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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