174 lines
7.2 KiB
Plaintext
174 lines
7.2 KiB
Plaintext
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=======================
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AR-1000 Reset Procedure
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=======================
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* What you need :
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- A small Philips screwdriver
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- A soldering iron (30 W max)
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* What to do :
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- Remove the antenna
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- Remove the batteries
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- Remove the tuning, volume, and squelch buttons
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- Remove the back cover (4 black screws), and disconnect it from
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the rest
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- Lay the unit flat on the table, keyboard and display below,
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antenna connector away from you
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- Unsolder the black wire from the lower right corner of
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the upper board
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- Unsolder the brown wire from the upper left corner of the same
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board
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- Remove the 3 screws that hold this board
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- Pull GENTLY this board out of the upper panel (volume, squelch,
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and tune rods come with the board - not the antenna connector)
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- Unsolder the black wire from the upper left corner of the middle
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board
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- Unscrew the 3 copper columns that hold this board
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- To get a better access on the lower board, you may wish to remove
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some of the connectors that link the upper and middle boards to
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the power supply board (the one that hides the speaker) --- don't
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forget to take note of which connector goes where !!!
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- Now take a look at the lower board. It looks like this :
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(X) green led
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+--------------------------------------------------------+
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| LCD display |
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+--------------------------------------------------------+
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+-----------------+
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| NEC |
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| chip |
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| D75308GF651 |
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+-----------------+
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o (A) o
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R1 R2
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o o
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+---------------+ +--------+
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| | | diodes |
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| | +--------+
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| Hitachi chip | +--------+
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| HN58C65FP-25T | | diodes |
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| | +--------+
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| | +--------+
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| | | diodes |
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+---------------+ +--------+ (B)
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- Solder a piece of wire (wrapping wire is a good candidate)
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between points (A) and (B).
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- Reconnect ALL wires (solder unsoldered wires and connect dis-
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connected ones)
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- Place batteries back
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- Turn unit on : the display should be blank.
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- Now type the following :
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BANK
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1 PROG 8 LIMIT 49.995 SEARCH 561.225 ENTER
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2 PROG 50 LIMIT 107.995 SEARCH 561.225 ENTER
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3 PROG 108 LIMIT 169.995 SEARCH 561.225 ENTER
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4 PROG 170 LIMIT 296.995 SEARCH 561.225 ENTER
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5 PROG 297 LIMIT 600 SEARCH 251.575 ENTER
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6 PROG 805 LIMIT 1109995 [down arrow] 251.575 ENTER
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7 PROG 1110 LIMIT 1300 [down arrow] 561.225 ENTER
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- Turn unit off
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- Unsolder the piece of wrapping wire
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- Mount the unit back (wires, connectors, screws...)
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- Turn unit on : it should be working !!!
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* My comments :
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DO NOT TRY THIS BY YOURSELF IF YOU DON'T FEEL CONFIDENT ABOUT
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USING A SOLDERING IRON ON SUCH A MINIATURIZED DEVICE !!!
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DON'T FORGET THAT, IF YOU FAIL, THE WARRANTY WILL BE VOID !!!
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Now, let's relax. From the programming procedure, it is obvious
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that you enter 7 sub-bands in the unit :
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8 to 49.995 MHz
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50 to 107.995 MHz
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108 to 169.995 MHz
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170 to 296.995 MHz
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297 to 600.000 MHz
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805 to 1109.995 MHz
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1110 to 1300.000 MHz
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These are the values for the AR-1000 as sold in France. The values
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may be different for the units sold in Northern America (there may
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be other gaps, especially for cellular phone frequencies).
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I don't know what the following parameters (561.225 and 251.575)
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mean. I guess they indicate which RF subcircuit, which step, and
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which modulation mode to use. Anyway, since the sub-bands limits
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appear so clearly, it might be fun to experiment. See what I mean ?
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But, if we are to experiment, let's make things easier. Instead of
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dismounting-soldering-programming-unsoldering-mounting the unit each
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time, let's solder a 5" piece of wrapping wire to point (A),
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a 5" piece of wrapping wire to point (B). Now we have 2 free ends :
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let's solder a microswitch to them. We can glue the microswitch at
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the bottom end of the unit, near the power supply board. Resetting
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the AR-1000 is now much simpler : just open the unit (4 screws),
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flip the switch, turn the unit on, reprogram it, turn it off, flip
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the switch back, close the unit.
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First of all, if you replace the first "8" with "0.5", you get an
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AR-1000 with coverage extended down to 500 kHz. This may not work
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on older units. My unit didn't let me program any frequency lower
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than 0.5 MHz, or higher than 1300 MHz. Anyway, my aim was to try
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to get rid of the 600-805 MHz gap. I tried the following sub-bands :
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0.5 - 29.995
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30.0 - 219.995
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220.0 - 409.995
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410.0 - 599.995
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600.0 - 904.995
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905.0 - 1209.995
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1210.0 - 1300.000
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To choose these values, I made the following assumptions : the
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original values never exceed a 190 MHz span for the "561.225" series,
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and never exceed a 304.995 MHz for the "251.575" series. I was careful
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not to exceed these ranges, because of the necessarily limited span
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of the internal VFO.
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These values did seem to work, since I was able to hear some TV signals
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near 620 MHz, that is, in the previous gap ! However, when I programmed
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some search banks, it sometimes refused to search, even on "authorized"
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frequencies (around 450 MHz). And, since there is nothing but TV
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channels between 600 and 805 MHz (at least in France), I restored the
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original values (except for the 0.5 MHz lower limit).
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Now, if you find something interesting, please keep me informed !
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Lionel ANCELET
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BIX : lanc
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CompuServe : 71641,1340
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