Modifications for the Yaesu FT-470

FT-470 Undocumented features


The yeasu 470 2 meter/440 handie has a number of undocumented feature that can add to your enjoyment of this neat ht. Two modification can easily be performed from the keypad itself. This first allows the 470 to function as a 2 meter to 440 crossband repeater. The second allows you to increase the vhf receiver range.

Before you can put the 470 into repeater mode, you need to construct the following cable to p
O---------------L(-----------------------O
                        L
                        L
                        
                        /
                          8 OhmS
                        /
                        
                        /
                        L
                        L
                        L
                      -----
                       ---
                        -
                        '

After constructing and installing this cable on the handie you need to put it into repeater mode. This is done by setting the 2 meter receiver transmit frequencies (the repeater does support transmitting an offset of the receiver frequency). second turn off the 470, hold down the rpt button on the keypad and turn the power backions!

Extended receive by the Up and Down Key


Increasing the receiver coverage of the ft-470 is also very easy to perform. Turn off the 470, while holding down the up down arrow on the keypad now turn the 470 back on. You have now increased your receiver coverage to 130-180 MHz.

73'S DE Karl N0IHY @ WB0GDB MSYS @ BBSIHY in bloomington
FT 470 Unlimited (more or less) Rx mod


It's probably best to start with a clean slate, so reset your rig with the following RESET mod I recently saw on the bbs (I'm sorry but I didn't write down the contributor)

Put rig on 2m band
Turn rig off
Hold down MR, 2, VFO, and turn rig on
Let go, turn rig off
Turn rig on
Let go, then press DOWNARROW

Now for the actual mod. This mod is outlined for one band, but must be repeated on the other band (the following mod, not the RESET mod).
Remember, hardware will only support so much. Outside that all you will hear is transistor noise. (thus it's really not a tragedy that 1450 is the upper limit.) Another note of interest - after doing this mod you may observe a repeating pattern of stations as you traverse the spectrum, as if the band repeats, while the display continues to increment (Upon doing a similar, but hardware, mod to my FT 411, I noticed this condition with a cycle of 34.6 MHz. If you want this mod (411) please send me a note). This condition has been observed on the 411, but hasn't been verified on the 470. Keep an eye out just the same. You might also notice this mod is similar to many of the other mods for this rig sent lately - this is in fact a 'mod'ification of those mods. Thanks to the original contributor (again, I've lost track of who that was)
  1. Make UHF the primary band, VHF the secondary.

  2. Tune to 450 MHz.

  3. Press FM, RPTSET, and dial 0000 with the keypad.

  4. Turn rig off, then on again.

  5. Set the RPTSET to "+".

  6. Hit REV. Display should read 1450 MHz.

  7. Store this in the "U" memory.

  8. Hit REV.

  9. Tune to 430 MHz.

  10. Set RPTSET to "-".

  11. Hit REV.

  12. Tune down (and ONLY down) to 600 MHz.

  13. Press REV. Display should read 000.00 MHz.

  14. Store this in the "L" memory.

  15. Press UPARROW once to restore to 430 MHz.
To tune in any freq:

Press MR to bring up the U or L memory.
Put rig in MT (memory tune) mode by hitting MR again.
Use UPARROW or DOWNARROW to scan to freq, then store in mem.
The VFO's operate normally, and TX is still standard.
YAESU FT-470 STRAPS


I Have located a total of eight straps, four to the left of the lithium battery, and four others located under the flat white cable that interconnects the upper half with the lower half.

YAESU FT-470 STRAPS.


R69 Vertical, at the 10 o'clock position by the lithium cell.
R68 Horizontal, to the lower left of R69.
R67 Horizontal, just below R68.
R66 Horizontal, just below R67.

R71 Vertical, the leftmost of three, to the left of the upper corner of the ribbon cable connector.
R70 Vertical, the center of three of which R71 is the leftmost.
R72 Vertical, the rightmost of the three.
R74 Vertical, to the left of the ribbon cable connector, below the three. (Note that R74 is below an unpopulated capacitor that does not have a C number.)

