No need to be sorry. As for not operating it without a 'load', I would prefer to not take the chance. Think of it as cheap insurance.
I'm sure a lot of people have put metal in them, too, but that too is not a good idea. Joe M. Burt Lang wrote: > Sorry Joe, I misunderstood the original procedure. I can see the > purpose of the water now although I still don't believe that an empty > oven will burn out easily. If that was true, most of the ovens in the > country would now be dead because most everyone is guilty of turning on > one with little or nothing in it. > > Burt>>> > > MCH wrote: >> You don't care if the cup of water heats up - you are looking to see if >> the painted cup heats up. The water is only there to prevent burning out >> the microwave. >> >> Joe M. >> >> Burt Lang wrote: >>> Fine except for one problem. Water is an excellant absorber of the >>> microwaves used in the microwave ovens (2.45 GHz) So your water will >>> heat up quickly irregardless of the coating. The only substances that >>> are better absorbers of that frequency are animal or vegetable fats >>> because they contain 9 times the molecular bonds (the O-H bond) that >>> actually do the absorbing. >>> >>> Burt VE2BMQ (who used to be a professional chemist) >>> >>> IM Ashford wrote: >>>> Paint a polythene cup with your favourite antenna covering. Let it dry >>>> and put it into the microwave oven along with a cup of water (to act as >>>> a dummy load) >>>> Cook for 1 min on max power. >>>> If it gets even slightly warm its no good for antennas. >>>> >>>> er.. can I please have an award for the first cooking recipe to get past >>>> the moderator on repeater-builder >>>> >>>> Ian >>>> G8PWE >>>> >>>> >>>> ----- Original Message ----- >>>> *From:* skipp025 <mailto:[EMAIL PROTECTED]> >>>> *To:* Repeater-Builder@yahoogroups.com >>>> <mailto:Repeater-Builder@yahoogroups.com> >>>> *Sent:* Sunday, May 04, 2008 2:44 PM >>>> *Subject:* [Repeater-Builder] Re: antenna question - Dip It and >>>> Scotch Kote >>>> >>>> I constructed a 6 meter beam some years back, worked like a bomb >>>> even at 25ft above ground elevation. To ensure my pride and joy >>>> would last a long time I sprayed it with clear Krylon brand spray >>>> paint. >>>> >>>> The antenna was instantly unusable regardless of my efforts to >>>> remove the paint, re-tune or otherwise modify the antenna. I later >>>> learned that type of paint contained materials with a horible >>>> D-Factor. I was never able to use the antenna again, although it >>>> remains in my back yard as a reminder. >>>> >>>> cheers, >>>> s. >>>> >>>> > "Chuck Kelsey" <[EMAIL PROTECTED]> wrote: >>>> > Boy, you took a gamble. I'd have been afraid that this action >>>> > could have either messed up the VSWR or shifted the resonant >>>> > point of the antenna. Then again, maybe it did and either >>>> > you don't know that or it wasn't significant. >>>> > >>>> > Chuck >>>> > WB2EDV >>>> > >>>> > >>>> > ----- Original Message ----- >>>> > From: "skipp025" <[EMAIL PROTECTED]> >>>> > To: <Repeater-Builder@yahoogroups.com >>>> <mailto:Repeater-Builder%40yahoogroups.com>> >>>> > Sent: Sunday, May 04, 2008 12:19 AM >>>> > Subject: [Repeater-Builder] Re: antenna question - Dip It and Scotch >>>> Kote >>>> > >>>> > >>>> > > Hi Robert, >>>> > > >>>> > > You might get lucky... because they might also have advertised >>>> > > the dip-it as an insulator material, which means someone was >>>> > > hopefully looking at the dissipation factor (aka D-Factor) when >>>> > > the compound was engineered. Time will tell... >>>> > > >>>> > > cheers, >>>> > > skipp >>>> > > >>>> > >> "georgiaskywarn" <kd4ydc@> wrote: >>>> > >> Someone else told me that after I had put a whole can of dip >>>> > >> it on the db408 I showed you. I went back and covered every >>>> > >> inch of it with liquid electrical tape. I have had good >>>> > >> results in the GA sun with it. >>>> > >> 73, >>>> > >> Robert >>>> > >> KD4YDC >>>> > >> >>>> > >>>> >>>> >>> ------------------------------------ >>> >>> >>> >>> Yahoo! Groups Links >>> >>> >>> >>> >>> >> ------------------------------------ >> >> >> >> Yahoo! Groups Links >> >> >> >> >> > > ------------------------------------ > > > > Yahoo! Groups Links > > > > >
