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123

Rick McClelland, AA5S

Re: cobweb antenna

Maybe a quick email to Balun Designs could produce a better quality
matching network for the R5? This crossed my mind earlier today and I
wonder if this is a reasonable way to make the R5 a decent antenna for the
higher bands.

On Fri, May 31, 2013 at 11:25 AM, David Gilbert <[hidden email]>wrote:

>
> Having once owned an R-5, and having opened the "matching network" box to
> see what's inside it, I'd take the cobweb antenna over the R-5 for
> performance any day.
>
> Dave AB7E
>
>
>
>
> On 5/31/2013 3:35 AM, Bill wrote:
>
>> For the rather rare times I operate on the "DX" bands, I use a Cushcraft
>> R5 (five bands 10-20). Much smaller foot print than a cobweb style antenna.
>> Has been up for over twenty years and is still going.
>>
>> Bill W2BLC
>>
>
> ______________________________**______________________________**__
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>
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>

--
Rick McClelland, AA5S
Fort Collins, CO
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Jim Brown-10

Re: EARC End Fed 6-40 question (Was Re: cobweb antenna)

In reply to this post by Jeff Ellis

On 5/31/2013 12:35 PM, Jeff Ellis wrote:
> Will adding a number of ferrite on the feed line help choke the RF? Will winding the feed line around a tube to make an air choke work? I guess that one is cheep enough I should just try it. Buying 10 or more ferrite to clamp to the line costs more;)

Wrong approach to chokes. Study http://k9yc.com/RFI-Ham.pdf and all
the Power Point on Coax Chokes at http://k9yc.com/publish.htm

> What about using a longer feed line? I really don't want to add a counterpoise and the instructions said it does not need one. I could use the 30' antenna wire it came with if that is going to help. I would not think so since its resonate on so many bands and tunable on the others.

I don't know what antenna you're talking about, but ALL end fed wires
and nearly all verticals need some sort of counterpoise, regardless of
what someone trying to sell you their antenna tells you to the contrary.
It's simple physics. The fact that you don't have one is probably why
you have "RF in the shack" -- the return current for that wire has
nowhere else to go except back down into your rig.

Also, an antenna that ends in the shack will usually put a lot of RF in
the shack if it's working well as antenna. That's its job -- it's
INTENDED to radiate, and any antennas near it (your USB cable, other
computer cables, audio cables to the computer, mic cables) will act as
receiving antennas, and the received RF will be coupled into equipment
by Pin One Problems (improper termination of cable shields). The
solution is to choke those unintentional antennas. Again, see the RFI
tutorial.

Another issue, if you're using a K2, is that the serial cable that was
built from instructions (and the parts provided) used parallel
conductors rather than twisted pair. That was a VERY poor design choice
-- parallel conductors are very susceptible to RF and other noise, and
twisted pair inherently rejects RFI and noise. That's why CAT5/6/7
cable is twisted pair.

73, Jim K9YC
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Jay Kobelin

Re: RX and TX equalizers

In reply to this post by Jay Kobelin

Solved

Just need to change the modes on the K3 and resend the settings to the K3
after changing modes .. just a mouse click away!

Jay

----- Original Message -----
From: "Jay" <[hidden email]>
To: <[hidden email]>
Sent: Friday, May 31, 2013 12:20 PM
Subject: [Elecraft] RX and TX equalizers

> Is there a way to set these once for a mode and have it do it to the
> remaining all applicable modes? I have 6 K3s here and that's a lot of
> settings.
>
> I do have the K3EZ working which makes it easier.
>
> Any tricks or just need to plow thru them all?
>
> Kinda curious
> Tnx
> Jay
> ______________________________________________________________
> Elecraft mailing list
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Don Wilhelm-4

Re: cobweb antenna

In reply to this post by Vic Rosenthal

That is not a reasonable statement at all.
It may be that bringing the ends of the dipole close together will allow
it to be placed close to those objects without the normal de-tuning
effects, but to state that those objects will not absorb radiated power
is a real stretch of the imagination.