There is no R73, or at least it is not on the circuit board and it is not in the schematic. And, yes, the order of those three is indeed R71, R70, R72, left to right.

R70, R71, R72 select the mode for the UHF portion of the FT-470. The choices are :

                     UHF CHOICES
-------------------------------------------------------------
R71   R70   R72         Rx and Tx.          Receive only
-------------------------------------------------------------
 0     0     0          430 to 440 Mhz      430 to 500 Mhz
 0     0     1          430 to 450 Mhz
 0     1     0          430 to 440 Mhz
 0     1     1          432 to 438 Mhz
 1     0     0          430 to 440 Mhz
 1     0     1          220 to 225 Mhz
 1     1     0          430 to 440 Mhz
 1     1     1          210 to 235 Mhz
-------------------------------------------------------------

R66, R67, R68 and R69 select yhe mode for the VHF portion of the FT-470. The choices are :

                     VHF CHOICES
-------------------------------------------------------------
R66   R67   R68   R69   Rx and Tx          Receive only
-------------------------------------------------------------
 0     0     0     0     144 to  146 Mhz   130 to 180 Mhz
 0     0     0     1     144 to  146 Mhz
 0     0     1     0    1260 to 1300 Mhz
 0     0     1     1    1240 to 1300 Mhz
 0     1     0     0     140 to  150 Mhz   130 to 180 Mhz
 0     1     0     1     140 to  174 Mhz
 0     1     1     0     303 to  343 Mhz
 0     1     1     1     8AL to  242 Mhz
 1     0     0     0     144 to  148 Mhz
 1     0     0     1     144 to  146 Mhz
 1     0     1     0    1240 to 1300 Mhz
 1     0     1     1     404 to  444 Mhz
 1     1     0     0     140 to  160 Mhz
 1     1     0     1    1260 to 1300 Mhz
 1     1     1     0     101 to  141 Mhz
 1     1     1     1     1R3 to 158L Mhz
-------------------------------------------------------------

(Note: The receive only ranges are enabled by powering up the unit with the up and down arrow buttons depressed...)

When there is more the one combination which has the same frequency range, the difference is the default step size and/or the default repeater offset. Of course, choices that do not match the VCO and filters do not actually transmit or receive on those frequencies. A particularly strange example is that the VHF side of the set can be set to tune from 404 to 444 Mhz, but again, it won't actually lock. Even in the 101 to 141 mode, the VHF VCO will not lock - this mustbe for use with some other sort of VCO (It looks like this would cover the aeronautical band rather nicely.) There are two really wierd VHF settings, those for 8AL to 242 and 1R3 to 158L. These must be for use with some other LCD controller - it displays truly unusual and non seguential thins when stepped through the "bands".

R74 seems to have something to do with something like selecting the IF frequency, or something else like that. When set, it really srews up the VHF reception.

My technique for determining these straps is to remove the straps that come in the unit, solder wires to each pad, run the wires out of the unit to a bank of DIP switches, screw the unit back together, and the go trough all of the DIP switch combinations. I usually use a stereo microscope and 30 guage wire for this. Since I didn't try powering the unit on with every combination of keys held down for each DIP switch combination, there may still be other secrets possible.

TRANSPONDER


The unit does a very good job as a cross-band repeater.

To enable this, turn off the radio, hold down the 'RPT' key and turn on the radio. Now, anything heard on EITHER band will be re-transmitted on the other band. There are, however, a few problems.

First, there is no real internal path for the audio to get from the receiver to the transmitter, so you either have to modify the radio, to provide a path, or do what I did which is to build a short loop back cable connecting the tip of the earphone jack to the tip of the microphone jack like this:

      Mick <-------------IIIII------------> Ear.

