contd cwtrx ideas, buttons

scratch.md

@@ -1,16 +1,56 @@
 # scratchpad: ideas, notes etc
 
-## portable 70cm cw
+## CWTRX
 
-low-power cw transceiver
+low-power portable (70cm) transceiver for short range CW contacts
 
-- 432000..432400 kHz (?)
-- headphone jack, loudspeaker optional (low sound quality ok)
-- direct keying, elbug circuit optional (mechanical switch)
-- working on 5..12 V, optimized for 5 V (USB)
-- output pwr: min 0.1 W, optional 0.5 and 2 W
-- LCD display with mechanical backlight switch (?)
-- mechanical off/volume knob
-- direct conversion or BFO (mechanical/electronic 100 Hz steps)
-- power save mode 100/30/10/3% with variable squelch (trimmer?)
+### general features
+
+- supply 5..12 V, optimized for 5 V (USB)
+- power save mode with variable squelch (trimmer?)
 - beacon mode: call sign transmission unless squelch open, pause
+
+### RF section
+
+- at least 432000..432400 kHz, up to 438000 if possible
+- range limits settable for manual and automatic scans
+- antenna: socket? headphone cable? key cable?
+- TX: min 0.1 W, optional 0.5 and 2 W
+- RX: direct conversion or BFO (mechanical/electronic 100 Hz steps)
+
+### user interface
+
+- mechanical off/volume knob
+- buttons: MENU, ESC, ENTER, +, -, A, Z, (RESET)
+- output by side tone, Morse code
+- headphone jack, loudspeaker optional (low sound quality ok)
+- direct keying, elbug optional (selected by plug type)
+
+#### button functions outside of settings
+
+button press generates side tone, higher pitch when long
+
+- MENU: settings (short), default store (long)
+- ESC: status report (short), default recall (long)
+- ENTER: transmit key
+- +, -: freq change (increasing step size when long press, indicated by increasing side tone pitch)
+- A, Z: memory recall (short), memory store (long)
+- (RESET): hidden button, factory defaults
+
+status report: RX/TX freq (kHz abbreviated in range limits)
+
+#### settings
+
+- while in settings, short beep every 2 sec
+- acknowledge by
+
+##### buttons
+
+- MENU: tell current item (short), store and exit (long)
+- ESC: leave current menu (short), abandon and exit (long)
+- +, -: change
+- ENTER: select current item
+- A: yes/set/all/max.value
+- Z: no/clear/zero/min.value
+
+---