| |
KG6BAJ > NWSGRP 28.08.09 05:45l 57 Lines 2259 Bytes #999 (0) @ WW
BID : 10292_N1OES
Read: GUEST
Subj: Re: Emtronics TEV-1
Path: DB0FHN<DB0FOR<DB0MRW<DB0ERF<DB0FBB<DB0IUZ<DB0OVN<DB0LJ<DB0RES<WA7V<
KG6BAJ<KG6BAJ
Sent: 090827/2000Z @:KG6BAJ.#NCA.CA.USA.NOAM #:10292 [Grass Valley] InterGate $
** NEWSGROUP: rec.radio.amateur.antenna
** FROM : dplatt@radagast.org (Dave Platt)
In article <F2Flm.14372$ze1.14171@news-server.bigpond.net.au>,
George <vk4ajl@bigpond.net.au> wrote:
>Wonder if anyone has had any problems with the Emtronics TEV-1 vertical
>antenna
>I just can't get it to work
What's your feed / tuning arrangement?
Based on what I see on the page at
http://www.andrewscom.com.au/site-content-section-08-emtron.htm
the TEV-1 is simply an end-fed monopole/whip. Although it's described
as "broadband" I rather suspect that it's no more broadband than any
length of pipe of that length would be. It's going to need some form
of wide-range tuner, and a good ground and/or radials, in order to
work on multiple bands.
The Andrews page suggests four forms of feeding:
- with a wide-range "high-impedance" autotuner such as an SGC. In this
arrangement, it would be acting as part of the long-wire antenna
that these antenna couplers are designed for.
- With a 4:1 balun and a 50-ohm feedline, to a tuner in the shack. I'd
expect substantial losses in the feedline on many bands.
- With a high-impedance (e.g. "450 ohm") balanced feedline to the
shack, and then either a balun/tuner or (I believe) a tuner designed
to feed a high-Z balanced line directly.
- Inductive match (i.e. base loading coil), presumably for a specific
band.
I would guess that the simple autotuners built into many HF rigs would
probably not have the range to handle this antenna on most bands...
they're usually limited to flattening out relatively low SWRs, to keep
the finals happy. You'll need some form of wide-matching-range tuner
(e.g. a good external "T" or "L" matching box) to handle the wide
range of impedances that this antenna is likely to present on various
bands.
--
Dave Platt <dplatt@radagast.org> AE6EO
Friends of Jade Warrior home page: http://www.radagast.org/jade-warrior
I do _not_ wish to receive unsolicited commercial email, and I will
boycott any company which has the gall to send me such ads!
GVBBS:KG6BAJ-1 Internet Newsgroup <-> Packet Radio Gateway Server
** InterPacketGATE V1.6 Beta INTERNET <-> PACKET Radio Gateway by NL1RSD **
Read previous mail | Read next mail
| |
