From: kurt@cs.tamu.edu (Kurt Freiberger)
Newsgroups: rec.radio.amateur.misc
Subject: THE REAL Standard 558 radio mod
Followup-To: rec.radio.amateur.misc
Date: 30 Nov 1992 17:25:04 GMT
Organization: Computer Science Dept., Texas A&M University
Lines: 69
Distribution: world
Message-ID: <1fdipgINN6l3@tamsun.tamu.edu>
NNTP-Posting-Host: ai0.cs.tamu.edu
Keywords: Standard C558A extended transmit

>From a sheet that I got from a vendor, here 'tis:

MARS/CAP (Wide band transmit)

1. Remove battery and antenna.
2. Remove front case assembly block by unscrewing.
3. Remove tthe copper plate around the back side of the display section.
4. Remove the diode indicated by D2, and add a diode 1SS301 leaving other
   components intact as per the following drawing.
5. Reassemble radio and install battery.
6. Turn on power and execute master reset.

---------------------------------------------------------------------
------------+             +------------------------------------------
            |             |
            |           +------+         (PC board "donut")
            |           |      |                /
            +-----------+      +------+        / 
                        |      |      |   /---\
   PC board trace/      |   D1 |      +--+ +++ |      +-----+
   component layout     |      |      +--+ +++ |      |     |
            +-----------+      |      |   \+-+/ +-----+-+   |
            |           |      +------+    | |  |       |   |
            |           +-+----+         +-+ +--+       +---+
            |             |              |      |       |     <<< ---- CHANGE
            +-------------+              |      |  D2   |
                                         +------+       +---+
                                                |       |   |
                                                +-----+-+   |
    "Not to scale"                                    |     |
                                                      +-----+ 
                                             **
                                             **
                                            \**/
                                             \/
               +--------+                 (about here)    +------------+
               |        |                                 |            |
               +--+     |                  +----+         |            |
  PC board locator|     +-----------------/------\--------+            |
               +--+                                                    |
               |                                                       |
               |                                                       |
               |                                                       |
               ++                                                +-----+
                |                                                | 
               ++                                              +-+
               |                                               |
               |                                               |
               |                                               |
               |                                               |
               |                        Opening for            |
               |                        speaker about          |
               |                        here (funny            |
               |                        shaped opening)        |
                ...............................................

CAVEAT:  I have not tried this with my radio as yet.  This is a drawing that
I got from a vendor.  I'm waiting for the 1SS301 diode to get here, as I could
not find the configuration of the 3-legged beastie.

Your mileage may vary.

73/Kurt

---                                                
Kurt Freiberger, wb5bbw	  kurt@cs.tamu.edu   409/847-8607  fax:409/847-8578
Dept. of Computer Science, Texas A&M University      DoD #264: BMW R80/7 pilot
"We preserve our freedom using three boxes: ballot, jury, and cartridge."
      *** Not an official document of Texas A&M University ***
 
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