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From: brian@amdcl2.amd.com (Brian McMinn)
Subject: Yaesu FT-5100/5200 mods, Rev D
Organization: Advanced Micro Devices, Inc., Austin, TX.
Date: Wed, 16 Jun 1993 10:11:47 GMT
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                    Yaesu FT-5100/FT-5200 MODS
                        Rev D (11 June 1993)


This is a collection of hardware and software mods for the Yaesu
5100/5200 pair.  I have the 5100, so I can't verify these for the
5200.  I have collected every mod seen on the net (ie. Usenet) since
the introduction of the 5100, so I think this list is fairly complete.
I am interested in getting updates and corrections to this list, so
please send me e-mail if you find something that needs updating.
(This includes typos, wrong or missing attributions, caveats, warnings
about unmentioned side effects, serial numbers of radios that won't do
some of these mods, etc.)

SOME OF THESE MODIFICATIONS MAY DAMAGE YOUR RADIO IF YOU PERFORM
THEM IMPROPERLY.  WHEN IN DOUBT, DO NOT PERFORM THE MODIFICATION.

This advice is free, so remember that you get what you pay for.

        Brian McMinn (brian.mcminn@amd.com)
        N5PSS
        512-462-5389

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General Review (5100):

        Since Yaesu's advertising has already made the good points
        known, I'll concentrate on the warts and shortcomings.

        Dual In-Band Receive:  works as advertised except for
        sensitivity.  The "main" receiver works very well.  The "sub"
        receiver works very well when tuned to the opposite band from
        the "main" receiver.  When tuned to the same band, the "sub"
        receiver suffers from slightly lower sensitivity in the ham
        bands and greatly reduced sensitivity out of the ham bands.

        There is a 2m VCO/PLL/IF and a 70cm VCO/PLL/IF.  I assume that
        dual in band receive is done with the opposite band's
        receiver.  This would explain the poor sensitivity, but it
        sure raises some questions about how the duplexer works.

        I expected a type "N" connector, the radio came with UHF.

        Control wart: (are you listening Yaesu?)  You can only
        transmit on the "main" (ie. left) side of the radio.  When
        both 2m and 70cm receive are active, you change bands with the
        "BAND" button.  This swaps the left and right displays.  When
        dual in-band receive is active, the "BAND" button changes both
        the main and sub receivers from 2m to 440 or from 440 to 2m.
        Arrrgh!!!!  I would prefer a "SWAP" button to swap left and
        right regardless of mode.  (The "SUB" button is used instead.)

        Automatic backlight dim: works as advertised but the backlight
        level under low ambient lighting is WAY too low.  Manual
        control is the best solution.

        DTMF page: works as advertized, but the *&%$#@ thing insists
        on "ringing" like a phone EVERY time it receives the page
        sequence.  This means that you have to co-ordinate with the
        other station to turn the *&%$#@ DTMF stuff off at the same
        time or tolerate the "ring" at the start of every receive.

        CTCSS decode: squelch opens quickly when normal CTCSS decode
        (an option) is enabled.  There is a CTCSS page function that
        has a distinct delay between receipt of carrier with CTCSS and
        open squelch.  I don't yet understand the use of this
        "feature."

        There is no SCAN button on the front panel.  Scan is initiated
        by holding the up or down button of the mike down for two
        seconds.  The scan is blindingly fast when compared to the
        Alinco 590 that I used to have.

        Memory: memory is divided into four "banks."  Two for VHF, two
        for UHF.  Only one bank can be active for each receiver.  I
        consider this an advantage, but you may not.  There are two
        obvious (to me) uses for this configuration.  First, you can
        store frequencies for different uses in different banks.
        Second, you can activate one 2m(440) bank in the main receiver
        and one the other 2m(440) bank in the other receiver and scan
        them simultaneously.

