			June 24, 1988
HW-24						Bulletin No:
Twin-Bander Mobile Transceiver			HW-24-1

		Increasing Coverage of Receiver

The following modification increases the frequency coverage of the
receiver section only.  The coverage will incease as follows:

		         From		          To		

	VHF:	144-147.995 MHz		130-169.995 MHz
	UHF:	438-449.995 MHz		360-489.995 MHz

Procedure

During this procedure, you'll reset the Tranceiver.  This will erase the
data stored in memory.  If you want to save the data, turn the
Transceiver on and write down the contents of each memory location before
beginning.

-- Disconnect the power plug from the Transceiver.

-- Refer to Pictorial 1 and remove the mounting stand.
   ////Pictorial shows removal of the [5] bottom plate screws////

-- Remove the five screws that secure the bottom plate.

-- Refer to Pictorial 2 and position the bottom plate as shown.
    ////Pictorial shows bottom plate laid beside the xcvr and to the left
of it - speaker 
        remains connected.////

--  To increase the 144 MHz band coverage, refer to Inset #1 and cut the
lead of 
     diode QD22.  Position the leads so they won't accidentally touch
each other.
     ////Insert just shows the QD22 & QD24 Lead to be cut.////

--  To increase the 450 MHz band coverage, refer to Inset #1 and cut the
lead of 
     diode QD24.

--  Apply power to the Transceiver and turn it on.

CAUTION - The next step resets the Ransceiver and clears all memory
locations.  Have you written down the contents of the memory locations
that you want to save?  This is your last chance.

--  Refer to Inset #2 of Pictorial 2 and briefly short together the two
terminals as     shown.  The current display will disappear and the
display frequencies will be     reset to 146.000 MHz and 446.000 MHz.
    ////Inset #2 shows the two terminals to be shorted. They are at the
center of the 
        bottom of the xcvr, to the right of the QD22/24 diodes and
multi-wire         connector.////

--  Turn off the Transceiver and disconnect the power.

--  Reinstall the bottom plate and wire mounting stand.

The modification of the Transceiver is completed.
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			October 27, 1989

HW-24							Bulletin No:
Twin-Bander Mobile Tranceiver				HW-24-2

		              Lithium Battery Source

Heath Parts Replacement does not stock the lithium battery for this unit.
 A source for the lithium battery is:

	DIGI-KEY
	701 Brook Avenue South
	Thief River Falls, MN 56701

	Battery type CR2032
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