                        100Kohm

This is the way I did it, others have talked tohave used either just a resistor like me or a small capacitor, or a combination. On my radio, this value of resistor gave me a good range of transmitted audio levels by adjusting the volume control.

The other small problem is that the radio automatically selects low power on transmit in this mode. This is probably because of the lack of a real duplexer.
Sensitive for the FT-470, from 130-180, to 430-500 MHz


MHz ÁV
130 1
135 0,44
140 0,22
145 0,21
150 0,26
155 0,6
160 0,9
165 2,4
170 8,1
175 27
180 90

430 0,21
435 0,21
440 0,21
445 0,21
450 0,24
455 0,31
460 0,5
465 0,9
470 1,2
475 1,3
480 2,9
485 6,9
490 5
495 6,9
500 14

YAESU FT470 cross-band repeater


If you turn on the radio with the RPT key depressed, the radio becomes a crossband repeater. Dial up two frequencies you want to crosslink (be sure to pay attention to transmit offsets, if any), turn the radio off. Depress the RPT key while turning it back on.
The tone encode/decode flags and the -+ flags will be flashing. When either band's squelch opens, the other band is moved into the primary frequency display and the transmitter keys.
Note that the power output is decreased to LOW power. I made up an audio interface, using a mini and sub-mini phone plug. Tie the grounds together, and connect the center pins through a 0,01 uF cap. and 47K resistor in series.
Adjust the volume control to about the 11 O'clock position. It work for both simplex cross-band and using a repeater on one band and a simplex freq on the other band. You do have to wait for the repeater to drop before you transmit on the simplex freq.
Software RX frequency expansion


  1. Program 144.000 simplex into VHF vfo.

  2. Press Function key F/M and then press RPT key to obtain the repeater shift.

  3. Enter the code 0000 (four time zero).

  4. Turn the radio off and then back on.

  5. Press the RPT key twice to set + offset.

  6. Press REV key once. Now display is 1.144.000 MHZ.

  7. Enter this freq. into the U memory (Upper scanning limit) without the repeater offset.

  8. Now from 1.144.000 MHZ with + displayed in VFO, go to 1.100.000 MHZ. The fastest way is to push F/M key and DOWN key but if you pass 1.100.000 MHZ, you will need to restart from the beginning.

  9. Push REV key to obtain 100.000 MHZ on the display.

  10. Enter this into the L memory (Lower scanning limit) without the repeater offset.

  11. Enter a value of 200.000 MHZ in U memory.

  12. Now you can use the two limit memories L AND U as a third VFO able to scan from 100 to 200 MHZ (push F/M and MR when you are in L memory).

  13. For UHF repeat same process at UHF vfo starting from 430.000 MHZ to obtain a range of 400 to 500 MHZ.

  14. The sensitivity is lower than specifications outside the amateur band, but there are many transmitters you can stil monitor.

  15. After this modifications restore your repeaters offsets.

***TURBO SCAN*** 20 frequency in sec


The way to get it to turbo scan is easy. it's done all on the key board. here's how it goes:
  1. Bring up your main band and your sub band on screen

  2. Press fm then the alt key

  3. Press either the up or down button to scan in alt mode

  4. Open sql and look at your main frequency
    a) if it stopped on a uhf frequency close sql and try again until you get a vhf frequency on main band

  5. Now comes the easy part. while the sql is still open hit the vfo button

  6. Close the sql and hit either the up or down to scan again.
Bang!!! you got it at 20 frequencies per second.

***To get out of this mode***
  1. Hit either the up or down button to stop scan mode

  2. Hit the fm button

  3. Then hit the alt button right after and your back in regular mode.
You will not loose any memory with this mode
VHF xmit and UHF recive


Here is a reposting of the mod to extend the receive range of the new Yaesu dual band handie to 130 - 180:
  1. Turn radio OFF.

  2. Hold down both UP and DOWN arrows.

  3. Turn radio back ON.
I will trade the mod for VHF xmit for one to open up UHF for recieve...I want to listen to UHF public service (450-470).