        Heat management: After seeing the HUGE heat sink on the back
        of the Alinco 590, the Yaesu 5100's sink seems too small.  In
        a key down experiment, the heat sink of the Yaesu got almost
        too hot to touch before the fan kicked on.  If I were planning
        to run a packet station, I would definitely look into some
        extra forced air over the back of this one.  As it is, I'm a
        bit concerned about how hot it will get mounted in my
        dashboard.  [Others people don't seem to have this problem.]

        DTMF Decode and Scan: If you have CTCSS decode (an option)
        enabled on a memory and you are scanning and there is activity
        on that frequency but without the correct CTCSS tone, the 5100
        stops scan, flashes the strength meter and then continues
        scanning.  It is slower than normal scan, but still quite
        fast.

        Attributed: Brian McMinn, N5PSS, brian.mcminn@amd.com

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Backlight Control:

        Effect: manual control of backlight

        1) Hold down the MHZ key and turn radio on
        2) Use tuning knob to adjust brightness
        3) When FUNC is active, the tuning knob will adjust
           brightness again.
        4) You can restore automatic control by repeating step 1.

        Notes:  Manual is fuzzy on this feature.

        Attributed: Yaesu

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Crossband Repeat (reported as working on 5100 and 5200):

        Effect: Enable crossband repeat

        [ed -- Note that there is a 5200 specific crossband mod that
        appears later in this list -- I don't own a 5200, so I can't
        test either.  This key sequence works on my 5100.]

        1) Dial up two frequencies you want to crosslink (be sure to
           pay attention to transmit offsets, if any)
        2) Turn radio off.
        3) Hold down the RPT key and turn radio on

        Result:  The tone encode/decode flags and the -+ flags will be
        flashing and the radio will be in low power mode.  When either
        band's squelch opens, the other band is moved into the primary
        frequency display and the transmitter keys.  Audio link
        appears to be speaker to mike.

        Exit crossband repeat mode by repeating steps 2 and 3 above.

        Attributed: Yaesu

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Transmitter Timeout:

        Effect: automatically limit transmitter "on" time

        1) Hold down the HIGH/LOW button and turn radio on
        2) Use tuning knob to change the number in left VFO.  This
           number is number of minutes for the timeout timer.  The
           factory default appears to be 15 minutes.
        3) Transmitter shuts off with "Err" displayed in VFO if the
           time limit is exceeded.

        Attributed: Bill Mayhew, N8WED, wtm@uhura.neoucom.edu

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Tech Manual:

        The technical manual for the 5100 is [information wise] pretty
        spare.  No additional operating notes or hidden secrets are
        revealed.  It is worthwhile for the alignment notes and
        complete parts list.  Call the number in your owners manual to
        order.

        Attributed: Bill Mayhew, N8WED, wtm@uhura.neoucom.edu

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DTMF decoding:

        Effect: display decoded DTMF tones

        Note: [ed] this works on the FT-530, but not on my 5100.  I'm
        including it here on the chance that it works on the 5200.
        Please try it on your 5200 (or 5100) and tell me if it works
        for you.

        1) Select frequency and turn on the code squelch
        2) Press Function-Page(Code) to select a code memory
        3) Dial up to memory #7 [the 5100 won't do this]
        4) Watch the dtmf's scroll by as they are heard by the radio!

        Attributed: jmeyers@ecst.csuchico.edu (Jeff Meyers)

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Crossband Audio Enhancement:

        Effect: unmuffle crossband audio

        Connect a 27K ohm resistor between the audio-in and audio-out
        leads on the data jack (inside the shell of a mini plug, that
        is).  The mic element stays live while in crossband operation.  It
        is a good idea to remove the mic from the rig while cross
        banding if you need/want to eliminate ambient audio.

        Attributed: Bill Mayhew, N8WED, wtm@uhura.neoucom.edu

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Wireless Mike (review):

        The wireless mike sends audio over 49.85MHz, so it is can't be
        used in high RF environments (like near computers).  It
        duplicates ALL front panel controls with the exception of the
        power button.

