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IR sites are generally used for a small geographic area or to fill in holes. For sites that are used to fill in coverage traffic is very limited. To allow as limited a number of channels for use, and to be spectrum efficient, Voice On Control (VOC) was developed to permit the control channel to temporarily act as a voice channel. [ 1 ]
As with Adobe Acrobat, Nitro PDF Pro's reader is free; but unlike Adobe's free reader, Nitro's free reader allows PDF creation (via a virtual printer driver, or by specifying a filename in the reader's interface, or by drag-'n-drop of a file to Nitro PDF Reader's Windows desktop icon); Ghostscript not needed. PagePlus: Proprietary: No
Bullzip PDF Printer – there is a free version; CutePDF; DoPDF – this is a simplified version of NovaPDF; PDFCreator – a Ghostscript-based virtual printer for Microsoft Windows, with user interface for advanced options (security settings, combining multiple documents, etc.). PrimoPDF; Print To PDF - ships with Windows 10 and 11
Sumatra PDF is a free and open-source document viewer that supports many document formats including: Portable Document Format (PDF), Microsoft Compiled HTML Help (CHM), DjVu, EPUB, FictionBook (FB2), MOBI, PRC, Open XML Paper Specification (OpenXPS, OXPS, XPS), and Comic Book Archive file (CB7, CBR, CBT, CBZ). [3]
PDF-XChange Viewer (now superseded by the PDF-XChange Editor) is a freemium PDF reader for Microsoft Windows. It supports saving PDF forms and importing or exporting form data in FDF/XFDF format. Since version 2.5, there has been partial support for XFA, and exporting form data in XML Data Package (XDP) or XML format.
Javelin PDF Reader is a full functionality secure PDF reader for Windows, macOS, iOS/iPadOS (iPad and iPhone) and Android, with support for Digital Rights Management (DRM) using encoded and encrypted PDF files in Drumlin's DRMX and DRMZ formats. PDF files that have been converted to the DRMX and DRMZ formats (using the free DrumlinPublisher ...
WIRES uses DTMF signaling to make a connection over the Internet from a repeater or home station to another WIRES-equipped station that is accessible over the Internet. No proprietary tones or connection formats are used, so any manufacturer's radio (equipped with a DTMF encoding keypad) may be used to bring up the Internet link.
Okular is a free and open source multiplatform document viewer developed by the KDE community based on the Qt and KDE Frameworks libraries. It is distributed as part of the KDE Applications bundle. It replaced KPDF, its main predecessor, alongside KGhostView , KFax, KFaxview and KDVI in KDE 4.