73,
Don W3FPR

On 5/31/2013 2:59 PM, Vic K2VCO wrote:

> Theoretically, performance should be similar to a dipole, although
> with a near-omnidirectional pattern (and of course reduced bandwidth).
> It might be perfect for certain antenna-restricted circumstances.
>
> There is a statement on the G3PTW website which is interesting, and I
> would like to hear what others say about this:
>
> "The confined electric near field (caused by the high impedance ends
> of each dipole being close to each other) also ensures that the
> antenna does not couple to other electrical conductors i.e. telephone
> wires, power cables, television antennas or even the ground and lossy
> di-electrics such as trees and buildings. Thus the radiated power is
> not absorbed by nearby objects, it is all radiated into free space.
> Breakthrough and noise pick up are also reduced to an absolute minimum
> and the ground conductivity and height do not affect the antenna tuning."
>
> Does this sound reasonable?
>
> On 5/31/2013 10:46 AM, Yngvi (TF3Y) wrote:

Joe Subich, W4TV-4

Re: cobweb antenna

In reply to this post by Rick McClelland, AA5S

The R5/R6000 does not need a "better quality matching network."
If you want to replace the capacitors with something a bit beefier
that's fine. Otherwise, an external common mode choke might offer
marginally better feedline decoupling than the common mode choke
already included in the R5/6000/7/8 matching network but there is
absolutely nothing "wrong" with the stock matching network as long
as the user does not force power into it on a band that is is not
designed to cover (e.g. 80 meters - or 40/30 on the R5/R6000).

73,

... Joe, W4TV

On 5/31/2013 3:51 PM, Rick McClelland, AA5S wrote:

> Maybe a quick email to Balun Designs could produce a better quality
> matching network for the R5? This crossed my mind earlier today and I
> wonder if this is a reasonable way to make the R5 a decent antenna for the
> higher bands.
>
>
> On Fri, May 31, 2013 at 11:25 AM, David Gilbert <[hidden email]>wrote:
>
>>
>> Having once owned an R-5, and having opened the "matching network" box to
>> see what's inside it, I'd take the cobweb antenna over the R-5 for
>> performance any day.
>>
>> Dave AB7E
>>
>>
>>
>>
>> On 5/31/2013 3:35 AM, Bill wrote:
>>
>>> For the rather rare times I operate on the "DX" bands, I use a Cushcraft
>>> R5 (five bands 10-20). Much smaller foot print than a cobweb style antenna.
>>> Has been up for over twenty years and is still going.
>>>
>>> Bill W2BLC
>>>
>>
>> ______________________________**______________________________**__
>> Elecraft mailing list
>> Home: http://mailman.qth.net/**mailman/listinfo/elecraft<http://mailman.qth.net/mailman/listinfo/elecraft>
>> Help: http://mailman.qth.net/mmfaq.**htm<http://mailman.qth.net/mmfaq.htm>
>> Post: mailto:[hidden email].**net <[hidden email]>
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>>
>
>
>

Jay Kobelin

bat min

In reply to this post by Jay Kobelin

BAT MIN not showing up in config menu on some of the 6 K3 radios.

Firmware latest (4.67, 2.81, 1.15)

Jay
W2IJ

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mzilmer

Re: bat min

You might have to enable TECH MD for settings like this one.

Matt Zilmer, W6NIA
Semper Gumby

-----Original Message-----
From: [hidden email] [mailto:[hidden email]] On Behalf Of Jay
Sent: Friday, May 31, 2013 2:34 PM
To: [hidden email]
Subject: [Elecraft] bat min

BAT MIN not showing up in config menu on some of the 6 K3 radios.

Firmware latest (4.67, 2.81, 1.15)

Jay
W2IJ

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Greg - AB7R

Re: bat min

BAT MIN is not a TECH MD item.

73
Greg

On 5/31/13, [hidden email] <[hidden email]> wrote:

> You might have to enable TECH MD for settings like this one.
>
> Matt Zilmer, W6NIA
> Semper Gumby
>
>
>
> -----Original Message-----
> From: [hidden email]
> [mailto:[hidden email]] On Behalf Of Jay
> Sent: Friday, May 31, 2013 2:34 PM
> To: [hidden email]
> Subject: [Elecraft] bat min
>
> BAT MIN not showing up in config menu on some of the 6 K3 radios.
>
> Firmware latest (4.67, 2.81, 1.15)
>
> Jay
> W2IJ
>
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>

Bill Blomgren

Re: cobweb antenna

In reply to this post by Rich Ardolino

Exactly - Not sure what is going on with the "commercial" version's guy... I suspect that is a side venture, and 'real work' probably has him tied up.

