Modifications for the Yaesu
FT-411
19-07-1998 MODS for FT-411/811 TRX for a VHF
UHF
To allow this TRX for a VHF UHF general cover, do the
following mods :
1) Remove the front panel.
2) Look for the first part
where the Lithium battery is connect.
there are 8 connectors like
:
To validate the
micro controller, do next :
For the FT-411 : RX 120 - 174 Mhz TX 140 -
174 Mhz
1) Reset the TRX by switch on it with [MR] and [VFO] key
down.
2) Type 1200 [VFO] 1740 [VFO] 1400 [VFO] 1740 [VFO]
3) Press the [F]
and [7] keys tho change the QSY step.
BE CARREFULL, with this few mods,
the TRX looses the automatic AM detection.
For the FT-811 : RX 420 - 470
Mhz TX 420 - 470 Mhz
Do the same but step 2 is different :
1)
Idem
2) Type 4200 [VFO] 4700 [VFO] 4200 [VFO] 4700 [VFO]
3)
Idem
19-07-1998 FT-411
Modification via computer
I was unhappy with the FT-411's "3"
mode because the frequency had to be entered starting with the 100 MHz digit,
and the ARS function would not work. I now use it in the "2" (normal) mode with
the following mod.
I used the "clone" mode to dump the FT-411's ram to a
computer. It's 9600 baud, 1 start bit, 1 stop bit, CMOS logic. 544 bytes are
dumped when the up arrow is pressed. Starting with byte $211 are the upper and
lower transmit and receive frequencies, stored in BCD. I changed these to the
limits I wanted. My FT-411's upper PLL limit is 195.4 MHz, so I used 195 MHz.
The lower limit MUST remain set to 130 MHz (magic number) or the keyboard entry
of frequencies will start with the 1 MHz digit .VS. the 10 MHz digit. To put the
data back into ram, just press the down arrow and send the new 544 bytes to the
FT-411. You could also just clone an H.T. that has the limits you want. You can
not clone a mode "3" H.T. to a mode "2" H.T., however. The mode is contained in
the first byte, which must match.
19-07-1998 FT-411 to
packet
For those that wish to connect a ft 411 to packet via a
mfj tnc the following modifications are needed. In the black lead from the tx
audio out insert a .01-0.1uf cap. In the red lead from the ptt, insert a 2.2k
rst.
Then combine these into a common single lead connected to the tip of
the small mike plug. The yellow rx audio goes to the tip of the large speaker
plug. And the shield goes to the ring of the large plug. This information can be
found in the 1989 august issue of 73. Page 58 it workes for me.
73'S
[email protected]
19-07-1998 Extended frequency coverage mod
for the FT-411
Yaesu has sent out the following as an extended
frequency coverage mod for the FT-411. I tried it and it works as advertised.
First remove all black screws from case. Remove 4 silver screws holding the
battery connector on bottom.
Remove the 3 knobs. Carefully separate the front
and back. There is a multiconductor trace between the front and back so hinge
the front from the back to keep from putting too much tension on the traces.
Looking at the board side of the front cover there are 8 little solder pads.
They are half hidden by a cover plate and the multiconductor trace. Pad 2 will
have a solder connection, the rest are open. Remove the solder fro the battery
connector on bottom.
Remove the 3 knobs. Carefully separate the front and
back. There is a multiconductor trace between the front and back so hinge the
front from the back to keep from putting too much tension on the traces. Looking
at the board side of the front cover there are 8 little solder pads. They are
half hidden by a cover plate and the multiconductor trace. Pad 2 will have a
solder connection, the rest are open. Remove the solder from pad 2 and place a
solder bridge on pad 3. All other pads will be open. Close up radio.
Now
when you turn on radio it will come up with 1.000 in the display. Memory channel
should say 1. Program in the lower receive frequency.
Example 1 - 4 - 1 - 0
then push VFO key. The Memory channel should go to 2.
Now program in the
upper receive frequency. i.e. 1 - 6 - 5 - 0 and push VFO key. Memory will move
to 3. Do same for lower and upper transmit frequencies.
Note. The receiver
sensitivity falls off at 162.55 to about 1 uv. The step and repeater offset will
need to be re-programmed also. Follow instruction manual.
19-07-1998 FT-411 out of band modification
(Software)
I discovered a nice trick to increase its frequency
coverage.
It is so simple that you don't even have to open your hand held.
All you have to do is:
- Make sure that the power switch is off.
- press the UP arrow and DOWN arrow together, at the same time (those keys
are also called A, and B. and they placed at the upper right side of the
keyped)
- Keep pressing both buttons and turn the power on.
Now you can
receive 130-174Mhz, and transmit 140-150Mhz.
CAUTON:
When you do this
modification the memories can be erased. Ayhow I think it is not the end, and
there are some more options. If you do have some more information about this
Hand held, Please leave me a msg with it.
Tnx, AVIAD,
4X6TL@4Z4SV
19-07-1998 PTT mod for
FT-411
Hello, a few days ago i was using my friend's Yaseu FT-411
and found out this neat trick!!! First, a little background... As i'm sure some
of you know, Yaseu came out with the popular 411 a few years ago. Just recently,
they came out with an "enhanced" model, the 411-E. The only found difference is
the frequency lock of the radio. THe 411E has a feature that lets you lock the
ptt as well as the frequency.
To activate ptt lock on the 411:
- Turn radio off
- Push the 6 button, hold it and turn on the rig while your still holding
it.
- Now, press FM 6, you should see "L".
- Press FM 6 again, you should see "PTT"(Both L and PTT will appear in the
bottem left corner of the lcd display).
Congradulations you have installed ptt lock in ur rig. To turn it
off, just repeat those steps.
Mike-N2LPD @
N2IMC.NJ.USA.NA