ART-6 through ART-11 "Jackal" Communications Jammers
This particular unit was one of a series of six jammers targeted against German tank radio traffic. With one exception (ART-11) they differed only in the frequency range covered by each transmitter.


T-34/ART-7 Jammer. Frequency range of this jammer was 27 to 34 MHz.

Its basic design was essentially that of a power "flip-flop" with tuned elements, using a pair of 35TG triodes, which means that its harmonic content was quite high...so much so that eventually an outboard filter was necessary to keep its output spectrum from interfering with other aircraft avionics (an F-15/U, made by a small company called Drake Engineering, that would ultimately become a great ham radio company). The frequency was swept back and forth through its frequency range by a ball bearing mounted capacitor driven by the cooling fan motor. The ART-11 differed from the rest of the series in that it had spare inductors mounted next to the motor, which could be paralleled with the sweeping capacitor to narrow its jamming band to any 2.5MHz segment within its basic frequency 48-75MHz range. The other jammers all swept their entire bandwidth of 6 to 8MHz, depending on the transmitter. The power output of this series was fairly high for jammers - 150 watts.

Frequency coverage for the five transmitters was as follows:
ART-6 - 20-28MHz
ART-7 - 27-34MHz
ART-8 - 32-38MHz
ART-9 - 37-43MHz
ART-10 - 42-48MHz
ART-11 - 48-75MHz



F-15/U harmonic filter. Notice its similarity to later TVI filters used by the ham radio community.

The power supply for all of this series was a similarly sized PP-35/ART, shown below. It used an unusual timed power switch to delay application of B+ until 60 seconds after the filaments were energized. One can hear the timer running when the switch it pushed up to "on".


PP-35/ART power supply

The antennas used with this series were a variety of fan and vertical stubs depending on frequency, using a matching network at the base of the antenna to minimize VSWR in the feedline coax. Shown below are two of these matching networks.


AB47 and CU-50 for ART-7.


AS-89 for ART-9

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