        It interfaces to the rig via a standard mic plug. The
        receiving unit is only about 1'h x 2w x 1/2d.

        [ed] The implications of this are that the entire radio can be
        controlled via the microphone port!  Too bad there isn't a
        fancy *wired* mike with all the controls on it.

        Several people have reported trouble with the mike -- enough
        trouble for them to return it because of poor range and poor
        audio.  It works well if you sit on top of the pickup unit,
        but then you don't need a wireless mike.

        Attributed: Tony Pelliccio, KD1NR system@garlic.sbs.com

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The "P" Key on the microphone:


        I was curious about that "P" key on my FT-5100, so I called
        Yaesu and they explained the situation.  They designed the the
        mic to accommodate "future products".  The "P" key is there to
        be taken advantage of at a later date by other models.  They
        just did not want to re-design the mic again within a short
        period of time.

        Attributed: Will Collier, KB5WRK, COLLIER@gallant.apple.com

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Expanded Receive (5100):

        Good Effect: enable extended receive coverage
                New range:   128-180MHz and 420-475MHz
        Bad Effect: disable automatic repeater shift selection.

        Warning: This mod does not apply to the FT-5200 as the design
           is somewhat different.

        Warning: You must have a very steady hand or else!  A
           magnifying glass would help too.

        1) Disconnect DC Power cable from radio. ALWAYS!

        **Caution** NEVER TRY TO TAKE APART (DISASSEMBLE) THE FRONT
                    CONTROL HEAD. It will void your warranty.

        2) Remove (6) screws from Top Cover of Radio and (6) screws
           from Bottom Cover of radio.
        3) Remove Top & Bottom Covers from Radio (Be careful of speaker
           falling out).
        4) Remove the (2) silver screws on each side of the radio
           holding front control head to main body of radio.
        5) Carefully pull away (a few inches) the Control Head from
           the radio body. CAREFUL with the Ribbon Cables.

        **NOTE** There are no numbers on the circuit board so you will
                 have to match up with the diagram below.

        6) On the rear of the Control head locate, Unsolder and remove
           jumper Pad R4072.
        7) Solder across jumper pads: R4070 R4068 & R4064 (use wire or
           0 Ohm resistor)

        **NOTE** If you want to change the D/MR button on the
                 microphone to do Band Switching, now is the time.
                 See the next mod.

        8) Install front control head, speaker, top and bottom covers
           and reconnect power to the radio.
        9) Press and hold [D/MR] [F/W] [REV] keys and turn on the radio.
           Radio will now show 300.000 & 20.000 on display.
        10) Set UHF Rx Low - Press [MHz] and dial 420.00, press [D/MR]
        11) Set UHF Rx High- Press [MHz] and dial 475.00, press [D/MR]
        12) Set UHF Tx Low - Press [MHz] and dial 420.00, press [D/MR]
        13) Set UHF Tx High- Press [MHz] and dial 450.00, press [D/MR]
        14) Set VHF Rx Low - Press [MHz] and dial 128.00, press [D/MR]
        15) Set VHF Rx High- Press [MHz] and dial 180.00, press [D/MR]
        16) Set VHF Tx Low - Press [MHz] and dial 140.00, press [D/MR]
        17) Set VHF Tx High- Press [MHz] and dial 150.00, press [D/MR]
        18) Set UHF offset - Press [F/W] then [RPT] dial 5.000 press [RPT]
        19) Set UHF tuning - Press [F/W] then [REV] dial 25.0  press [RPT]
        20) Set VHF offset - Press [F/W] then [RPT] dial 0.600 press [RPT]
        19) Set VHF tuning - Press [F/W] then [REV] dial 20.0  press [RPT]
                (VHF tuning step varies by state -- many use 15.0)

        Diagram: [there are no tabs in this section - ed]

        Ok, here's where it gets tricky, but so you know, a '|'
           represents a jumper.