To enable VHF transmit:
  1. Open the radio such that the two halves open like a sandwich.

  2. Locate the internal lithium battery

  3. Locate several solder pads to the left of the lithium battery.

  4. Just to the top left of the lithium battery is ONE vertical solder pad. It is almost under the top left edge of the battery.

  5. solder a jumper accross this pad.
Notes:

The other solder pads do several things, none of which seemed interesting to me: one set VHF band to 144-146, one replaces 2m band with 1260Mhz (would be nice if there was a 1260 Mhz RF module available...), two others seem to disable the squelches for the separate bands...etc. like I said, not too interesting.

Also note that for some reason the automatic repeater shift (- offset below 147, + above etc...) goes away when you enable VHF xmit using this mod. I guess you can't have your cake and eat it to. Oh well...
1240-1300 TX & RX...and...220-225 MHz TX & RX


I have been reviewing the ft-470's capabilities for some time now, and was just wondering if anyone out there in rf land has done two neat mods that i have here! we all know that by removing r69 and jumppering it, you will be able to tx & rx from 140-174 mhz! well, further reviewing made me quite curious!

There are two more mods that you can do with only two (2) micro dip switches, which will give you: 1240-1300 tx & rx...and...220-225 mhz tx & rx! gee, that is two more ham bands, and with the aid of the dip switches, we have a total of 4 ham bands! this idea is not mine in it's entirety, it has been here for some time, but with only two dip switches it is a welcome treat indeed! for the vhf side of things:

Remember r69 that you removed and jumpered? well, if you remove r68 and and a dip, when you engage the switch it will give you 1240-1300 mhz tx & rx! you see, it actully takes two switches, one for r69 and one for r68. Well, r69 is already done so don't worry about it! and when you disengage it, it will perform as normaly as it did before!

UHF side of things:

If your rig already can tx from 430-450 mhz, you are half done! when this mode was performed, you removed and jumperedr72, right? now, all you have to do is remove and jumper r71, which will coexist with r72, and get 220-225 mhz tx & rx! gee, that was neat huh!?
Of course, you did use a dip switch for r71, right!?
I recieved the mods from my local bbs, and at the moment can not remember who gave all this neat info, but there is sure a lot of it! i figured that if you are boared of a certain band, You could change it! i have not done this yet, and am wondering if anyone out there has, and what type of sucess he/she had! what kind of tuning was necessary,(if any!) output power, you know, the rundown bit! well, hope this helps, and again, hats off to all those who contrib uted!

The mod floating around (for quite a while now) that tells how to get the FT-470 to tx & rx in the 220 & 1250 mhz bands does NOT work. I have this radio and tried the mods for the rig. The rig will convert to those bands, but only for looks. It niether tx or rx there. I contacted Yaesu directly and they confirmed this. Would ha been a nice touch! Oh well!

Strappings for FT470-R


A2650 FT470 Strappings


TYPE    Freq.Range        preset freq.   Repeater shift
====    ===============   ============   ==============
 A1     144-148/430-450    144/430        0,6 /  5 Mhz
 A2     140-174/430-450    140/430        0,6 /  5 Mhz
 A3     140-174/430-450    140/430        0,6 /  5 Mhz  
 B1     144-146/430-440    144/430        0,6 /  7,6 Mhz
 B2     144-148/430-440    144/430        0,6 /  7,6 Mhz
 B3     140-174/430-440    140/430        0,6 /  7,6 Mhz
 C1     144-146/430-440    144/430        0,6 /  1,6 Mhz
 C2     144-148/430-440    144/430        0,6 /  1,6 Mhz
 C3     140-174/430-440    140/430        0,6 /  1,6 Mhz
 D      144-146/432-438    144/432        0,6 /  1,6 Mhz
 F      144-146/430-440    144/440        0   /  5 Mhz


