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		    Yaesu FT-5100/FT-5200 MODS
			Rev B (14 Apr 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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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

	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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Crossband Audio Enhancement:

	Effect: unmuffle crossband audio

	Connect a 27K ohm resistor between the audio-in and auido-out
	leads on the data jack (inside the shell of a mini plug, that
	is).  The mic element stays live while in xband 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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The "P" Key on the microphone:


	I was curious about that "P" key on my FT-5100, so I called
	Yeasu and they explained the situation.  They designed the the
	mic to accomidate "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:

	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 (DISASSEMLBLE) 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:

	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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