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Author Topic: 6m yagi selection....  (Read 5798 times)
N4UE
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Posts: 708




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« Reply #15 on: May 09, 2017, 05:19:52 PM »

I wrote a piece in CQ VHF many years ago about converting the 5 el CC 50 MHz yagi into a 6 el wide spaced model. I used a program from NBS to optimize for either fwd gain or f/b ratio. Since I lived on a farm in the country, I went for max gain.
The results were great. I regret selling it when I moved, I later bought an M2 JHV. It has survived several moves, how, I have no idea because it's the most flimsy antenna I've ever had.
Later M2 came out with a HD version of this antenna. Look at the Reviews section........
I had (and still use use) 4 VHF antennas made by KLM, and they (IMHO) are much more rugged.
One of the same owners, K6MYC......

ron
N4UE
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K3GM
Member

Posts: 2227




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« Reply #16 on: May 09, 2017, 05:38:43 PM »

Another model I'm curious about is G0KSC designed  Loop Fed Yagi models being constructed by Hy-Gain under license from Innovantenna.   They appear to be decently constructed and of course employ their nice boom to mast clamp.
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KB1GMX
Member

Posts: 1505




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« Reply #17 on: May 12, 2017, 01:23:16 PM »

Someone else wrote for QST a mod to the A505S to extend the boom.

The article was by Bill Van Alstyne W5WVO May 2005, and starts with a
rock stock and only mediocre Cushcraft A505S 5 element and adds the
needed (really needed) boom length and resets the element size to
make a soso antenna into a truly good 5 element.  I ran the models
for before and after and the after is a significant  improvement.

Its a mechanically strong antenna and runs ok with ice.  They can be
had cheap used. 

I'm not a fan of M2 antennas, They are built well and offer very good
gain but they do not work with ice on them and they are too narrow
banded.  There is a world, largely unused, above 50.300 and the
M2 5-7 element antennas do not go there.

Why I say this...  A few years back we had heavy ice during the
January VHF/UHF contest  and until it melted the usual suspects
with M2 were off the air due to high SWR or really weak compared
to usual.  I was able and some of the others with antennas from
other sources were doing well or at lest functional. 

Here we get snow and ice so it s an issue.


Allison
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K3GM
Member

Posts: 2227




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« Reply #18 on: May 12, 2017, 04:37:24 PM »

Yo Allison, I've worked you in the contests.  So is retuning the gamma match problematic, or is it simply a matter of following the modification instructions?  I'm about to take the 5 element down along with the towers as we prepare to move from FN32 to FM29, so this would be a good time to do the mod. and spend the savings on something else at Dayton next week.

I just checked DX Engineering, $11.50 for pre-slit tubing, and $31.00 to ship it.  Dream on!
« Last Edit: May 12, 2017, 04:57:13 PM by K3GM » Logged
K3GM
Member

Posts: 2227




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« Reply #19 on: May 12, 2017, 05:05:22 PM »

......and Texas Towers wants $30.00.  I'll spend $500 on a new antenna, and get free shipping before I give them $30.00 to ship an $11.00 piece of tube. Sheesh!
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K3GM
Member

Posts: 2227




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« Reply #20 on: May 12, 2017, 05:43:08 PM »

How about two 3' pieces of tube with a short joiner tube?  I can get that shipped for $13.00
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ND6M
Member

Posts: 568




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« Reply #21 on: May 13, 2017, 10:59:13 AM »

Gee, some where in the boneyard, one just might find a 60" piece of boom material.
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K3GM
Member

Posts: 2227




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« Reply #22 on: May 13, 2017, 01:14:07 PM »

Gee, some where in the boneyard, one just might find a 60" piece of boom material.
Wrong bones, Jim. 1.25" and 1.625" are all I've got, ironically all broken booms  I've got a call into a kinda local aluminum supplier and should hear something on Monday. I've bought from them before and they did a cash sale right at the lobby desk.
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KB1GMX
Member

Posts: 1505




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« Reply #23 on: May 13, 2017, 09:58:23 PM »

Hi,

Retuning the gamma is not bad a MFJ259B made it easy and using
the point it up trick saved lower/raise the tower exercise.  The starting
dimension works and moving the element a tad also make it all dial in.
Measure accurately.