                !Ribbon  !                       !Ribbon  !
                !Cable   !                       !Cable   !
            ____!J4002   !_______________________!J4001   !_____________
            !   !________!                       !________!            !
            !                Rear view of FT-5100                      !
            !    ____        Control Head.                             !
            !    !  !                                                  !
            !    !__!     | | | | |                                    !
            !                        | | | | | | | | | | | | |  | | |  !
            !                        R R R R R R R R R R R R R  R R R  !
            !                        4 4 4 4 4 4 4 4 4 4 4 4 4  4 4 4  !
            !                        0 0 0 0 0 0 0 0 0 0 0 0 0  0 0 0  !
            !                        5 6 6 6 6 6 6 6 6 6 7 7 7  0 0 0  !
            !                        1 1 2 3 4 5 6 7 8 9 0 1 2  1 3 4  !
            !__________________________________________________________!


        Stock US Jumpers        After Mod. Jumpers
        R4001                   R4001
        R4003                   R4003
        R4004                   R4004
        R4051                   R4051
        R4061                   R4061
        R4062                   R4062
                                R4064
        R4067                            <- for D/MR button mod
                                R4068
                                R4070
        R4072

        This mod is on Delphi as FT5100.MOD and on anomaly.sbs.com.

        Attributed: Tony Pelliccio, KD1NR system@garlic.sbs.com

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Band Switching via D/MR button on microphone (5100):

        Effect: D/MR button on microphone performs band switching
           rather than D/MR function.

        1-5) as in above mod
        6) Remove the jumper on Pad R4067
        7) skip above step 7
        8) continue with step 8 above

        Attributed: Tony Pelliccio, KD1NR system@garlic.sbs.com

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[end of mod sheet Rev B]

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Band Switching or Tone Burst via D/MR button on microphone (5200):

        Effect: change function of D/MR button on mike.

        This is based on information from Yaesu in Japan.

        The functions of pin 5 (the microphone button) can be altered
        by changing jumpers in the control head.  To find these
        jumpers, see the section on packet radio in the ordinary
        instruction book.

                                          Control Head Jumper No
        Pin 5 Function                   Closed Jumper Marked By X
                                        1      2      3      4      5
        D/MR                            X
        Band                                   X
        1750Hz Tone Burst               X      X
        Main band Busy Out                            X
        Sub band  Busy Out                            X
        Call Channel                    X             X


        Main / Sub band busy out - When open SQL = 5 Volt DC
                                   Closed    SQL = 0 Volt DC
        [ed - I'm not sure what this means since I don't own a 5200]

        Attributed: John Newgas, G7LTQ jnewgas@cix.compulink.co.uk,
                    g7ltq@g7ltq.ampr.org

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Mute Level (5200):

        Effect: [ed - I'm not really sure]

        See above for location of jumpers, etc.

        Mute Level Selection            1      2      3      4      5
        No Mute
        Minimum                                              X
        Middle                                                      X
        Maximum                                              X      X

        Attributed: John Newgas, G7LTQ jnewgas@cix.compulink.co.uk
                    g7ltq@g7ltq.ampr.org

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Crossband Repeat (5200):

        Effect: crossband repeater
        Bad effect: CTCSS function is lost

        [ed -- there is another crossband mod in this list...]

        This is based on information from Yaesu in Japan.

        These jumpers are located in the main radio case.  For
        location, refer to the FT5200 Technical Guide.

        1) Remove (open) JP5017 on the interface unit
        2) Press and hold PRI button while switching on the power.
        3) The FT5200 will now work as a cross band repeater.
        4) The CTCSS function will be lost.

        Attributed: John Newgas, G7LTQ jnewgas@cix.compulink.co.uk
                    g7ltq@g7ltq.ampr.org

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Extended Frequency Range (5200):

        Effect: set receive and transmit range.
        Bad effect: ARS gone.

        This is based on information from Yaesu in Japan.

        These jumpers are located in the main radio case.  For
        location, refer to the FT5200 Technical Guide.

