Call Search
     

New to Ham Radio?
My Profile

Community
Articles
Forums
News
Reviews
Friends Remembered
Strays
Survey Question

Operating
Contesting
DX Cluster Spots
Propagation

Resources
Calendar
Classifieds
Ham Exams
Ham Links
List Archives
News Articles
Product Reviews
QSL Managers

Site Info
eHam Help (FAQ)
Support the site
The eHam Team
Advertising Info
Vision Statement
About eHam.net

   Home   Help Search  
Pages: [1] 2 Next   Go Down
  Print  
Author Topic: Best Triband 3 to 4 element trapped Yagi?.  (Read 7727 times)
ZS5WC
Member

Posts: 411


WWW

Ignore
« on: September 17, 2011, 07:58:33 AM »

 Smiley
I am on a quest for find the best Bang for Buck, lightweight , trapped 3 to 4 element yagi, low SWR across the CW and Phone section, good gain--F/B is not that important.
Should cover 20 / 15 and 10m..And Handle about a KW.

Now I know what I am describing is an IDEAL antenna--but what are your experiences?..

I love CREATE antennas , but support for them in Africa is non-existent!..

73 de William
ZS4L /\ZS5WC
Logged
WB2WIK
Member

Posts: 20603




Ignore
« Reply #1 on: September 17, 2011, 08:11:38 AM »

You can probably get antennas from the US, EU and AUS (I would guess), don't know if anything's made in South Africa or not -- if so, they're not on the market here.

For 3-4 element "good bang for the buck" I've always liked the Cushcraft A4S.  It's 18' long and optimized for 10m better than most 3L tribanders could be due to compromised spacing attempting to cover three bands.  It's also quite strong, I've had two of them up over the years through horrendous storms without any problems at all.

A 3L or 4L SteppIR is better, but quite a lot more expensive.


Logged
ZS5WC
Member

Posts: 411


WWW

Ignore
« Reply #2 on: September 17, 2011, 09:25:19 AM »

 Smiley Hi Steve,

I have been looking at the A4S and it is of similar design to my Create 318JR--which has a parasitic element for 10, but still only has 3 active elements on 10m.
Some reviews on the A4S have been poor--some reported a daily change of in band SWR?..
Wonder if you found the Same.
No, we don't manufacture HF Beams in South Africa-I suspect we export the Aluminium so other manufacturers can build them elsewhere--Hi!..
Pity, maybe something I should look into..

My current antenna is the CREATE 318jr--GREAT antenna--I work DX with a 100w with ease, and bust pileups with the same wattage, BUT--IF I need trap covers, or other bits--what then?.
There are PLENTY suppliers in OZ that sell Create--BUT FLATLY REFUSE to ship overseas!..Great pity , because their prices are OK.
Maybe someone from VK can point me to a supplier that will ship to Africa..
For interest: here is a link to a nice TET-EMTRON TE-33 ant..
http://www.tet-emtron.com/TE-33-p/te-33.htm
Logged
ZS5WC
Member

Posts: 411


WWW

Ignore
« Reply #3 on: September 17, 2011, 09:33:17 AM »

Further to my post above ..(Cont.)
Here is a link to the CREATE 318JR data:
http://www.houseofradio.gr/modules.php?name=catalog&file=popup_image&pID=974&image=0

I do fancy the STEPPIR !!--BUT Weight, Self supporting tower, light rotator and Budget are all limiting factors at this stage.

Pity Sommerbeam is out of business as I fancied that dual driven element design--flattening the SWR..

73 de William
ZS4L / ZS5WC
Logged
AA4PB
Member

Posts: 12854




Ignore
« Reply #4 on: September 17, 2011, 09:51:27 AM »

My only problem with an A3 (about 20 years ago) was SWR change with the 40M add-on. On cool mornings condensation would form on the big add-on traps and cause the SWR to be high on 40M. If I went key-down on 100W CW I could watch the SWR slowly drop as the traps heated up. Unkey and wait a few minutes then key up and the SWR would be high again because of more condensation on the traps. About noon the sun was hot enough that the traps dried out and SWR was good and constant. I never saw this problem on 10/15/20 meters - only 40M.

I then went to a Mosely TA33 with 40M add-on and never had that problem (maybe because of the larger traps and wider bandwidth). I understand that Mosleys are hard to get nowdays.
Logged
WB2WIK
Member

Posts: 20603




Ignore
« Reply #5 on: September 17, 2011, 12:53:38 PM »

I never had any problems of any kind with my A4S's (both of them).  SWR never changed, traps never failed, ran 1500W lots of times including high duty cycle operations in contests, and even RTTY.

I always suspect when people have problems there may have been a factory defect (anything's possible) but more likely they just did something wrong. Tongue

We had one of these up 80' above ground over a hilltop in northwestern NJ for many years and it worked great for many years.  Took it down and replaced it with a Force-12 C3 which actually did not work as well and regretted that change.  Took down the C3 and put the A4S back up. Cheesy
Logged
AA4PB
Member

Posts: 12854




Ignore
« Reply #6 on: September 17, 2011, 01:10:22 PM »

Note that I said the problem was with the A3 40M add-on kit. Did you have a 40M add-on on your A4s and did you try to operate them during the cool early morning hours when there was condensation on everything? At the time I liked to work DX on 40 CW as the sun was comming up.

