I can't measure the reflected power. I can measure SWR and that is flat. I am going to change it to another pair of folded dipoles and see if it changes anything.
Aaron --- In Repeater-Builder@yahoogroups.com, "Steve Bosshard (NU5D)" <[EMAIL PROTECTED]> wrote: > > The power should not have changed.....I suspect you incur an antenna problem > when u add the second half, causing some reflected power causing the > repeater to start shutting back. Wonder what the forward and reflected > power are, before and after? > > I am not sure about a 3 way connector....A DB Products Model 224 has a > splice in the middle, and feed point at the bottom. Might be worth while > the double check the antenna and be sure the harness hasn't been tinkered > with... > > Steve NU5D > > > On 5/30/06, atms169 <[EMAIL PROTECTED]> wrote: > > > > Yes, I was using the Top Half of a 4-element antenna. I have now > > added the 3-Way connector and now have the entire antenna connected. > > I have noticed it has cleaned up the receive on week stations but, it > > seems to have dropped a little in the signal. > > > > 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)" > > <bosshard@> 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 <kb6zop@> 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 > > > > > > > > > > > > > > > > > -- > Ham Radio Spoken Here.....NU5D > 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/