It's either that, or he doesn't want to fight with exchange rates, shipping out of olde blighty, and all that stuff.

That said.. I'm wondering if there are other baluns that might have better performance up as far as say 6 meters... <heh> - allowing a 6th band...
----- Original Message -----
From: [hidden email]
To: Bill Blomgren
Cc: [hidden email]
Sent: Friday, May 31, 2013 6:54 AM
Subject: Re: [Elecraft] cobweb antenna

Hello Bill,

I have no intent to denigrate the design and functionality of the "Cobweb" style antenna but.........

Several years ago I was inclined to acquire the G3TPW commercial version of the "CobWebb" antenna, I found the website ( www.g3tpw.co.u ) and sent an email asking how to order, method of payment & shipping charges, etc. Got no response......I thought maybe there was some problem with the 1st email attempt so I sent another.....still no response. So I sent an inquiry via regular mail, including a self addressed (with postage) return envelope......no reply whatsoever.......

So I can't comment on how well the G3TPW version functions......but in consideration of my above described experience, maybe you should limit your effort to a homebrew version.

Also, later I had good results with the homebrew version of the Buddipole, built from free instructions on W3FF's homepage ( https://sites.google.com/site/w3ffhomepage/ ). But back then I was doing more portable ops and since the commercial version is more sturdy I decided to get one......saw one being offered on ebay so I bid and won the auction. Eventually I lost one small bit and needed a replacement part so I contacted W3FF and got very fast response....even though I hadn't purchased direct from them.

So I've decided customer service is just as important as functionality when deciding which products to acquire. Just my opinion...............

Rich K2CPE

K2 #1102

------------------------------------------------------------------------------

From: "Bill Blomgren" <[hidden email]>
To: [hidden email]
Sent: Thursday, May 30, 2013 10:27:22 PM
Subject: [Elecraft] cobweb antenna

I'm still in the "pre-purchase" stage.. but I'm sort of thinking that the K3
is where I'm going to end up.. Possibly with the preamp...and then there is
the big problem: what to make it to the air with.....

The idea of starting off with the buddipole system is out there - and very
possible...

I've also been reading up on the plusses and minuses of many of the
alternatives that may be possible in an apartment life...

One is the magnetic loop - which is a tad pricey with the vac. variable --
lots of copper, and the need to tune the thing every time you change
frequency - and not just antenna tuner stuff - as in changing the cap on the
antenna itself. It is a very high q (and thus voltage and current)
critter...Rube Golberg figured out how to do that.. motors with long screw
drives into a sealed box with the cap inside..with very high voltages
there... and thus requiring altitude for safety..

I came across a nifty square thing called a cobweb, which is more or less
semi-flat over 4-5 bands... is very light..and can be made of pvc pipe or
possibly fiber glass because it just has 5 wires in a big square.. One
antenna to cover 20 17 15, 12 and 10 meters sounds interesting.. One of the
designs even works on 6, but has higher losses... (That may be the baluns
they use for a 4-1 impedance match and to go unbalanced...

Has anyone tried one of these critters, and if so, is the Elecraft happy
with it?

______________________________________________________________
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______________________________________________________________
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Jay Kobelin

Re: bat min

In reply to this post by mzilmer

Indeed !! TECH Mode now ON and voila..there it is

Thanks all.....

Jay

----- Original Message -----
From: <[hidden email]>
To: <[hidden email]>; <[hidden email]>
Sent: Friday, May 31, 2013 2:40 PM
Subject: RE: [Elecraft] bat min

Jay Kobelin

Re: bat min

In reply to this post by Greg - AB7R

TECH MD does toggle the BAT MIN on/off

----- Original Message -----
From: "Greg" <[hidden email]>
To: <[hidden email]>
Cc: <[hidden email]>; <[hidden email]>
Sent: Friday, May 31, 2013 2:43 PM
Subject: Re: [Elecraft] bat min

