Predicta

Ken Miller · **Posted:** Mar Thu 08, 2001 9:41 pm

There may be some differences in the mounting bracket, but I am 99% sure that the antenna is the same on all the Predicta sets that have telescoping antennas. I bought three of the antennas that were advertised as being replacements for the 17" set, and they turned out to be the same as the antennas on the 21" sets (of course, they may not have been the right antenna for the 17" set in the first place). Unfortunately, I gave away all my extra antennas in a deal I made a few weeks ago. ------------------

Andy Coleman · **Posted:** May Thu 24, 2001 3:12 am

Well, I'm back from the dead. The laywers didn't eat me, so I'm back to working on the Predicta. One electrolytic with three values seems unmarked at the base, so it's a guess which value goes where. Fun and games.Andy------------------

robert1 · **Posted:** May Mon 28, 2001 8:36 am

robert1 wrote:

quote:<HR>Originally posted by Ken Miller: Excellent point about getting rid of the moisture, Brian. The question is can I get away with running a largely exposed high voltage winding long enough to get the moisture out? Might I be better off baking the transformer in an oven (maybe at something like 150 degrees F)? It gets pretty darn hot in my attic in the summertime - maybe I should stow this one in the attic for a while and swap another onto the chassis. I have 4 chassis and I intend to get two of them working. The other two are for parts. When summer gets here I could pull the transformer out of the attic and encapsulate it then.<HR>

about placing it in the attic-to dry it out...will not work. the humidity is high during the summer months. the best way to dry that transformer out is to just operate it in intervals starting from 10 miniutes on..10 miniutes off, gradually increasing the amount of time it is on. this method usually takes about half of a day, but it does dry it out. ------------------

Ken Hoffman · **Joined:** Jan Thu 01, 1970 1:00 am **Posts:** 5326

Hi, I use a blow dryer on low heat and it works fine, will save you from turning that chassis on and off all day. ------------------

robert1 · **Posted:** Jun Mon 11, 2001 6:49 am

robert1 wrote:

quote:<HR>Originally posted by Ken Hoffman: Hi, I use a blow dryer on low heat and it works fine, will save you from turning that chassis on and off all day. <HR>

that method does not work really well as it does not drive out the moisture deep inside the transformer. you would have to stand there for a long time holding the dryer. the method that i suggested in the previous post dries it out from the inside & it is the most effective way i have found to date.------------------

steve rosenfeld · **Posted:** Jun Wed 13, 2001 2:36 am

all modern transformers are made with magnet wire . that is copper wire with a special type of varnish that is baked on. you have to work at it to scrape it off or damage it. DO NOT use regular varnish to insulate windings . you need to know the operating voltage of you transformer and then you can purchase special insulating varnish by reading the voltage breakdown specs. some dry at room temps some need to be baked on for a specified time & temp.you can bake moisture out of transformers at low temps (150 to 175 deg F)in an oven. 4 to 8 hrs at these temps will chase moisture out of most components . (do not do this with sealed units they will explode )good luck!!!!------------------

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