[MRCA] GRC-106 Whip Prep

[B. Smith]

  A loading coil in the center gives better current distribution. Also 
you can tap it for different bands.Insulator is hard rubber from 
plumbing supply at local home store. Terminals are soldered.
Z


On 7/19/2023 1:32 PM, MilComm Guy wrote:
> I spent some time today getting the whip antenna prepped for use on 
> the GRC-142 shelter at the Weare NH rally. Often these antenna base 
> assemblies get left out in the weather, they are not built to be left 
> out and last very long, the rubber and steel components degrade with 
> sun and water exposure.
>
> If you are lucky the top and bottom should unscrew by hand, inside the 
> bottom cup is a plastic nut and washer, be careful to over tighten 
> when you reassemble.  A bore brush, drill and a 3/8 tap make the work 
> much easier.  Use your favorite grease and assemble.  The mast 
> sections are copper plated steel and the copper plating is very thin, 
> be careful when buffing them clean not to overdo it, these mast 
> sections are very expensive now, very light coat of grease on the 
> threads here too.  I cover them with a plastic bag to keep the dirt 
> off/out on both ends.
>
> I am also attaching an article on how to improve the GRC-106 whip in 
> the field.  I know a wire antenna is ideal, but oftentimes in a 
> cramped static location such as a show the whip is necessary.
> https://radionerds.com/images/c/c5/Army_communicator_Sept_1984_AN-GRC-106.pdf
> DSCN0209.JPG
> DSCN0210.JPG
>
> Mark
> K1HF
>
>
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