The Story About The TG-56 Microphone
Due to the poor audio quality of the RK microphone, it became necessary to find an alternative noise canceling mic for
trucking. Even though the new rigs are quieter, there is still a lot of background noise in these trucks. Most stock mics
don’t have good voice reproductive qualities. While a minority do sound good, they all pick up background noise with little
or no reduction in background noise.
This background noise can and does interfere with communications making it difficult for operators on the other end
straining to decipher what they are hearing. Not a good thing in an emergency situation or Smokey report. There are
some RK knock-offs, which now sound better than the current RK production, however they lack a quality switch, mic
plug, and wiring.
We as well as other shops found the RCI SRA-198 as the closest replacement to the old Telex/Turner RK-56 and the
Astatic 636L second to that (also owned by the company that currently owns RK. Although the 636L sounds good, the
cords have changed and don’t retain the curl and stretch out. The new RK is just Turner RK-56. The search started again
once the SRA-198 supply started to shrink.
We found a manufacturer that made a good sounding mic with good noise canceling quality and had it modified to our
specifications. It has a high quality switch, plug and reinforced wiring. While the noise canceling isn’t quite as good as the
SRA-198, the audio quality is fuller and closer the the old RK.
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