TYPE    R66   R67  R69   R70   R71   R72
====    ===   ===  ===   ===   ===   ===
 A1      x                            x
 A2            x                      x     (TX= 140-150)
 A3            x    x                 x
 B1      x          x     x     x
 B2      x                x     x
 B3            x    x     x     x
 C1      x          x           x
 C2      x                            x
 C3            x    x           x
 D       x          x     x           x
 F  


 Control Unit jumper position   x = Available zero ohm resistor
                                  = open

                                 !-----------------------!
                                 !                       !
  --------------------------------                       -----------! 
  !                                                                 !
  !                                                                 !
  !                                                                 !
  !                                                                 !
  !                                                                 !
  !                HHHHHHHHHHHHHHHHHH                               !
  !                H                H                               !
  !                H  micro-        H                               !
  !                H  processor     H                               !
  !                H                H                               !
  !                H                H                               !
  !                H                H                               !
  !                H                H                               !
  !                HHHHHHHHHHHHHHHHHH                               !
  !                                                                 !
  !                                                     .           !
  !                               R 6 8               /            !
  !                                              R  /              !
  !                             R 6 7            6/                !
  !                                             /9                 !
  !                             R 6 6          /    battery        ! 
  !     R R R        ==                       .                    .!
  !     7 7 7        ==                                          / !
  !     1 0 2        ==                                        /   !
  !                  ==                                       /    !
  !                  ==                                     /------!
  !                  ==                                    /!
  !                  ==                                  ./ !
  !                  ==                                      !
  !                  ==<stekker bandkabel                    !
  !                  ==                                      !
  !                  ==                                      !
  !                  ==                                      ! 
            Onderkant print verder niet getekend.......


For packet : power save OFF!!!!
             C 3089 and C 3093   out!!!(squelch faster((4,7 uf))

FT-470 9k6 mods


First you have to get the transmitter unit with the BNC connector on it out of the ft. You have to made the connections to pin 1 and pin 10 of the 430 PLL UNIT (it ist printed )on the rear. Pin 1 is ground an pin 10 will be the new RX. Use aprox. 10 cm cables.

Know the TX: You can reassemble the unit because the point you need is on the front of it. What you need is pin 11 on IC 10487 (it is under the shield). Pin 1 of 10487 is marked with a dot and it counts against clockwise.
The guy who have done this recommended to use 10KOhms resistors in line. The TX switch is like in 1200bd packet.

So Peter, i hope this will help you.
As you can see I have some problems in finding the right word for the electrical things ... sorry.

Full Reset


Effect: Severe! :-)

  1. Make hard (paper) copy of all memory info
  2. Turn radio off
  3. Hold down VFO and MR and turn radio on
  4. Replace all memory contents
Notes:
This will reset the auto repeater offset function, so you will need to re-enable it if you use it. This will also disable (mask) all memories except #1, so you will have to enable each of them by hand.

FT-470 Clone Mode


Effect: Allow editing of transmit and receive frequencies.

1) Turn radio off.
2) Hold down F key and turn radio on.

Result: All segments of display are turned on. The radio will send data out the microphone tip when up-arrow is pressed. The radio will receive data when the down-arrow is pressed.

Hyperscan Mode on the FT-470


  1. Go into Alt mode by pressing [F] 2 (Alt).

  2. Press the Up or Down Arrow to activate the Memory Scan.

  3. When the Scans stops on a VHF frequency on the Left Display (The Main Band), Hit [F] VFO.

  4. Press the Up or Down Arrow to activate the HyperScan.

  5. To Stop the Function, Press [F] Alt.
A preliminary guess is that there is a software loop underway in the VFO and the Memory Scan features. By pressing these sequences of buttons, the register holding the delay count is changed , resulting in a faster loop.


This counter shows the number of hits since the 9th February 2000


Go Back To The Yaesu Mods Page

Go Back To The Main Modifications Page

Go Back To The CB / HAM Radio Main Page

Go Back To The Main Home Page


Copyright © The Defpom 1997-2008

http://www.radiomods.co.nz/