|This version is not very well tested and may have some errors.
|Some bugs fixed: Menu settings can be switched on and off now; volume does not toggle the handset speaker; all 3 transmit power levels work.
|Some bugs fixed: Memory and VFO-settings are correct after power-on;
correct behaviour in the "save to nr?" dialog.
New features: Large key is PTT; "B"-key is call tone; "A"-key is save to memory; seven repeater shifts selectable; handset speaker works with squelch.
|Bugfix: External PTT does not activate call-tone
|power-on-message "Amateur UHF", repeater shift is shown in main display
|Bugfix: no crash on intel-CPUs
New features: #-key changes repeater shift, D-key toggles between memory- and vfo-mode; additional 2.0 MHz repeater shift; info can be aborted with any key
|New feature: Automatic power-off-timer shuts down approx 10 hours after last action. This feature can be disabled with menu setting.
check band borders when operating with repeater shift
The PLL must be able to lock in a range of 20 MHz (10 MHz transceiver tuning range plus 10 MHz TX/RX offset). With an additional capacitor 3.3 pF or 3.9 pF in parallel to C 603 the PLL should lock in the whole range. To avoid auto-turn-off after 30 seconds of transmitting, add a resistor 5.6 kOhms in parallel to C101 (10 uF) in CF6002. Some control logic boards (CL6002) make problems to turn on the radio. Try a capacitor 22 nF from pin 1 to pin 20 of the U908 or U909 (74HC374). The call tone frequency is 1800 Hz with the original 1.008 MHz xtal at the FX 409. To change the frequency to 1750 Hz, replace this xtal by a 680 mH coil. To get the exact frequency, add some pF's in parallel to C910.
Cancels the squelch, loudspeaker symbol blinks
Up / Down arrow
Adjust the volume in 15 steps
One press gives a step down in frequency, if you keep the button pressed for more than 3 sec it will step down in frequency until it has reached 430.000Mhz or the button is released.
One press gives a step up in frequency, if you keep the button pressed for more than 3 sec it will step up in frequency until it has reached 439.9875 Mhz or the button is released.
This button is used to select between 3 output power levels. in the right hand side of the display is l for low power m for medium and h for hi (0.5w, 1.5w or 15w) or whatever you have adjusted r109,r103 and r111 for.
Scan function of the whole band or (10 memorised channels) the radio will stop with carrier detect and will continue when the carrier disappears.
Changes the repeater shift 1.6 2.0 7.6 9.4 MHz positive or negative and 0 simplex
Saves VFO settings into one of the ten memory channels
The call tone frequency is 1800 Hz with the original 1.008 MHz xtal at the FX 409. To change the frequency to 1750 Hz, replace this xtal by a 680 mH coil. To get the exact frequency, add some pF's in parallel to C910.
is the confirmation key to write an memory channel
D-key toggles between memory- and vfo-mode;
Large key on handset is PTT
PTT, on TX the red triangular symbol little key will lit
Two small keys on handset change the handset volume
Access, and scroll the menu, scroll to the end or press CL to exit. Menu only works in vfo mode.
Use FLAG to change a menu item
In the menu are the following items:
-microphone on , off
-handsfree on,off activate pre emphaser
-speaker : loudspeaker on,off
-handset mic on,off
-handset spk : activate the handset loudspeaker the AF is not squelched
-clear all: with D-key, all memorys are set to default settings
-keyb light : keyboard light
-info: shows an message with version number
-start beep : power on beep
-key beep : keypad beep
-auto off: automatic power off 10 hours after last action
The radio can be used in two ways, either in VFO mode or in MR memory
VFO mode : Here you can enter frequencies in 12.5/25khz step "Flag/|" can be used to change the frequency.
MR memory mode : Here you will have a digit (0-9) in the left side of the display indicating the actual channel. You can change the channel using the numerical keypad or "Flag/|"
Memory input :
1. Press "D" for VFO mode
2. Choose frequency, output power, repeater spacing.
3. Press "A" the display shows "SAVE TO NR? 1"
4. Now you can choose the memory position you want to save in.
5. Press "C" to actually save the data in that position,
The radio has an incorporated field strength indicator, the 3 LED’s to the left of the display. The squelch opens on the first LED, and can be adjusted with R711; all 3 LED’s are lit with max signal strength.
MS Mic has an impedance of 600 Ohms, and has a DC voltage output of
LS 1/ LS 2 is the loudspeaker output in 4 Ohms, 10W.
RX / TX Line can be used with an external modem as Storno says, but
they also talk about a 10Hz to 3KHz +/- 3dB frequency response.
It is probably a good idea to use all the pins for the power connection, otherwise it can get a bit hot drawing 6A through 1 pin.