I'm sure lots of people use them with no issues. Its just that in my particular location in this particular Wx condition I had an issue with it. And yes, the water drip holes were on the bottom of the traps.  Grin

Logged
WB2WIK
Member

Posts: 20603




Ignore
« Reply #7 on: September 17, 2011, 06:40:41 PM »

Note that I said the problem was with the A3 40M add-on kit. Did you have a 40M add-on on your A4s and did you try to operate them during the cool early morning hours when there was condensation on everything? At the time I liked to work DX on 40 CW as the sun was comming up.

I'm sure lots of people use them with no issues. Its just that in my particular location in this particular Wx condition I had an issue with it. And yes, the water drip holes were on the bottom of the traps.  Grin



Can't say that I did that.  I had the 40m add-on kit here in L.A. and it never had any problems, but we have close to no humidity and also close to no rain.  Back east when I had an A4S in NJ,, I did not have the 40m extender elements and 20m traps at all.
Logged
N6EY
Member

Posts: 107


WWW

Ignore
« Reply #8 on: September 17, 2011, 10:55:50 PM »

It's not trapped - actually, it's linear loaded - but you might want to check out the M2 (M-squared) KT-34M2.
Logged

________________________________
73,
Jason N6EY
________________________________
ZS5WC
Member

Posts: 411


WWW

Ignore
« Reply #9 on: September 18, 2011, 12:15:17 AM »

 Smiley

Thanks for the replies / suggestions so far--seems the A4S is pretty good in all--one just has to be careful with the add on kit.. I have often wondered how one could keep the antenna WARMER than the surrounding air , to prevent condensation..--perhaps heat tracing along the boom--hopefully the heat will reach the outer extremities of the antenna..
Believe it or not , last winter we had 3 heavy snowfalls here in Africa--no moisture issues though.

I do like the KT34 as well, the linear loading is really neat, and I speak to K6MYC on occasion via 40m using his antennas--so I know his products do work!.. The Gain figures are lower than expected, but I guess all the other antenna manufacturer figures could be slightly inflated..

73 de William
ZS4L / ZS5WC
Logged
VK4SP
Member

Posts: 1




Ignore
« Reply #10 on: September 18, 2011, 03:02:34 PM »

Smiley Hi Steve,

I have been looking at the A4S and it is of similar design to my Create 318JR--which has a parasitic element for 10, but still only has 3 active elements on 10m.
Some reviews on the A4S have been poor--some reported a daily change of in band SWR?..
Wonder if you found the Same.
No, we don't manufacture HF Beams in South Africa-I suspect we export the Aluminium so other manufacturers can build them elsewhere--Hi!..
Pity, maybe something I should look into..

My current antenna is the CREATE 318jr--GREAT antenna--I work DX with a 100w with ease, and bust pileups with the same wattage, BUT--IF I need trap covers, or other bits--what then?.
There are PLENTY suppliers in OZ that sell Create--BUT FLATLY REFUSE to ship overseas!..Great pity , because their prices are OK.
Maybe someone from VK can point me to a supplier that will ship to Africa..
For interest: here is a link to a nice TET-EMTRON TE-33 ant..
http://www.tet-emtron.com/TE-33-p/te-33.htm

you could try Les at Amateur Transceiver Radio centre www.atrc.com.au
He should be able to help you out
Logged
ZS5WC
Member

Posts: 411


WWW

Ignore
« Reply #11 on: September 19, 2011, 10:53:01 AM »

Hi David, Wink
Thanks for honouring me with your very first post on e-ham.net!..

I will certainly check out the ATRC website, perhaps we will be lucky.
I am out and about at the moment, in a months' time I will be at the QTH again, hope to work some VK's again long path on 20m!..

73 de William
ZS4L / ZS5WC
Logged
NN4F
Member

Posts: 51




Ignore
« Reply #12 on: September 19, 2011, 02:09:23 PM »

Take a look at the Mosley TA-63M  6 band 6 element, 4 large trapped elements and two small 6m elements, it performs real well and gives you gain on 12/17 also compared to many that have a dipole on 12/17..FB is a little low, but that can be an advantage, at least you can hear signals off the back, albeit a little lower..

I get some great signal reports since i started using it even running 100w...
Logged
KF7CG
Member

Posts: 836




Ignore
« Reply #13 on: September 19, 2011, 02:54:57 PM »

I second the Mosley brand. I have to get my ancient TA33 back up. It has been moved all over the US was bought second hand in the late 70's and until I took it down for the ?? time to move was still performing well.

Only three bands but good gain and a very nice f/b ratio.

KF7CG
Logged
KA7NIQ
Member

Posts: 258


WWW

Ignore
« Reply #14 on: January 18, 2013, 11:56:20 PM »

I think the Hy Gain Explorer 14 is a great Triband Yagi, and also has the 40 meter add on kit option.
It is the only tribander I know of on a 14 ft boom, that has a separate, full size, 10 meter reflector. It also has dual non trapped 10 meter driven elements, so on 10 meters, the only traps are in the director.
The dual 10 meter driven elements mean there is only a 15 meter trap in the 20 meter driven element.
And because of the separate and full size 10 meter reflector, it allowed Hy Gain to better optimize 15 and 20, since they no longer had to worry as much about 10.

Built like a tank, the Hy Gain Explorer 14 has no real competition IMHO, for a triband Yagi on a 14 ft boom.

FWIW, It has a 4.9 review rating out of 5 on the EHAM Reviews.



Logged
Pages: [1] 2 Next   Go Up
  Print  
 
Jump to:  

Powered by MySQL Powered by PHP Powered by SMF 1.1.11 | SMF © 2006-2009, Simple Machines LLC Valid XHTML 1.0! Valid CSS!