home *** CD-ROM | disk | FTP | other *** search
- Subject: Re: Mods for IC-Z1A
- From: baptpdc@netcom.com (Bruce A. Pope)
-
-
- Ok, after messing around with the radio on my own and then getting the
- "official" mod, here's a summary of the various diode mods for the Z1A:
-
- Icom Z1A mods
-
- [B]+[#]+[POWER] = Extended Receive.
- VFO *DISPLAYS* 50-299.900 and 300-999.900.
- AM Aircraft band enabled.
- SET mode now has a new "PLACE" function for setting
- the direct entry starting digit.
-
- There is room for four diodes in the Z1A located on the CPU board to the left
- of the ribbon cable connector. On a US version, only the bottom two are
- installed. D15 is just below and to the right of the four diodes. These
- diodes are bigger than the rest of the surface mounted components and are easy
- to spot.
- The official ICOM mod (which I unofficially saw...) is to remove D15 for
- extended TX and to use the above keyboard mod for extended receive. According
- to the sheet, the 800-900 band is NOT available in US versions.
-
-
- +-+ +-+
- | | | | <---- Installing diodes in either of these seems to do
- +-+ +-+ nothing.
-
- +-+ +-+
- | | | | <---- IN: US Version 144-148 TX 440-450 TX
- +-+ +-+ OUT: Extended 136-174 TX 380-470 TX (Lose auto-repeater
- ^ and tone encode)
- |
- +------------ IN: US 144-148 TX 440-450 TX
- OUT: European 144-148 TX 430-440 TX
-
- +-+
- "D15"--> | | <---- IN: US Version Stock
- +-+ OUT: Extended TX 136-174 380-470 (keeps auto-repeater
- and tone encode)
-
- A word of warning about messing with the four diode pads: If you detach
- either one of the installed diodes, the CPU will reset and you'll lose ALL of
- your memories. (found that out the hard way...) D15 doesn't seem to affect
- the memories at all.
-
- Since the 800MHz band is not available in US versions, my guess is that
- there's a keyboard mod to unlock it instead of a diode. The diodes only seem
- to control the country versions. If anyone has any more keyboard mods, please
- post them.
-
- Bruce KD6ALI
-
-