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FM radio NAT138

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Hi all,


I am looking for some help regarding the NAT npx 138.

I guess nat sold to cobham, can't get ahold of anyone.  No surprise there. 


We got 1 neediness in our fleet the that radio,  but it has no guard channels... how do we unlock that feature? Anyone has an idea or a number or name to contact?


Much appreciated


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I came across a similar issue when trying to program guard frequencies into an old NPX 138 unit - from what I recall, I think it depends on which exact model / version you have installed as one of them only has a couple of fixed guard frequencies for the US Forestry Service while the other can be fully programmed.

A link to the manual is shown below - section 3.4.4 / pg. 3-4 has some details.




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