[MRCA] Commo #4 MX-6707

[B. Smith]

You can modify the round tuning unit for high  VHF by picking a band 
segment and removing coils. Best to use a Dip Meter.
Z

On 6/5/2024 6:52 PM, MilComm Guy wrote:
> I received a comment about the high failure rate of the round tuning 
> units and he is correct, the military did a study on how to try and 
> correct this.
>
> https://apps.dtic.mil/sti/tr/pdf/ADA118281.pdf
>
> Leaving the antenna tied down opens the spring coils and allows water 
> in, also the plastic version develops cracks where water can get in.  
> When looking to buy one check for cracks and make sure the manual 
> tuning knob on the bottom turns freely, if not pass on it.
>
> The MX-2799 tuning unit has the spring base mounted separate from the 
> tuning unit allowing more flexibility of where you can mount the tuner 
> and still have the antenna vertical and no chance of water entry from 
> a tied down antenna.
> DSCN0447.JPG
> DSCN0445.JPG
>
> Mark
> K1HF
>
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