Yeah, forgot to mention Scala. I use a lot of their antennas in non-amateur
endeavors.
--- Jeff
> -----Original Message-----
> From: [email protected]
> [mailto:[email protected]] On Behalf Of Fred Seamans
> Sent: Friday, July 02, 2010 7:53 AM
> To: [email protected]
> Subject: RE: [Repeater-Builder] Re: [Repeaters] Looking for
> HD 440 Yagi
>
>
>
> Jeff: Kathrein-Scala Antennas makes good heavy duty yagi and
> a log periodic antennas with radom and without. I have used
> them before. They will survive most mountain tops with ice
> and salt water sprays. They are expensive.
>
> Fred W5VAY
>
>
>
> ________________________________
>
> From: [email protected]
> [mailto:[email protected]] On Behalf Of Jeff DePolo
> Sent: Thursday, July 01, 2010 11:29 PM
> To: [email protected]; [email protected]
> Subject: RE: [Repeater-Builder] Re: [Repeaters] Looking for
> HD 440 Yagi
>
>
>
>
>
> I'll echo most of Dave's comments, and add a few...
>
> > The MYA's tend to have finicky tuning, and I've never seen
> one sweep
> > correctly out of the box. Close enough probably, but not optimized
> > either. The BMOY's are broad band, with one model covering 406-440
> > MHz and another from 440-480 MHz.
>
> Maxrad stopped making the MYA antenna that I used a lot -
> MYA43012 - 12
> elements, 430-450 MHz. Now you can only get the 12 element
> model in 450-470
> range :-( I never had much problem tuning up the MYA yagis,
> but as Dave
> said, they usually weren't tuned well out of the box. Sealing up the
> connector is a PITA; I always removed the rear (reflector) element,
> removed/loosened the hardware to allow the feed to be slid to
> the rear of
> the boom, and then proceeded to put my jumper on it and seal
> it up right
> before sliding it back into position and tuning it.
>
> I'm now buying Sinclair SY307 series and Comprod 430-70 yagis
> (7 element, 10
> dBd each, very close to being clones of each other) at about
> $140 each.
> Have about a dozen in service and more in stock for upcoming
> projects. My
> only complaint thus far is that they seem to not be
> consistant on what kind
> of connector is on the end of the pigtail - some came with N
> males, some
> with N females - picky picky.
>
> The Antennex gamma-fed UHF yagis are real dogs. The tuning is
> extremely
> touchy. Minor changes in placement of the jumper/feedline
> throw the tuning
> all over the place, and slight changes in distance from the
> mast and/or
> changing polarization will require retuning. The Sinclairs
> and Comprods are
> mostly immune to detuning in that regard, and always sweep
> well across the
> entire spec'ed range. I bought four of the 12-element models
> (two silver,
> two gold) when I found out I couldn't get the Maxrads any
> more, and they're
> still sitting in the warehouse, I wasn't happy with them
> after I tested
> them.
>
> I, too, had/have a lot of the old Larsen's in operation (5
> and 8 element),
> but they don't make the ham splits any more. Although they
> aren't built as
> rugged as some of the others mentioned, they've held up
> pretty well. I just
> took down two of the 8-element models that had been up on a
> mountain for
> about 15 years and, aside from a couple of bent elements from
> falling ice,
> had held up pretty well. I replaced them becuase a) they were
> getting old
> and beat up, and b) I wanted to replace the feedline runs anyway so I
> figured I may as well swap out antennas at the same time, one
> less 200+ mile
> trip and tower climb to make in the future. I still have four
> of them at a
> site that have been up for just about 20 years now and they're still
> working.
>
> --- Jeff WN3A
>
>
>
