FT-450 Mars Mods
 

New TX Freq range: 1.8-30 MHz.

MARS Mod for FT-450

                            

                              Important Notice

    This information is solely for use by licensed members of MARS (Military Affiliate Radio System) or CAP (Civil Air Patrol), and release to any other party is not authorized. Use of any Amateur

      Radio product outside of the Amateur band is at the users own risk, and no guarantee of compliance with specifications outside the Amateur bands is expressed or implied. The Limited Warranty does not cover damage caused by any attempt to modify an apparatus for out-of-Amateur-band operation, nor does the Limited Warranty cover damage to components that may result from out-of-Amateur-band use.

     New TX Freq range: 1.8-30 MHz.

 Modification Procedure: Units lot 07 and above the  jumper JP4002 must be removed.

      Disconnect the power form the radio. Remove the front panel & the large RF shield to access the CONTROL PCB. Locate the solder jumper JP4002 as shown in the attached photos. Use professional de-solder tools and technique to remove the solder and open the contacts. Reassemble the radio and power cord.

 

      1.     Press and hold [ATT/IPO], [NB], and [AGC] keys, while turning the radio on. "SMADJO" will be displayed on the LCD as the memory address at the lower right side of the display.

      2.    Rotate the [DSP/SEL] knob CCW to show "TYPE" at the memory address on the display.

      3.     Briefly, press the [F] key, and confirm the "F" icon lights. While the "F" icon is displayed, press the [NB] key. "t" will be displayed at the right end of the frequency display.

      4.     Press and hold the [F] key for 3 seconds. A long beep will sound, the screen will clear and then the frequency will be displayed on the LCD. The procedure is complete.

      To return the radio to normal Ham Band mode, do procedure (1) and (2) as above, and then follow steps (3) and (4) below.

       3.    Briefly, press the [F] key, and confirm the "F" icon lights. While the "F" icon is displayed, turn the VFO knob to select "A" as displayed at the right end of the frequency display.

       4.     Press and hold the [F] key for 3 seconds. A long beep will sound, the screen will clear and then the frequency will be displayed on the LCD.

       Verify the radio will transmit in the Amateur bands only. The procedure is complete.
 

                            

 

 

Donald Stoker

I have found this mod to the radio yasu ft-450at.

1.Before doing his MOD, or if you have done his MOD, change your settings back to original and do this test.
2.Turn off the tuner.
3.Set the C.S button to SWR.(3a-3f)
a.Pess and hold the F button for 1 second.
b.Rotate the DSP/SEL knob to find PNL-C.S.
c.Press the DSP/SEL knob.
d.Rotate the DSP/SEL knob to find SWR.
e.Press the DSP/SEL knob.
f.Press and hold the F button for 1 second to save settings.
4.By using the C.S button to check the SWR, find a frequency with a 3:1 SWR.
5.Do the MOD.(5a-5f)
a.Turn OFF the radio using the ON/OFF button.
b.Press and hold the ATT/PO, NB, AND AGC buttons and press the ON/OFF button.
c.Rotate the DSP/SEL to find HF1SWR change the value from 85 to 150 by rotating the MAIN DIAL knob.
d.Rotate the DSP/SEL to find HF2SWR change the value from 85 to 150 by rotating the MAIN DIAL knob.
e.Rotate the DSP/SEL to find HF3SWR change the value from 85 to 150 by rotating the MAIN DIAL knob.
f.Press and hold the F button for 1 second to store the new settings.
6.Leave the tuner OFF.
7.Recheck the SWR on that same fequency, by using the C.S button.
8.You will notice the SWR now reads lower, because the MOD only changes the calibration of the SWR Meter, remember, the tuner is OFF. The MOD DOES NOT extend the range of the tuner.
9.With the calibration off, you don't know what the SWR is before you use the tuner, you don't know what the SWR is after using the tuner, it may even be higher.
10.Now change your settings back to original and use a wide range external tuner for SWR over 3:1, just like
Yaesu recommends in the manual on page 11.


Donald Stoker
SM2ODB

ATTENTION
The KB2LJJ takes no responsibility for any damage during the modification or for any wrong information made on this modification.