========================================================================= Another original file presented by Sine Wave. Sysop of The Grey Zone BBS 205-774-7453 ========================================================================= ALL-BAND TRANSMIT MODIFICATIONS During a widespread emergency, it may become necessary to transmit on specific frequencies to signal for help or to pass emergency radio traffic. These frequencies might be monitored by the Civil Air Patrol, the National Guard, United States Coast Guard, the military, or other public safety agencies. The well-equipped survival station should have complete access to receive all frequencies on the shortwave band, as well as many frequencies in the VHF and UHF spectrum. Modern worldwide amateur radio epuipment not only tunes in the ham bands, but also allows for general coverage receive, and with modification, general coverage transmit. Modern VHF and UHF ham radio walkie-talkies also allow for VHF and UHF public safety band receive as well as public safety band transmit with the proper modification. Before we get into modification details, let me first point out that using frequencies without FCC authorization could result in stiff penalties. This could include imprisonment, a $10,000 fine for every day you are transmitting on the air, and the confiscation of your equipment. The only time you are allowed to use frequencies that you are not authorized is in a real emergency when safety of life or protection of property is an immediate threat. Possessing equipment that has been modified and is capable of transmitting outside of normal ham radio band limits is not necessarily illegal--but just as soon as you press the microphone in a non-emergency situation outside of your authorized frequencies, this indeed is not allowed. Just remenber that operating on frequencies without specific FCC authorization is simply not legal except in an emergency. The popular Yaesu 757 high frequency transceiver is easily modified for all-band transmit. Simply locate the tiny white switch that is hiding under a wire bundle inside the top front of the set near the frequency selector mechanism. Simply slide the switch in the opposite direction, and your transmitter is now unlocked. Yaesu 2-meter hand-helds are not capable of going beyond their normal 2-meter range, well outside of normal ham or MARS limits. You cannot extend it into the 150MHz region. The ICOM 02-AT 2-meter hand-held and the Kenwood 2600 hand-held will both go into the 150 MHz range if some modifications are made. On the Kenwood 2600, locate the two diodes standing on end with Teflon covering the top part of their leads (which at one time were soldered together, broken, and then resoldered). Simply clip these two leads to unlock the transmitter, but be sure to reset the microprocessor by pushing the reset button before the set is capable of transmitting on any frequency at 150 MHz. On the ICOM 02-AT, as well as on the ICOM 04-AT for VHF and/or UHF work, both units require semi-major diode surgery for frequency expansion. For VHF, two diodes are removed and three are added for the ICOM 02-AT to extend all the way up to 165 MHz. For UHF work, two diodes are added to extend the range of the ICOM 04-AT. The modification is tricky and a bit complicated. (Ten dollars to Radio School, 2414 College Drive, Costa Mesa, California 92626, brings you all the instructions plus all the diodes needed for either the VHF or UHF mod.) The popular Kenwood TS430S is modified for all-band high frequency transceive operation by unplugging the 3-wire plug on the RF board that mates with socket 10. When looking at the front top of the radio, it's to the left front side right beside a larger white plug. You'll need to carefully examine the circuit board and locate the number 10 witha circle areound it to insure you have the right plug. On the brand new ICOM 735, to unlock the transmitter you simply cut diodes D33 and D34 that are standing on end near the microprocessor section toward the rear top of the radio. On the ICOM IC-745, locate the RF board on the side of the radio and cut the light brown wire at jack 7, which is going to pin 1. Your transmitter is now unlocked. On the IC-751, locate the RF board on the side of the radio and cut the black wire going to pin1 of jack 2. Your transmitter is now unlocked. On the big Kenwood 940 base station, locate IC number 109. Now find diode 130 and cut it for all-band transmit. If you want just MARS coverage, locate IC 111 and 112, and snip diode 135 beside it. On the Kenwood 930, the all-band transmit modification is a bit more lengthy--several jumpers are required which is beyond the scope of this article. Perhaps if response is good i'll prepare an article on that specific radio. None of the 2-meter mobile sets are easily converted to 150 meg frequencies. Many people have tried all sorts of modifications, but the best they can get is 149.99--and nothing higher. The ICOM thumbwheel VHF set, IC 2AT, can also be modified for 150 MHz transceive; but once you make the mod, you lose all of your 2-meter frequencies. You would be better to simply go out and buy a type-accepted VHF transceiver as opposed to ruining your present 2-meter ICOM IC 2AT set! The older high frequency radios with VFO tuning (as opposed to PLL tuning) do not easily allow any type of modification for expanded transmit or receive coverage. It would require so much modification that you would be ill-advised to try and step up any Yaesu FT101 series, 980, Kenwood 120, Kenwood 520, 820, or any of the old ICOM sets. For the old ICOM 720, the transmitter is unlocked by snipping the blue wire that's at the very end of the top hatch cover to the left middle side of the tranceiver. On the ICOM M-700 marine transceiver, the sets are already capable of working on ham radio frequencies. Despite what the literature says, no lock-out is employed because the factory already did their diode trick. Simply punch in the frequencies and you're on the air. Remember, any ham frequency on 40, 80, or 160 meters requires the mode switch to be put to the hard left positions of "A3," which enables the lower sideband filter. All other frequencies to include all marine frequencies are upper sideband--including those marine frequencies at 2, 4, 6, and 8 MHz. All marine is upper sideband. The well-trained survivalist will know the radio frequency band well to include radio operating procedures for different services. This will assist you if it becomes necessary to signal a radio call on these bands in an emergency. Today's modern ham radio equipment gives us complete access to roam the airwaves and eavesdrop on almost any type of radio communications that are out there, on the air. CRB Research, P.O.Box 56, Commack, NY 11725, offers numerous confidential frequency lists of those agencies you may wish to tune into with your general coverage amateur radio transceiver to gain more information about local emergencies and local happenings. Write for their big free catalog. While it's not illegal to modify amateur radio equipment for all-band transmit, it is illegal to use it if it's not an emergency. While you may possess a valid citizen's band radio license, using non-type accepted equipment on these bands is also not allowed, except in an emergency. Although you may possess a marine radiotelephone license or an aeronautical license, using non-type accepted epuipment is also not allowed, except in an emergency. Take your time when modifying equipment, and use modified equipment outside of your regular band limits only in an emergency situation. Enjoy..... 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