Hamlib/doc

Quirks, known bugs, and other notes.
====================================

$Id: README.ft920,v 1.1 2002-11-23 14:09:19 n0nb Exp $

In this document I'll try to describe the behavior of the Yaesu FT-920
transceiver with Hamlib.  Some of these are limitations of the radio
while others are programming trade-offs with Hamlib.

This document is organized by Hamlib function calls and documents observed
behavior with each call.

rig_set_mode
    *   If radio is in MEM or MEM TUNE state, main display mode can be 
        changed when RIG_VFO_CURR is passed.  
    *   Modes DATA USB and DATA FM cannot be set at this time 
        (Hamlib limitation).  See below.

rig_get_mode
    *   Modes DATA USB and DATA FM cannot be returned as rig.h only has
        RIG_MODE_RTTY (Hamlib limitation).
    *   DATA LSB is mapped to RIG_MODE_RTTY.
        
rig_set_freq
    *   If radio is in MEM or MEM TUNE state, main display freq can be 
        changed when RIG_VFO_CURR is passed.  
    *   RIG_TARGETABLE_ALL is properly handled (I think).

rig_set_vfo
    *   When called with RIG_VFO_A, the radio appears to do nothing, 
        however, rig_state->current_vfo will be updated.  
    *   When called with RIG_VFO_B, the radio will swap the main and sub 
        displays, the same as if the front panel A<>B button is pressed.
    *   No provision exists to make VFO-B (sub display) the active RX
        through CAT.

rig_get_split
    *   Both split capabilities are tested, i.e. RX A/TX B and RX B/TX A,
        but Hamlib only supports an indication that the radio is split.
    *   The VFO value passed is not used by the ft920 backend lib.
        
rig_set_split
    *   When called with RIG_SPLIT_OFF the radio will make TX A active if
        TX B was active, otherwise no change.
    *   When called with RIG_SPLIT_ON the radio will make TX B active if
        TX A was active, otherwise no change.
    *   The FT-920 has no capability to change the active RX to RX B (sub
        display) through CAT.  Thus if VFO-B is active RX/TX the setting
        RIG_SPLIT_ON will make no visible change on the radio.  
    *   The VFO value passed is not used by the ft920 backend lib.
    
General notes.
    As with most all Yaesu radios the radio must be polled by the application
    for status updates, i.e. no transceive mode in CAT.