to me this does not make sence ... what power do you get out of the duplexer with a dummy load on ..
I think you have a problem with the ant. I don't see why you would lose so much power out of the duplexer when you add the 2nd set of dipoles .. Rick On 30 May 2006 at 16:55, atms169 wrote: > > System was just re-tuned, duplexers and radios. It's a Motorola > MSR-2000 Canadian 40 Watt version. When I add the duplexers and the > top half of the antenna I get 25 Watts out. When I add the second > half I get 10 Watts out. Measuring the wattage just after the duplexers. > > I guess we will see how well it works? > > > The antenna is somewhat at a good height. It's on a 55' tower on a > hill overlooking the City. I wish it was a little higher however, > that is not possible at this time. > > Thanks > > Aaron > VA6AE > > --- In Repeater-Builder@yahoogroups.com, "Steve Bosshard (NU5D)" > <[EMAIL PROTECTED]> wrote: > > > > Depending on the degree of coupling, at VHF, the loss in 2, 8" > cavities will > > be around 1.5 dB., send or receive. 10 LOG 25/42 comes to around > 2.25 dB. > > A little on the high side. I don't understand where adding the > remaining 2 > > elements to a 4 element antenna will change the loss. > > > > Seems the repeater delivers 42 Watts. The Duplexer adds 2.25 db of > loss. A > > 2 loop antenna will have around 3 dB of gain, and a 4 loop antenna > should > > have around 6 dB. of gain. Adding the second 2 loops should help > the send > > and receive by around 3 dB. > > > > I am making the assumption that you are now using the top half of a 4 > > element antenna, and you plan to re-connect the bottom half? > > > > Steve NU5D > > > > > > > > On 5/30/06, KB6ZOP <[EMAIL PROTECTED]> wrote: > > > > > > That seems like a LOT of loss... Have you had the cans and antenna(s) > > > tuned? > > > > > > -----Original Message----- > > > From: Repeater-Builder@yahoogroups.com > > > [mailto:[EMAIL PROTECTED] On Behalf Of atms169 > > > Sent: Monday, May 29, 2006 9:46 AM > > > To: Repeater-Builder@yahoogroups.com > > > Subject: [Repeater-Builder] Double the gain or double the power? > > > > > > Easy question for all other repeater owners. What should I do? > > > > > > I have a pair of folded looped-dipole antenna's for my repeater which > > > pushes 42 Watts. Once I add the antenna and duplexers I get 25 Watts > > > output. The antenna has 4 looped-dipole antenna's with phasing > > > harness but I only use one set. > > > > > > So what should I do, should I continue using the 1 set of > > > looped-dipole antenna's at 25 Watts or do I add the second pair of > > > looped-dipole antenna's and push only 10 Watts out on the repeater (As > > > there will be a loss). > > > > > > Which would be better? I am sure I am doubling the gain for PEP. > > > Would I have a better receive on the antenna as well? Would it really > > > make it stronger? > > > > > > Aaron > > > VA6AE > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > Yahoo! Groups Links > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > Yahoo! Groups Links > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > -- > > Ham Radio Spoken Here.....NU5D > > > > > > > > > > > > > Yahoo! Groups Links > > > > > == www.karolinabc.ca == Rick,Charlote & Kids Our Border Collies Miss Daisy Duke Sir Red-A-Lot Miss Elly May Mr Boots Our Border Collie Message Group [EMAIL PROTECTED] Website www.karolinabc.ca Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
