JED - June 2016 - 44

SIG IN T

histor y

The Journal of Electronic Defense | June 2016

44

A general view of the ABC communications jammer operator's station in the radio room of a B-17 escort jammer. (Telecommunications Research
Establishment photo)

decided to hold Airborne Grocer over until the autumn of 1944. Unfortunately,
the Luftwaffe had almost completely
withdrawn FuG 202/212 from service in
western Europe by late 1944, and with
no target to jam, the Airborne Grocer
program was shelved without ever having been used operationally. The removal of Airborne Grocer also meant that the
RAF's jamming B-17s never really had to
make use of the type's altitude capabilities and were always flown within the
bomber streams in order to benefit from
the protection of the Window (chaff)
clouds generated by such formations.
For its part, Jostle IV finally became
operational on July 4/5, 1944 (despite
its appearance being deemed a "matter of real urgency"), while even the

acquisition of the required B-17s was
subject to "considerable delay." In the
end, the unit selected to operate the
new jamming platforms (No. 214 (Federated Malay States) Squadron) began
forming at RAF Sculthorpe in Norfolk
in late December 1943, with its aircraft
arriving before any of the specified jamming gear had become available. Here,
both Airborne Grocer and Jostle IV are reported to have been the victims of "all
sorts of difficulties, both in design and
manufacture," with the various problems being primarily due to "the purely
engineering problems which arose by
reason of the ambitious nature of the
[escort jammer] project."
While the foregoing might explain
the difficult gestation of the RAF's B-17

jammer program, it did not help a situation where aircraft were becoming available without the jamming equipment to
put in them.
That this was understood early on is
evidenced by the appearance in January 1944 of an "interim RCM fit" for use
aboard six aircraft. Here, the "interim
fit" centered on the Airborne Cigar (ABC)
communications jammer in place of the
desired Jostle IV. The ABC was used to
disrupt the enemy's 30- to 31-MHz and
(later) 38- to 42-MHz communications
channels until the following July. Elsewhere, a small number of aircraft were
fitted with the Mandrel radar jammer
during July and August 1944, and the
type's "main" fit was finally established
as comprising Jostle IV, provision for



JED - June 2016

Table of Contents for the Digital Edition of JED - June 2016

The View From Here
Conferences Calendar
Courses Calendar
From the President
The Monitor
Washington Report
World Report
Advances in COMINT/ DF Systems
Technology Survey: Communications and IED Jammers
SIGINT History
EW 101
Report from the 45th Annual Collaborative EW Symposium
AOC News
2016 AOC International Election Guide
Index of Advertisers
JED Quick Look
JED - June 2016 - cover1
JED - June 2016 - cover2
JED - June 2016 - 3
JED - June 2016 - 4
JED - June 2016 - 5
JED - June 2016 - The View From Here
JED - June 2016 - 7
JED - June 2016 - Conferences Calendar
JED - June 2016 - 9
JED - June 2016 - Courses Calendar
JED - June 2016 - 11
JED - June 2016 - From the President
JED - June 2016 - 13
JED - June 2016 - 14
JED - June 2016 - The Monitor
JED - June 2016 - 16
JED - June 2016 - 17
JED - June 2016 - 18
JED - June 2016 - 19
JED - June 2016 - 20
JED - June 2016 - 21
JED - June 2016 - Washington Report
JED - June 2016 - 23
JED - June 2016 - World Report
JED - June 2016 - 25
JED - June 2016 - Advances in COMINT/ DF Systems
JED - June 2016 - 27
JED - June 2016 - 28
JED - June 2016 - 29
JED - June 2016 - 30
JED - June 2016 - 31
JED - June 2016 - 32
JED - June 2016 - Technology Survey: Communications and IED Jammers
JED - June 2016 - 34
JED - June 2016 - 35
JED - June 2016 - 36
JED - June 2016 - 37
JED - June 2016 - 38
JED - June 2016 - 39
JED - June 2016 - 40
JED - June 2016 - 41
JED - June 2016 - 42
JED - June 2016 - SIGINT History
JED - June 2016 - 44
JED - June 2016 - 45
JED - June 2016 - EW 101
JED - June 2016 - 47
JED - June 2016 - Report from the 45th Annual Collaborative EW Symposium
JED - June 2016 - 49
JED - June 2016 - AOC News
JED - June 2016 - 2016 AOC International Election Guide
JED - June 2016 - 52
JED - June 2016 - 53
JED - June 2016 - 54
JED - June 2016 - 55
JED - June 2016 - 56
JED - June 2016 - Index of Advertisers
JED - June 2016 - JED Quick Look
JED - June 2016 - cover3
JED - June 2016 - cover4
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