Labels:book | monitor | reckoner OCR: ENWOOD ASB .995 SERVCE BULLETIN Amateur Radio Division SUBJECT DATE TS-450/TS-690 Calibration Cable Change May 11 1992 The TS. -450/690 may not calibrate properly against WwV (xfr) when using the calibration cable that supplied with early versions of these sets, (Serial numbers below 311XXXX and when an antenna that i5 shorted for DC uscd with balun prime example of DC shorted antenna This failure antenna specific multiband beam and other similar antennas do not cause this failure new calibration cable availablc that provides proper DC isolation: Failurc to use the new style cable will result in PLL unlock condition when calibration attempted temporary countermeasure that can be used until the new cable is obtained usc two conductor shielded wire minor circuit modification that adds 100 pf ...
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