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:* [email protected] >>> <mailto:[email protected]> >>> *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: <[email protected] >>> <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 > > > > >
