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eHam Forums / Elmers / hex beams
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on: June 24, 2005, 08:48:29 AM
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Hello John,
I hope the answers are not too confusing.
Unfortunally there are a few comments which are simply not true.
The first real difference in antenna gain you get if you go from 1 to 2 elements. This will bring you about 4 db gain. Adding more elements result in about 1db gain/per element.
The hexagonal beam is a 2 element beam consisting of radiator and reflector. Multiband versions are comparable to interlaced yagis. So the 5 band hex from 20-10m is from the point of gain the same like the OB9-5 from Optibeam with the difference of size, weight and costs for bigger needed infrastructure. You have 5 x a 2 element with a common feeding line.
The difference between a hex and a 2 element steppir will be hardly noticable as it is about 1db and I would not bet that the steppir has the higher gain!
I have the opportunity to use many different antennas, like yagis, quads and also hexagonal beams at the same time.
I compared over months trap beams like A3S, A4S, FB33 etc. with hexagonal beams. No one of those 3 element trap beams brought better reports/results than a 2 element fullsize hexbeam. The hexagonal is always a fullsize as it has no shorted elements!
My 40m homemade hexagonal beam without own elements for 15m had no difference in receiving/transmitting to the beams like A3S or FB33. Those beams are 15m designs and I was radiating with the 40m elements. But even the model shows close to 6dBi (free space!).
We are talking about gain and not about F/B. Here the other antennas are of course better.
If I had to decide I never would go for the steppir, or a trap beam and especially not for a mini trap beam.
Only the idea of having moving parts in the antenna makes me nervous. And don't forget to compare weight, size and needed effort for the installation and of course the neighborhood factor.
My homemade 20.10m version ha 6kg and even the 40-15m multiband array has only 15 kg.
By the way... it is not to difficult to built a hexagonal beam yourself.
regards Holger
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eHam Forums / DXing / ED5AEF
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on: May 14, 2004, 07:35:39 AM
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send it via the buro
the spanish buro works fine.
regards Holger
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3
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eHam Forums / DXing / Transporting equipment overseas
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on: January 19, 2004, 06:18:06 PM
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DXpeditions often have the sensitive luggage at the hand (TRCVR/notebook). PA's are given as luggage but without tubes of course. Regarding the antennas ask your airline for free sport equipment. Many airlines have rules to transport additional sport equipment (10/20 kg extra) without extra charge.
regards Holger
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5
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eHam Forums / DXing / Logging Program & QSL card maker?
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on: January 20, 2003, 03:44:17 PM
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I'm using UCXLog. It is freeware, windows based, does not need to install dozens of dll's and makes no registry entries. It runs CW, SSB via sound card, has logbook and contest log parts, TX-control, maps (azimutal, great circle, with greyline)that shows your transmission path and the best QSL printing facilities I ever saw. You can print only datas or the whole card if you like. And Ben (DL7UCX) is very helpful. Download here: http://www.funkstation.info/portal/html/modules.php?op=modload&name=Downloads&file=index&req=viewdownload&cid=11Forum here: http://www.funkstation.info/portal/html/modules.php?op=modload&name=XForum&file=forumdisplay&fid=3regards Holger |
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6
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eHam Forums / DXing / ZL7C
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on: October 29, 2002, 08:38:31 AM
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Hello Vince,
please listen to a cw or rtty pile up. Nobody has the idea to call with the last 2 only. Everybody uses the full call sign. What K0RS told you is absolute correct.
I'm not a big DXpeditioner but I've done about 200.000 Q's over the past 10 years from all over the world and the last 2 callers cost you time and QSO's for others. It may be a useful way in a net operation but for a pile up it is a very bad decission. As long as I hear stations with full callsigns calling me (even if they are weaker and I cannot get the full call!) I try to change the report with them. And I'm doing less SSB every time because of those bad operation practises in SSB.
73 Holger
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9
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eHam Forums / Elmers / dbd and dbi question
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on: September 03, 2002, 11:22:04 AM
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But you have to notice a second sentence concerning ground and height. The influence of height and ground is important for the offered gain values.
At first an antenna is designed/modelled for free space. Here you will get the smallest gain values. If you add height and ground conditions to the model you quickly can get a few db more gain. So while comparing gain data look for the environmental comments.
73 Holger
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12
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eHam Forums / DXing / QSL card timing
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on: August 01, 2002, 03:54:45 AM
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If the country has a good HAM population the QSL-bureaus are the best (cheapest)way. If there is only a small number of HAM's even with a QSL-bureau in that country sending cards may be expensive even via the bureau. For example in Germany the costs for bureaus cards are paid with our membership fee.
Malta on the other side has a QSL bureau but every outgoing card costs about 10-15 UScent extra. So the Maltese HAM's prefer direct post and don't like to answer a contest via the bureau service.
Talking about the time needed for bureau cards I would say that within a year are 80% of the answered cards back to you.
Holger DL7IO
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14
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eHam Forums / Elmers / Yagi stacking
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on: June 28, 2002, 10:48:14 AM
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With 4 antennas it is easy. Take same length of cable from each antenna and put them together 2 in a row and then parallel with the other two and you will get the same feedpoint resistance.
But I can't see any reason to do so. I would prefer a stacked vertical (commercial) to have the same effect with less mechanical and electrical parts. I guess a X200 will bring the same results.
Holger
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