        1) Close (short) JP5001, JP5002, JP5003, JP5006 and JP5007
        2) Remove (open) JP5004 and JP5005

        The frequency range possible will now be approximately :
        VHF        Rx  110 - 180 MHz         Tx  130 - 180 MHz
        UHF        Rx  330 - 480 MHz         Tx  425 - 465 Mhz

        The radio's alignment was done at the factory for your
        original frequency bands and so there will not be optimum
        behavior outside these ranges.  Broadening the alignment will
        sacrifice performance at usual frequencies.  In practice, the
        alignment does not need adjustment.

        You can program the frequency limits now.  [ed - note the
        similarity (and dissimilarity!) to the 5100's program-limit
        sequence above]

        3) Press and hold [D/MR] [F/W] [REV] keys and turn radio on.
        4) Program in VHF low edge of Rx
                VHF high edge of Rx
                VHF low edge of Tx
                VHF high edge of Tx
        5) Repeat for UHF in the same order.

        I [John] have not done this so I can give no further advice on
        programming.

        Attributed: John Newgas, G7LTQ jnewgas@cix.compulink.co.uk
                    g7ltq@g7ltq.ampr.org

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Extended Frequency Range (5200):

        [ed - yes, there are two mods and I include them both since
        they are so different in style (and perhaps content).]

        Effect: set receive and transmit range.
        Bad effect: ARS gone.

        The following explains how to expand the receive and transmit
        frequency range of the Yaesu FT-5200 and how to enable the cross-
        band repeater operation.

        All the modifications are carried out on the interface board and
        involve removing or adding links on jumper spots.

        You will get considerably increased receive and transmit
        coverage; however, you will lose the Automatic Repeater Shift
        (ARS) feature.  You may think this is an acceptable price.
        Finally, it should be obvious,  but during this procedure you
        will obviously lose any stored memories.

        1) Remove the control head and set on one side
        2) Remove the upper and lower covers on the main chassis.  For
           convenience, remove the speaker, noting which way the two
           pin pcb connector is oriented. [ed -- does it matter?]
        3) Remove two side screws holding on the front of the chassis
           and remove chassis front.  (The chassis front is the
           surface with the contacts for the control head.)
        4) Locate a double row of ten by two jumper spots, numbered 1
           to 20.  The jumper configurations will depend on the area
           for which the rig was intended.  Note the arrangement if
           you ever want to un-modify your radio.
        5) Using a fine-tip soldering iron, set the jumper spots as
           follows:

                   1    closed
                   2    closed
                   3    closed
                   4    open
                   5    closed
                   6    closed
                   7    closed

        6) This completes the alteration for frequency expansion.
           Reassemble the radio.
        7) Reinitialise the radio by simultaneously holding D/MR, F/W,
           REV and POWER.  You must now program in the band limits.
           The display will show a blinking "1" in the left-hand
           memory box and "000.000" in the left-hand frequency
           display. (Ignore the right-hand display for now).  The
           following limits are suggested, but the RF circuitry of the
           rig will only cover slightly less.  Use the dial or up/down
           buttons to select the frequency and then press D/MR to
           store it.  The blinking "1" will increment.

           VHF rx:  137.000   174.000
           VHF tx:  137.000   174.000
           (display will show blinking "1" and "300.000")
           UHF rx:  410.000   470.000
           UHF tx:  410.000   470.000

           (Note: it is possible to set the RX limits wider than the
           TX limits; for obvious reasons you cannot have the reverse
           situation).
        8) You can repeat step 7 above at any time if you need to
           change the limits.
        9) The pre-set repeater offsets are now no longer available
           and you will have to set them up manually using the
           instructions on page 16 of the manual.  The Automatic
           Repeater Shift (ARS) feature (also on page 16 of the
           manual) will also have disappeared and you will have no way
           of getting it back (except by changing the jumpers back).


           To enable the crossband repeat, remove the link at
           jumper spot 17. (Note, just below jumper spot 17 is a
           separate jumper spot,  not part of the group of twenty -
           leave this alone).

