Focal Point is usually from the center of the dish to the front end of the scalar rings. The end towards the dish. If this is a shallow dish, it will be farther away, obviously. I would double check the dish depth just to make sure. What formula did you use for FP?
Steve ----- Original Message ----- From: "ocsrc1" <[EMAIL PROTECTED]> To: <[email protected]> Sent: Wednesday, January 02, 2008 12:14 AM Subject: [TVRO] Re: Need help with measurement on 5 foot dish support arms > If my math is correct the Focal Distance is between 21 and 22" > > But I'm not sure if this from the dead center of the dish or even > with the outer edge. > > If it was dead center then the feedhorn would only be 11" above the > dish edge. > > If it is from equal with the edge of the dish, then it would be 31" > from the bottom of the center of the dish. > > Does anyone know which of these is true? > > Once I have the correct location for the feedhorn, then it form a > triange with a 90 degree right angle and I should be able to find the > length of the long side since I would know the 2 other sides. > > I know there is a formula to do this, but it's been a long time since > I was school. > > AutoCAD would be able to plug these numbers in and find the answer in > a second. > > If you have AutoCAD and can make a sketch, or JPG, SWF , or other > type of file, please send it to my primary address > [EMAIL PROTECTED] > > Thanks again > > Bill > > > > > > --- In [email protected], "ocsrc1" <[EMAIL PROTECTED]> wrote: >> >> The dish is 59" wide and 10" deep. >> >> Hope this helps >> >> Bill >> >> >> >> --- In [email protected], "Geraldo Paiva" <loures@> wrote: >> > >> > Considering the attachments is being stripped away by Yahoo, >> please see the two dimensions I need: dia of dish and depth of > dish. >> > >> > >> > !------------------ dia of dish ------------------! >> > ...................................................... ---- >> > .......................!..................... >> > ..................!.............. HOW DEEP > IS >> DISH >> > ............!......... >> > ....!.... ----- >> > >> > >> > ----- Original Message ----- >> > From: Richard A. Keirstead >> > To: [email protected] >> > Sent: Tuesday, January 01, 2008 4:36 PM >> > Subject: Re: [TVRO] Re: Need help with measurement on 5 foot > dish >> support arms >> > >> > >> > Yahoo Groups strips away all attachments. You will need to send >> the >> > sketches direct to the other person instead of via Groups. >> > RAK >> > >> > Geraldo Paiva wrote: >> > >> > > I tryed three times to send the sketch. Certainly, > Yahoogroups >> is >> > > blocking the attached sketch, I see. >> > > >> > > You have already furnished the distanCe between holes of >> feedhorn ring >> > > (5.3/4"). Ring deep 1'. OK. tHe opening of the feedhorn > extends >> down >> > > 3/4" from the bottom of the ring. OK. >> > > >> > > Are missing >> > > >> > > DIAM >> > > <------------------------------------------------------> ----- > -- >> > > . . ! >> > > . . ! >> > > . . ! DEPTH >> > > . . ! >> > > . . ! >> > > . ------- >> > > >> > > Loures >> > > >> > > >> > > >> > > >> > > >> > > >> > > >> > >> > >> > >> > >> > [Non-text portions of this message have been removed] >> > >> > > > > > > Yahoo! Groups Links > > > > > > -- > No virus found in this incoming message. > Checked by AVG Free Edition. > Version: 7.5.503 / Virus Database: 269.17.12/1202 - Release Date: > 12/29/2007 1:27 PM > >
