Newsgroups:rec.radio.amateur.misc From:wa2ise@cbnewsb.cb.att.com (robert.f.casey) Subject:mars/cap mod file for the IC2AT Message-ID:<1992Jan12.201713.26613@cbfsb.att.com> Keywords:mod file Sender:news@cbfsb.att.com Organization:AT&T Bell Laboratories Date:Sun, 12 Jan 1992 20:17:13 GMT Lines:49 copied from packet: Msg# TSF Size #Rd Date Time From MsgID To 10043 BF 2566 1 27-Dec 2052 N2MOD 2631_NY2S MODS@ALLUSA () Sb:Icom IC-2AT MODs. MODification File For ICOM IC-2AT --------------------------------- If you have studied the schematic diagram for this radio, you will notice that pins 15 and 16 are not indicated on the programmable divider chip IC1 (TC9122). By simply connecting pin 15 thru a switch to pin 1, you will be able to move the radio up in frequency by 10 MHZ. Some of these radios were sold without covering 140-150 MHZ. The modification for this extended coverage is described below: 1) Open up the radio and locate the FLEXIBLE BOARD, this connects the thumbwheel switches to the MAIN BOARD. 2) At the MAIN BOARD end of the FLEXIBLE BOARD, add a jumper at location C4. There should already be a jumper at location C2. 3) At the thumbwheel switch end of the FLEXIBLE BOARD, remove the jumper which connects C3 and COM. 4) Reassemble the radio. Coverage is now 140-150 MHZ.(MARS/CAP) Now, if you activate the switch described above, the radio will now operate in the 150-160 MHZ range, after L3 adjustment, described below. OPERATION and L3 ADJUSTMENT: ---------------------------- 1) Activate switch and dial up a known active frequency. 2) Adjust L3 until PLL locks up and radio begins receiving. (you need an active frequency to tell when this happens) 3) To return to 140-150 MHZ, repeat above steps with switch off. NOTES and DISCLAIMER -------------------- 1) Drill a hole in the case of the radio so that L3 can be adjusted from outside of the radio. 2) The above information is presented for educational purposes only, and is not an endorsement of any particular practice. 3) This MOD has been in operation for 6 years with no ill effects on the radio 4) This MOD courtesy N2MOD. -------------------------------------------------------------------------- Note:I haven't tried or verified this, proceed at your own risk. And do not transmit outside of legal bands! WA2ISE  Amsterdam View Our Stats   CLICK FOR A FREE DOMAIN NAMES HTTP://WWW.YOURNAME.TK FOR YOUR OWN WEBSITE IF YOU CLICK HERE AND YOU CAN VOTE FOR OUR FREE WEBSITES IN THE TOP 100 LIST  WANT A TOP RANKING ? USE THE ULTIMATE SOFTWARE SUITE FOR WEB SITE PROMOTION  FreeWebSubmissions Submit Your Site To The Web's Top 50 Search Engines For Free THE ALEXA BANNER, THIS BANNER GIVES THE DALLY STATISTICS OF THIS FREE WEB SITE The World of Free Packet Radio Software Amsterdam The World Of Free Packet Radio Software Amsterdam The Netherlands |