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| + | ====== Omni VI Power Up Buzz ====== | ||
| + | **From the Ten-Tec Reflector January 25, 2004** | ||
| + | Woke up this morning to a problem with my OmniVI Opt/1 and 962. On startup there is a buzz (brrrrrr) for a few seconds form the rear center to left of the radio and the display comes up a half brightness. I then tried feeding the radio with 12v from a astron supply and while I don't hear the buzz the display was still at low brightness. | ||
| + | |||
| + | ........Stuff Deleted........ | ||
| + | |||
| + | Jeff\\ | ||
| + | KT2K | ||
| + | |||
| + | ---- | ||
| + | **January 28, 2004** | ||
| + | |||
| + | I had a problem with an OMNI VI+ (964) and 962 combo this past CQWW CW contest. The buzzing had been happening at power up from time to time for a year or so. But, after the second or two of buzzing, things always worked ok, even with 48hour duty cycle. So, I ignored it. Well, right at the beginning of the contest, every time I tried to transmit, the rig would go bonkers (technical term), the power supply would buzz, rig lights would dim, etc. This happened for at least 15 minutes. I couldn't figure out an easy answer, so I powered down and used the other OMNI VI for the remainder of the contest. | ||
| + | |||
| + | After the contest I called TT service and asked some questions. I thought my trusty rig had given up the ghost. But, no, it was the | ||
| + | power supply! To demonstrate this, I used an analog voltmeter on the accessory +12v at the back of the supply. With just the power | ||
| + | supply on, it reads a solid 13.8v. But, when the on/off switch on the 964 was turned on, the buzzing from the rig was accompanied by the voltmeter shown a large overshoot in voltage, past 16v! So, the rig was doing it's thing and protecting against overvoltage from | ||
| + | the power supply. TT service indicated that some, but not all, 962s have this problem. The fix is to put a few components on the PC | ||
| + | board on the back panel of the PS. This is not recommended for home repair. Apparently the regulation circuitry in the negative | ||
| + | lead has some instability potential. | ||
| + | |||
| + | I swapped the 962 PS with the 961 PS on the other rig. Both appear to be happy now. I can't get the buzzing to show up at all. But, if (when) the problem reappears, I know to swap out power supplies. Round trip shipping and repair doesn't make economic sense to me. | ||
| + | |||
| + | Terry Zivney, N4TZ/9 | ||
