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Selectone st-25B rolling code voice encryption modules
ST-25B/C ROLLING CODE VOICE ENCRYPTION MODULEST-25B/C ( you get two units, one for each radio for one low price)
The Clear/Cipher select line is the only user control. Receive mode is automatic, so that clear speech or encrypted speech with the proper code key will be received regardless of the mode selected. Once installed, the ST-25B/C can be enabled or disabled as required. Therefore, it is not necessary to equip an entire fleet with encryption, but only those units where high voice security is required.
Special factory set master code keys may be reserved to provide extra security for special applications. Each master code key group has over 268 million possible code keys. User selectable code keys and other operating parameters are field programmable with a PC using the ST-25PM Product Manager Software.
The standard model for most applications is the ST-25B. The ST-25C is identical but provides a low pass filter in parallel to the normal receive audio path. This path is used for special applications where CTCSS detection must occur after the application point in the host radio. Radios which require the use of the ST-25C are listed above (same as ST-20C).
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