Yhis reminds me of the story of the two hams driving a guy wire stake with a sledge hammer. The one holding the stake said "When I nod my head, Hit It" Dail N6dgt
--- In Repeater-Builder@yahoogroups.com, "Paul Plack" <[EMAIL PROTECTED]> wrote: > > Uh...Burt, I think he meant water in a separate cup. Faked me out at first, too! > > ----- Original Message ----- > From: Burt Lang > To: Repeater-Builder@yahoogroups.com > Sent: Sunday, May 04, 2008 1:58 PM > Subject: Re: [Repeater-Builder] Re: antenna question - Dip It and Scotch Kote > > > 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" <wb2edv@> 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" <skipp025@> > > > 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 > > > >> > > > > > > > >
