Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: utzoo!watmath!clyde!burl!ulysses!mhuxj!houxm!vax135!cornell!uw-beaver!tektronix!hplabs!sri-unix!Halbert.PA@XEROX.ARPA From: Halbert.PA@XEROX.ARPA Newsgroups: net.ham-radio Subject: Re: TS-430 frequency display; mods Message-ID: <12148@sri-arpa.UUCP> Date: Tue, 18-Sep-84 13:51:21 EDT Article-I.D.: sri-arpa.12148 Posted: Tue Sep 18 13:51:21 1984 Date-Received: Wed, 26-Sep-84 00:54:01 EDT Lines: 26 W3IKG's message about inaccurate frequency readout on the TS-430S is somewhat misleading. I speak as an owner of a TS-430S who knows the circuitry fairly well. The 430 never gives an incorrect frequency readout on the frequency display. The tuning knob uses an optical shaft encoder and quadrature encoding to send pulses to the microprocessor. The microprocessor counts these pulses. If you spin the knob quickly, a few pulses get lost somewhere, perhaps by the microprocessor which may be busy doing other things. So the tuning rate (kHz/revolution) is not always exactly the same. This means that you can't rely on the black marks on the tuning knob for calibration unless you don't spin the knob at high speed. On the other hand, you can always look at the frequency display, which is always accurate, since it is updated by the microprocessor and reflects the numbers the microprocessor is sending to the frequency synthesizer. So think of the marks on the knob as a styling feature, and not as calibration marks. (I have some mods by W6EED for the 430 to improve the performance of the noise blanker and correct possible AGC overshoot. They just involve changing a couple of resistors. I don't have them here, but will get them soon and send a message next week.) --Dan, N6ICX