Ed-- -Upon further consideration the top half of a db224 would do what you want if you provide a suitable Z matching section, but I could not provide a solution for the appropriate matching section until I get a chance to look at my previous data measurements until I get back to EGV. The bottom half of a db224 needs a Z compensation at the jct where the top half connects to make it work as a separated ant, perhaps also needing some Z stub at the ant pigtail. Maybe not if the top matching Z section is proper. Need to make a measurement. All what you are wanting to do is possible but needs some work measuring the separated sections and constructing the appropriate Z matching sections. I did some work years ago on mounting two db224 dipoles at the same point on the pipe which would save some valuable mounting space and could be added to an existing pipe, and I constructed the necessary Z matching section which would do the same thing you want with the db222 but unknown if the resulting radiation pattern may be something you would be happy with. If you want to make your own matching section for the two dipoles located at the same point on the pipe it, if I remember correctly (and I am reliaing on my memory here now ) requires a 1/2 WL in 50 ohm coax to the jct of the 50 ohm feed line from each dipole. Each dipole has a Z=120+jxx and two in parallel would get close to 50 ohms. AC
-- In [email protected], "Com/Rad Inc" <com-...@...> wrote: > > Hello Al > > Thanks for reply - I figured that to be the case > Do you have anything in your collection resembling a DB222 > that would do 152-158 range ? > Ed > Com-Rad Inc > > ED > ----- Original Message ----- > From: wa9zzu > To: [email protected] > Sent: Saturday, August 01, 2009 9:11 AM > Subject: [Repeater-Builder] Re: DB224 Question > > > -I apologize for not giving a complete answer. > The short answer to the first question is yes. > The short answer to the second is no. > > Al Crites > > -- In [email protected], "wa9zzu" <wa9zzu@> wrote: > > > > -No > > > > Al Crites > > > > -- In [email protected], "Com/Rad Inc" <com-rad@> wrote: > > > > > > Turning to the experiences of the group as all vendor info sources are > > > off for the weekend - ( probably could research this on line ) > > > > > > Do any of you have knowledge of the chatachteristics of 1/2 of the DB > 224 antenna? > > > > > > With harness' intact does either section of this array resemble the DB > 222 ( 2 element ) antenna stack? > > > Concerned with feed impedance etc. I recall doing thihs with a UHF > version once and had reasonable results in a pinch... > > > > > > Any comments would be appreciated. > > > > > > Ed K9QPJ > > > > > >
