors: |
1/0.53mm (0.22mm sq.) tinned copper wire |
| Insulation: |
PVC, O.D. 1.10mm, red, green, blue, white |
| Lay up: |
Four wires twisted together with lay length 13.0mm |
| Screen: |
48/0.15mm tinned copper wire, helically wound |
| Inner jacket: |
PVC, 4.6mm OD, black |
| RR construction: |
Woven glass tape applied longitudinally between the inner and outer jackets |
| Outer jacket: |
High density polyethylene, OD 7.3mm, black |
| Weight: |
5.5kg/100m |
| Reel lengths: |
500m |
| Cut lengths: |
Available in any multiple of 1 metre |
| Usage note: |
Red + Blue for A leg |
| |
Green + White for B leg |