Editing Avro Vulcan (section)

===Avionics===
The original Vulcan B.1 radio fit was: two 10-channel [[Very high frequency|VHF]] transmitter/receivers (TR-1985/TR-1986) and an STR-18, 24-channel [[High frequency|HF]] transmitter-receiver (R4187/T4188).<ref name='Wynn137'>Wynn 1997, p. 137.</ref> The Vulcan B.1A also featured a [[Ultra high frequency|UHF]] transmitter-receiver (ARC-52).<ref name="PilotNotes" /> The initial B.2 radio fit was similar to the B.1A<ref name='PB&E112'>Price, Blackman and Edmonson 2010, p. 112.</ref> though it was ultimately fitted with the ARC-52, a V/UHF transmitter/receiver (PTR-175), and a [[single-sideband modulation]] [[High frequency|HF]] transmitter-receiver ([[Rockwell Collins|Collins]] 618T).<ref>''Aircrew Manual'' pt. 1, ch. 14, paras. 1–12.</ref>

The navigation and bombing system  comprised an [[H2S radar|H2S Mk9 radar]] and a navigation bombing computer Mk1.<ref name='Wynn137'/> Other navigation aids included a [[Marconi Company|Marconi]] radio compass ([[Radio direction finder#Automatic direction finder (ADF)|ADF]]), [[GEE (navigation)|GEE Mk3]], [[Green Satin radar|Green Satin]] [[Doppler radar]] to determine the [[groundspeed]] and [[Wind triangle|drift angle]], [[Radio altimeter|radio and radar altimeters]], and an [[instrument landing system]].<ref name='Wynn137'/> [[TACAN]] replaced GEE in the B.1A<ref>''Pilot's Notes'' pt. 1, ch. 16, para. 11.</ref> and B.2 in 1964. [[Decca Radar|Decca]] Doppler 72 replaced Green Satin in the B.2 around 1969<ref name='PB&E102/3'>Price, Blackman and Edmonson 2010, pp. 102, 103.</ref> A continuous display of the aircraft's position was maintained by a ground position indicator.<ref name='PB&E102/3'/>

Vulcan B.2s were eventually fitted with the free-running [[Gyroscopes|dual-gyroscopic]] heading reference system (HRS) Mk.2, based upon the [[Inertial navigation system|inertial platform]] of the Blue Steel missile, which had been integrated into the system when the missile had been carried.<ref name='PB&E102/3'/> With the HRS a navigator's heading unit was provided, which enabled the navigator plotter to adjust the aircraft heading, through the autopilot, by as little as 0.1 degrees. The B.2 (MRR) was additionally fitted with the [[LORAN]] C navigation system.<ref name="Brookes83"/>

The original ECM fit of the B.1A and B.2 was one Green Palm voice communications jammer; two Blue Diver metric jammers; three [[Red Shrimp]] S-band jammers; a Blue Saga [[Radar warning receiver|passive warning receiver]] with four aerials; a [[Red Steer]] [[tail warning radar]]; and [[Chaff (countermeasure)|chaff]] dispensers.<ref name='Wynn321'>Wynn 1997, p. 321.</ref> The bulk of the equipment was carried in a large, extended tail cone, and a flat ECM aerial counterpoise plate was mounted between the starboard tailpipes.<ref name='Wynn151'>Wynn 1997, p. 151.</ref>{{refn|Some B.2 aircraft armed with Blue Steel had an additional aerial plate fitted between the port tailpipes as the Blue Steel fin, in the lowered position, blanked signals from the starboard side.<ref name='bulman153'>Bulman 2001, p. 153.</ref>|group=N}} Later equipment on the B.2 included: an [[L band]] jammer (replacing a Red Shrimp); the ARI 18146 X-band jammer;<ref name='PB&E106'>Price, Blackman and Edmonson 2010, p. 106.</ref> replacing the Green Palm; the improved Red Steer Mk.2; [[Flare (countermeasure)|infra-red decoys]] (flares); and the ARI 18228 PWR with its aerials that gave a squared top to the fin.<ref name='PB&E112'/><ref name='brookes57'>Brookes and Davey 2009, p. 57.</ref>