No - not the same VOCODER. IMBE is a VOCODER. VSELP is a VOCODER - different from and incompatible with IMBE.
Early Motorola digital radios were sold with Motorola's Astro proprietary digital voice format which uses the VSELP VOCODER. After APCO released the P25 standard using the IMBE VOCODER, Motorola offered that as well. Both were available for a period of time. Subseqently, Motorola has discontinued their original format. In Motorola terms: Astro = 9600 BPS C4FM digital voice using the VSELP VOCODER. Astro25 = 9600 BPS C4FM digital voice meeting the P25 standard and using the IMBE VOCODER. Purchasers of used Motorola digital radios [Astro Spectra, Astro Saber, and XTS3000] must be careful that the radio they are buying has the features and VOCODER they want. Newer Motorola digital radios [marketed as Astro25 products] such as the XTS5000 and XTL 5000 were never sold with the old Motorola VSELP Astro format. As to whether Motorola Astro VSELP can be used on the ham bands - it is simply a digital voice format with no intent to obscure content, so it probably would be OK, but why would you want to utilize a dead format? ------------------------------------------------------------------- --- In [email protected], Dan Blasberg <[EMAIL PROTECTED]> wrote: "Since when isn't VSLEP allowed on the ham bands?? It is IMBE just a different scheme using the same vocoder."