        Attributed: Hugo Cornwall

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Cross Band Repeater (5200)

        Effect: enable crossband repeat

        [ed - this is a continuation of the above]

        1) You can enable the crossband repeater without altering the
           frequency coverage.  The only hardware alteration is the
           removal of link 17.
        2) To enable, turn on rig while holding down [RPT] button.
           The rig is now a crossband repeater - you will get
           confirmation of this from the display: the 100s position on
           the two frequency displays will be replaced by a "R".
        3) While in cross-band repeater mode you can change the
           frequencies of each band.
        4) The crossband repeater suffers from desense.  It works
           better at low power and even better if you use an external
           diplexer and separate antennas.  The more isolation between
           the two bands, the better.  As with all cross-band
           repeaters, results will be poor if the UHF frequency is a
           direct multiple of the VHF frequency.  If you are planning
           extended use of a crossband repeater, make extra sure that
           the rig is adequately ventilated.

===========================================================================

Remote Control Mike Interface (5100, maybe 5200):

        Effect:  remote (wired) control of radio

        The Remote Control Mike (from Yaesu) uses a serial data stream
        interface in the microphone jack to control the 5100.  This
        simple hardware interface allows a computer to control the
        5100 in the same way.  It is somewhat similar to the CAT
        interface I have built for my FT-757 HF rig, but mostly like
        the interface described in the FT-912R manual (loaned to me
        via a friend from Yaesu).  When using my PC as the source for
        the serial data, I used a MAX232 chip for a level conversion
        between the +/- 12 volts levels on the computer and the 0-5
        volt levels on the radio.

        The serial data parameters are 4800 N82.  The commands sent to
        the radio are simple one byte instructions.  The RMC mode ON
        command (16) must be sent before any other command.  When the
        RMC mode is ON, a small LCD "RMC" icon will light on the
        display (see owners manual under Display).  Also, the Vol,
        Sql, and Bal knobs are disabled when in the RMC mode because
        they will be controlled via serial commands, but all other
        buttons are still active.

        The commands are as follows:

          0  - RPT            12 - CALL           24 - SQL Up
          2  - REV            14 - BAND           26 - VOL Up
          4  - MHZ            16 - RMC            28 - BAL Right
          6  - D/MR           18 - SUB            30 - BAL Left
          8  - TONE           20 - PAGE           32 - SQL Down
          10 - LOW            22 - F/W            33 - VOL Down

        The interface I built simply wired mike port pin 7 to serial
        ground and pins 1 and 3 each through a diode then together, to
        the serial source.  Note: I am not a hardware person!  Use
        this hardware at your own risk.

         +----1 7-------------- GND
         |   2 8 6                      (These can be connected to a MAX232
         | +--3 5   +-+-------- SER IN   or the FIF-232C pins 1 and 3)
         | |   4    | |
         | +--->|---+ |
         +----->|-----+

        You can wire 1 and 3 together first, then through 1 diode, but
        that disables the UP and DOWN buttons.

        I'll continue to study this more.  If anyone would like to
        know more, or has any corrections or feedback, please email
        me.

        Attributed: Byon Garrabrant, KD6BCH  byon@csulb.edu

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[end of mod sheet Rev C]

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Wireless Mike Problem:

        Effect: Unexpected/Undesired Transmission

        The wireless mike will pick up any transmission in the 49MHz
        range (including cordless phones and baby monitors) and
        re-transmit them on the ham bands.  Don't leave your radio on
        and unattended with this option installed.

        Attributed: kenh@w8hd.org (Ken Hoehn)

The Fix:

        There's a modification for the MW-1 that will only let the
        radio key up when it receives both the 49MHz signal and an
        infrared command from the MW-1 remote.  I think they list it
        in the users manual for the MW-1.  [ed. with this enabled,
        some have complained that the transmit is intermittent.]

        Attributed: system@garlic.sbs.com (Tony Pelliccio)

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[end of mod sheet Rev D]

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