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QRZ! Ham Radio 18
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QRZ Ham Radio Callsign Database - Volume 18.iso
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htx245.txt
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2001-11-01
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R.S. HTX-245 MOD
CAUTION MODIFICATION TO RADIO WILL VOID WARRANTY
this mod is for the new dual band HT from radioshack cat#19-1106
out of the box the radio will go from 144-148 rx/tx and 438-450 rx/tx
the mod will rx and tx from 136-174 and 420-470
1. remove screws from back cover and battery compartment
2. remove nuts on volume and antenna jaack
3. unsolder speaker connections
4. carefully remove entire circuitry from shell
5. the smaller circuit board will un plug from main board
6. towards the middle top of the large circuit board their is a black
square processor chip. to the left corner their are 2 solder pad jumpers
that are facing vertical in comparison with the board. to extend rx
remove bridge
closest to right side. (the left jumper will only allow 144-146 and
430-440 tx/rxonly)
7. to exend transmit unsolder the other pad that is horizontal in comparison
to main
board. (if MARS/CAP is wanted just remove the horizontal jumper and
leave other
alone.140-149rx/tx)
8.reassemble radio
9. reset radio by pressing (MF) and (6) key while powering on.
----------------update---------------------------------------------------
Date: Tue, 15 Aug 2000 13:14:12 -0500
Subject: HTX-245
From: Gregory H Watson <deltabluesman@juno.com>
There has been quite a bit on confusion about the HTX-245 wide band mods.
The current .txt file on the server is at best confusing.
Hopefully, this will help answer some of the questions about performing
the mods. to this radio.
Start by removing the 6 screws which hold the case together.
Remove the channel and volume knobs.
Remove the nuts which hold the antenna and volume/channel controls.
Unsolder the speaker leads.
Carefully remove the chassis from the case.
Remove the 2 gold colored screws which hold the smaller board to the main
board.
Unplug the smaller board from the main board and set it aside.
Looking at the main board, there is a uP IC ( large black chip) at the
top.
Near the upper right-hand corner of this IC are 2 vertically oriented
solder jumpers and one just to the right of them which is horizontal.
To open wide band TX/RX, open the vertical jumper nearest the IC and the
horizontal jumper.
Reassemble the radio.
Hold the function key (F) on the side of the radio, the '6' key and the
'MR' key while powering the radio on.
All memories will be cleared and the radio will be ready for wide band
programming. In addition, the 'BAND' function will no longer go to
preprogrammed weather channels.
Hope this helps..... Greg, KA9DTZ