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## [TowerTalk] Rotator problem solved

 To: [TowerTalk] Rotator problem solved danki6x@pacbell.net (Dan Violette - KI6X) Mon, 3 Nov 1997 11:44:36 -0800
 ```This reminds me of my youth. I had an old CDR rotator that needed a cap. I could only find eletrolytics big enough at the parts store. Put it in (not realizing it was A/C, I was in high school at the time) and stood a few feet away when I was testing it on the bench. Within a few seconds KABLAM and paper dust was everywhere (as well as acid mist as I learned later). I learned about non-polarized electrolytics fast. Dan KI6X -------------- On 3 Nov 97, David O. Hachadorian wrote: On Mon, 3 Nov 1997 15:42:58 +200 "Chris R. Burger" writes: >HAM IV ROTATOR PROBLEM SOLVED >Only question remaining: must I really buy the 'proper' cap ? I used >an >old 100uF 100V electrolytic cap from my junk box and it seems to work >fine. The 'proper' cap is approximately \$ 15 from the local HyGain >supplier. Can the electrolytic damage the motor ? Electrolytics have a low breakdown voltage in the reverse direction. There is a way to use two electrolytics back-to-back, with shunting diodes, but you would be better off buying a capacitor designed for AC use. In the states, one can go to any motor shop and get a 120V AC capacitor for about \$4, but it will be physically larger than Hy-Gain's and will have to be wired in. The capacitance value is not critical. Stay with Hy-Gain's value, or the next larger size available. I remember doing the phase shift calculations about 20 years ago to make that determination, but remember only the general conclusion, not the hard numbers of what values work. Dave Hachadorian, K6LL K6LL@juno.com Yuma, AZ -- FAQ on WWW: http://www.contesting.com/towertalkfaq.html Submissions: towertalk@contesting.com Administrative requests: towertalk-REQUEST@contesting.com Problems: owner-towertalk@contesting.com Search: http://www.contesting.com/km9p/search -- Dan Violette Amateur Radio: KI6X E-mail: danki6x@pacbell.net -- -- FAQ on WWW: http://www.contesting.com/towertalkfaq.html Submissions: towertalk@contesting.com Administrative requests: towertalk-REQUEST@contesting.com Problems: owner-towertalk@contesting.com Search: http://www.contesting.com/km9p/search ```
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