This Modification will allow the use of the SWR Cal Control (or an added 10K potentimeter) as a Variable RF output control and still allow proper operation of the SWR Cal Control.

Radio Modification Information Page
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President or Uniden HR-2600 Variable Power Modification
The HR-2600 does not have a varible output power feature as it comes from the manufacturer. The following modification will allow you to fix that oversight. This Mod will vary the power on AM.