Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10.2 9/18/84; site brl-tgr.ARPA Path: utzoo!linus!philabs!cmcl2!seismo!brl-tgr!tgr!McAfee.ES@Xerox.ARPA From: McAfee.ES@Xerox.ARPA Newsgroups: net.ham-radio Subject: RE: Modified PLL rigs Message-ID: <10453@brl-tgr.ARPA> Date: Mon, 6-May-85 16:41:36 EDT Article-I.D.: brl-tgr.10453 Posted: Mon May 6 16:41:36 1985 Date-Received: Tue, 7-May-85 21:38:20 EDT Sender: news@brl-tgr.ARPA Lines: 40 I thought that this information from JE1RYH would be of interest to the net. Pete KD6HR ---------------------------------------------------------------- Date: 3 May 85 19:06:14 +0900 (Friday) Subject: Re: Modified PLL rigs To: HamRadio^.ES From: JE1RYH cc: Ozaki Reply-To: Ozaki.FX Do you think that ICOM, YAESU, KENWOOD and others are making separate CPUs for each band of rigs? No! They use same CPU for series of rigs(e.g. IC-02, IC-03, IC-04s). Nonetheless, they even use the exactly same CPU for JA's, Europes, USAs and other contries( you know, their band plans are bit different from one another). So, you can simply change your rig to cover freq ranges as wide as the CPU has been programed. What makes all the differences are the DIODES and some registors. It's just combination of those diodes and registors to tell CPU which mode(freq range) to operate. For example, my IC-03N (which might be IC-04A in the States) would display 50MHz, 144MHz, 220MHz, 440MHz, and even 1200MHz, too. Of course, it does not receive nor transmits on other bands, because PLL circuit is made for 440MHz band only. Our band plan for 440MHz band is between 430.00MHz thru 439.99MHz, but I could easily enlarge its coverage from 420MHz to 450MHz, by cutting one lead of a diode. If you have thumb wheel type rig, it's much easier to widen its coverage. Try to find the chip named 9122 near the PLL circuitry, that's a programmable devider which control PLL to determine the output frequency. Maybe, you'd have to study a bit about PLL circuits, but once you know the principle of its operation, it would be nothing to change it to whatever the ways you want to. Have fun with your PLLs. 73 & 88s de JE1RYH -- Yuki Ozaki ----------------------------------------------------------------