Modifications for the ICOM - RogerK

Dieses ist mit dieser Schaltung also sehr leicht zu realisieren.Die Umschaltzeiten mit diesem Geraet sind natuerlich sehr kurz. Das bei AFSK eine digitale DCD Erkennung vorhanden seinmuss, versteht sich von selbst.Viel Spass bei normalen Packet und "High-Speed-PR" auf 70 cm.73 de Wilfried DL2LK @ DB0EAMThis modification is read 523 times.top of page19-07-1998(IC-4SAT) ICOM IC-4SAT extended transmit modOk, I recently asked the net for mods to expand the transmit frequency coverage of the Icom IC-4SAT so that I could access therest (or at least more ) of the 440 ham band below 440mhz.Well, the net didn't come through but a local ham made a suggestion to me that I followed up on. I mentioned that I had a mod(see attached message below) for the IC2SAT to expand its transmit range. He suggested that I look at doing the same mod (Iknow - it sounds crazy). Since I have the tech manual for both units oked at the 2S manual to see what the mod was doing. Ithen looked at the 4S manual to see if things were similiar. To my suprise (although in retrospect I'm not suprised, just suprisedthat I didn't think of it) the microprocessor section is IDENTICAL wi th only the initialization matrix of diodes being differentbetween the 2S and the 4S. Even the part numbers of the micro were the same (led me to believe that the code is the same inboth). So I tried the mod explained below.Bottom line - it worked!! I get about 30 mhz of lock range from about 435 MHz to 465 MHz. My next step will be to look atretuning the vco to move it down in the ham band more./s/ Bob Gettys N1BRMThis modification is read 341 times.top of page23-01-1999(IC-4SE) Extending the Rx. coverage of the IC-2SE and IC-4SEIt is possible to extend the receiver coverage of both of the above radios without removing the covers!With the radio turned off, but beep enabled, hold down LAMP, FUNC and V/M buttons while simultaneously turning on the radio.Keep all 3 buttons pressed. The display will fill up with all sections on, then there will be a beep, a longish gap and another beep.Once the second beep is over, release the buttons.Lo and behold, you now have coverage of any freq from 0 to 1300 MHz, except, of course, that the VCO cannot cover the entirerange. For example, the 4SE will cover approximately 380 to 480Mhz plus 805 to about 930MHz.Information originated from G8SEZThis modification is read 286 times.top of page19-07-1998(IC-551) Modification af the ScanRate and ScanSpeed for IC551DIntroduction:Here is a modification for the IC-551D 6-metre multimode radio. The mod. may be applicable to other ICOM radios of that era,eg, the 2-metre version (IC-251?, IC-211?). It is easily carried out and consists of soldering a jumper wire between two otherwires. No major disassembly is required.Background:When the 'VFO' switch is set to the 'MS' position, the IC-551D can be made to scan three user-programmable frequencies. Unfortunately,after scanning has stopped on an active frequency, it never re-starts, even if the signal disappears from the frequency.The radio remains on that frequency indefinitely. The user is forced to manually re-start the scanning, and the cycle repeatswhen an active frequency again opens the squelch.Modification:This mod. will cause the scanning to pause on an active frequency for approx 10 seconds; scanning automatically resumes at the