Bell-powered Posted June 24, 2022 Report Share Posted June 24, 2022 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 //M Quote Link to comment Share on other sites More sharing options...
heli_sdw Posted June 24, 2022 Report Share Posted June 24, 2022 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. https://fccid.io/ANATEL/00008-11-05941/Manual-NPX138/51B942D4-1D07-4E8D-A11A-557BEA5155AA/PDF Quote Link to comment Share on other sites More sharing options...
Saifan Pilot Posted June 25, 2022 Report Share Posted June 25, 2022 The guard controls are functional only in radios with the optional guard receiver installed. Quote Link to comment Share on other sites More sharing options...
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