It seems effective...Wink  A few ops in the region use one.

I sprayed the gamma was liquid tape after wraping it with scotch 33
to protect it. The Al joints had a dab of penetrox.

As to a piece of aluminum, yes it cost me 18$, but it had friends in the box
for other antenna projects (.25 rod, .375 tube, and others along with some
resin clamps).

Allison
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KG7NXH
Member

Posts: 51




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« Reply #24 on: May 20, 2017, 07:47:40 PM »

Another model I'm curious about is G0KSC designed  Loop Fed Yagi models being constructed by Hy-Gain under license from Innovantenna.   They appear to be decently constructed and of course employ their nice boom to mast clamp.


I have a 4 element G0KSC design made my Hy-Gain.  In fact I was the first US customer.  I am happy with the antenna - a couple things I don't like about the construction but performance seems good and F/B seems up to spec as well.

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K3GM
Member

Posts: 2227




Ignore
« Reply #25 on: May 23, 2017, 07:43:09 AM »

Hi,

Retuning the gamma is not bad a MFJ259B made it easy and using
the point it up trick saved lower/raise the tower exercise.  The starting
dimension works and moving the element a tad also make it all dial in.
Measure accurately.

It seems effective...Wink  A few ops in the region use one.

I sprayed the gamma was liquid tape after wraping it with scotch 33
to protect it. The Al joints had a dab of penetrox.

As to a piece of aluminum, yes it cost me 18$, but it had friends in the box
for other antenna projects (.25 rod, .375 tube, and others along with some
resin clamps).

Allison
Thanks, Allison.  I ordered the tubing today, and will set this up at the new QTH in the near future where I'll be working you from FM29.
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N2LEE
Member

Posts: 8




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« Reply #26 on: May 31, 2017, 09:17:39 PM »

I looked at both and for my needs I decided to go with the Directive System 5 element 6 meter antenna.

I spoke with a number of friends who work a lot EME / MS they all raved about both Terry, W8ZN and his antennas. Also, after doing a little research I discovered Terry is an avid VHF/UHF contester. Apparently he likes to work as a Rover in the contest. This tells me they guy eats his own dog food. Which means he uses his own products and is extremely active.

Anyway, I am picking up a DSEJX5-50 this weekend at the Manassas Va, hamfest and will see if all of the glowing reviews hold true for my setup.

See you guys on 6m msk144 !

http://directivesystems.com/50-mhz/dsejx5-50/
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K3GM
Member

Posts: 2227




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« Reply #27 on: June 01, 2017, 09:38:35 AM »

I've used Directive Systems antennas before when K1WHS was the owner, and they were built very nice.  Just make sure that if you have to do any soldering on the shorting bars, or feedline attachment (and you may) that it's done with a high content silver solder.  I made the mistake of using plain old tin/lead and it turned to powder in a couple of years causing the shorting bar to open...... at the top of the stack of course.
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W2UIS
Member

Posts: 117




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« Reply #28 on: June 08, 2017, 04:09:28 AM »

I just installed the Diamond A502HB 2 element antenna. This antenna is a good alternative to be active on 6 meters in a small package. Inexpensive, easy to assemble (no tools required), small, and light weight. Mounted at 20 feet I made 3 contacts with stations 1000 miles away.

A perfect antenna for portable operations too.
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W4KVW
Member

Posts: 69




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« Reply #29 on: June 09, 2017, 08:34:00 PM »

An M2 6M7JHV is just a couple of dollars more than the 6M5XHP just FYI.I love my 6M5X (Old Model 5 element) & I know nothing about Directive Systems. M2 has been a proven WINNER in the VHF/UHF Contest world for many years & the quality of the antennas is AWESOME! If I even need an New VHF or UHF antenna for any band I would NOT hesitate at buying another M2.They work & they work very well.

Clayton
W4KVW
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