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- copied from UUCP:
- From: schuster@panix.uucp (Michael Schuster)
- Newsgroups: rec.radio.shortwave,rec.radio.amateur.misc
- Subject: AR-1000 Setup Procedure
-
- I found the article below on CIS. I don't know where the author
- got the information below, but it's FASCINATING. Anyone have the
- guts to try this? you can reach the author at the CIS Internet
- address on the bottom line, just before my .signature.
-
- =======================
- AR-1000 Reset Procedure
- =======================
-
- * What you need :
-
- - A small Philips screwdriver
- - A soldering iron (30 W max)
-
- * What to do :
-
- - Remove the antenna
- - Remove the batteries
- - Remove the tuning, volume, and squelch buttons
- - Remove the back cover (4 black screws), and disconnect it from
- the rest
- - Lay the unit flat on the table, keyboard and display below,
- antenna connector away from you
- - Unsolder the black wire from the lower right corner of
- the upper board
- - Unsolder the brown wire from the upper left corner of the same
- board
- - Remove the 3 screws that hold this board
- - Pull GENTLY this board out of the upper panel (volume, squelch,
- and tune rods come with the board - not the antenna connector)
- - Unsolder the black wire from the upper left corner of the middle
- board
- - Unscrew the 3 copper columns that hold this board
- - To get a better access on the lower board, you may wish to remove
- some of the connectors that link the upper and middle boards to
- the power supply board (the one that hides the speaker) --- don't
- forget to take note of which connector goes where !!!
- - Now take a look at the lower board. It looks like this :
-
- (X) green led
-
- +--------------------------------------------------------+
- ! !
- ! LCD display !
- ! !
- +--------------------------------------------------------+
-
-
- +-----------------+
- ! NEC !
- ! chip !
- ! D75308GF651 !
- +-----------------+
-
-
- o (A) o
- ! !
- R1 R2
- ! !
- o o
-
- +---------------+ +--------+
- ! ! ! diodes !
- ! ! +--------+
- ! !
- ! Hitachi chip ! +--------+
- ! HN58C65FP-25T ! ! diodes !
- ! ! +--------+
- ! !
- ! ! +--------+
- ! ! ! diodes !
- +---------------+ +--------+ (B)
-
-
- - Solder a piece of wire (wrapping wire is a good candidate)
- between points (A) and (B).
- - Reconnect ALL wires (solder unsoldered wires and connect dis-
- connected ones)
- - Place batteries back
- - Turn unit on : the display should be blank.
- - Now type the following :
-
- BANK
- 1 PROG 8 LIMIT 49.995 SEARCH 561.225 ENTER
- 2 PROG 50 LIMIT 107.995 SEARCH 561.225 ENTER
- 3 PROG 108 LIMIT 169.995 SEARCH 561.225 ENTER
- 4 PROG 170 LIMIT 296.995 SEARCH 561.225 ENTER
- 5 PROG 297 LIMIT 600 SEARCH 251.575 ENTER
- 6 PROG 805 LIMIT 1109995 [down arrow] 251.575 ENTER
- 7 PROG 1110 LIMIT 1300 [down arrow] 561.225 ENTER
-
- - Turn unit off
- - Unsolder the piece of wrapping wire
- - Mount the unit back (wires, connectors, screws...)
- - Turn unit on : it should be working !!!
-
- * My comments :
-
- DO NOT TRY THIS BY YOURSELF IF YOU DON'T FEEL CONFIDENT ABOUT
- USING A SOLDERING IRON ON SUCH A MINIATURIZED DEVICE !!!
-
- DON'T FORGET THAT, IF YOU FAIL, THE WARRANTY WILL BE VOID !!!
-
- Now, let's relax. From the programming procedure, it is obvious
- that you enter 7 sub-bands in the unit :
-
- 8 to 49.995 MHz
- 50 to 107.995 MHz
- 108 to 169.995 MHz
- 170 to 296.995 MHz
- 297 to 600.000 MHz
- 805 to 1109.995 MHz
- 1110 to 1300.000 MHz
-
- These are the values for the AR-1000 as sold in France. The values
- may be different for the units sold in Northern America (there may
- be other gaps, especially for cellular phone frequencies).
-
- I don't know what the following parameters (561.225 and 251.575)
- mean. I guess they indicate which RF subcircuit, which step, and
- which modulation mode to use. Anyway, since the sub-bands limits
- appear so clearly, it might be fun to experiment. See what I mean ?
-
- But, if we are to experiment, let's make things easier. Instead of
- dismounting-soldering-programming-unsoldering-mounting the unit each
- time, let's solder a 5" piece of wrapping wire to point (A),
- a 5" piece of wrapping wire to point (B). Now we have 2 free ends :
- let's solder a microswitch to them. We can glue the microswitch at
- the bottom end of the unit, near the power supply board. Resetting
- the AR-1000 is now much simpler : just open the unit (4 screws),
- flip the switch, turn the unit on, reprogram it, turn it off, flip
- the switch back, close the unit.
-
- First of all, if you replace the first "8" with "0.5", you get an
- AR-1000 with coverage extended down to 500 kHz. This may not work
- on older units. My unit didn't let me program any frequency lower
- than 0.5 MHz, or higher than 1300 MHz. Anyway, my aim was to try
- to get rid of the 600-805 MHz gap. I tried the following sub-bands :
-
- 0.5 - 29.995
- 30.0 - 219.995
- 220.0 - 409.995
- 410.0 - 599.995
- 600.0 - 904.995
- 905.0 - 1209.995
- 1210.0 - 1300.000
-
- To choose these values, I made the following assumptions : the
- original values never exceed a 190 MHz span for the "561.225" series,
- and never exceed a 304.995 MHz for the "251.575" series. I was careful
- not to exceed these ranges, because of the necessarily limited span
- of the internal VFO.
-
- These values did seem to work, since I was able to hear some TV signals
- near 620 MHz, that is, in the previous gap ! However, when I programmed
- some search banks, it sometimes refused to search, even on "authorized"
- frequencies (around 450 MHz). And, since there is nothing but TV
- channels between 600 and 805 MHz (at least in France), I restored the
- original values (except for the 0.5 MHz lower limit).
-
- Now, if you find something interesting, please keep me informed !
-
- Lionel ANCELET
- BIX : lanc
- CompuServe : 71641,1340
- (71641.1340@compuserve.com)
- --
- I haven't tried or verified this, proceed at your own risk! WA2ISE
- I haven't tried or verified this, proceed at your own risk! WA2ISE
-