> BAT MIN is not a TECH MD item.
>
> 73
> Greg
>
>
> On 5/31/13, [hidden email] <[hidden email]> wrote:
>> You might have to enable TECH MD for settings like this one.
>>
>> Matt Zilmer, W6NIA
>> Semper Gumby
>>
>>
>>
>> -----Original Message-----
>> From: [hidden email]
>> [mailto:[hidden email]] On Behalf Of Jay
>> Sent: Friday, May 31, 2013 2:34 PM
>> To: [hidden email]
>> Subject: [Elecraft] bat min
>>
>> BAT MIN not showing up in config menu on some of the 6 K3 radios.
>>
>> Firmware latest (4.67, 2.81, 1.15)
>>
>> Jay
>> W2IJ
>>
>>
>> ______________________________________________________________
>> Elecraft mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:[hidden email]
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>> ______________________________________________________________
>> Elecraft mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:[hidden email]
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>>

Greg - AB7R

Re: bat min

In reply to this post by Jay Kobelin

That is strange and there must me an error in the current manual.
That was the first thing i checked and there is no [T] next to the BAT
MIN entry on the table in the manual.

Aaarghhhh....Sorry Matt!!

On 5/31/13, Jay <[hidden email]> wrote:

> Indeed !! TECH Mode now ON and voila..there it is
>
> Thanks all.....
>
> Jay
>
>
> ----- Original Message -----
> From: <[hidden email]>
> To: <[hidden email]>; <[hidden email]>
> Sent: Friday, May 31, 2013 2:40 PM
> Subject: RE: [Elecraft] bat min
>
>
>> You might have to enable TECH MD for settings like this one.
>>
>> Matt Zilmer, W6NIA
>> Semper Gumby
>>
>>
>>
>> -----Original Message-----
>> From: [hidden email]
>> [mailto:[hidden email]] On Behalf Of Jay
>> Sent: Friday, May 31, 2013 2:34 PM
>> To: [hidden email]
>> Subject: [Elecraft] bat min
>>
>> BAT MIN not showing up in config menu on some of the 6 K3 radios.
>>
>> Firmware latest (4.67, 2.81, 1.15)
>>
>> Jay
>> W2IJ
>>
>>
>> ______________________________________________________________
>> Elecraft mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:[hidden email]
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>

mzilmer

Re: bat min

In reply to this post by Jay Kobelin

Greg, were you thinkin' of the KX3? Oops - no TECH MD on the KX3!

Matt Zilmer
Semper Gumby

-----Original Message-----
From: [hidden email] [mailto:[hidden email]] On Behalf Of Jay
Sent: Friday, May 31, 2013 2:52 PM
To: [hidden email]
Subject: Re: [Elecraft] bat min

TECH MD does toggle the BAT MIN on/off

----- Original Message -----
From: "Greg" <[hidden email]>
To: <[hidden email]>
Cc: <[hidden email]>; <[hidden email]>
Sent: Friday, May 31, 2013 2:43 PM
Subject: Re: [Elecraft] bat min

______________________________________________________________
Elecraft mailing list
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Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[hidden email]

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______________________________________________________________
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Post: mailto:[hidden email]

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Chris, G5VZ

Re: cobweb antenna

In reply to this post by Bill Blomgren

I don't know exactly what G3TPW is doing these days but M0ZIM is selling
a commercial cobwebb: see
http://www.mcr666.com/sales1/ham-radio/4-meter-70-meg-base-vertical-antenna/cobwebb-antenna/

Usual disclaimers - I do have one of these antennas but otherwise no
interest in the operation. I think Mark will ship worldwide.

Chris
G5VZ / WG5VZ

On 31/05/2013 22:44, Bill Blomgren wrote:

> Exactly - Not sure what is going on with the "commercial" version's guy... I suspect that is a side venture, and 'real work' probably has him tied up.
>
> It's either that, or he doesn't want to fight with exchange rates, shipping out of olde blighty, and all that stuff.
>
> That said.. I'm wondering if there are other baluns that might have better performance up as far as say 6 meters... <heh> - allowing a 6th band...
> ----- Original Message -----
> From: [hidden email]
> To: Bill Blomgren
> Cc: [hidden email]
> Sent: Friday, May 31, 2013 6:54 AM
> Subject: Re: [Elecraft] cobweb antenna
>
>
> Hello Bill,
>
>
>
> I have no intent to denigrate the design and functionality of the "Cobweb" style antenna but.........
>
>
>
> Several years ago I was inclined to acquire the G3TPW commercial version of the "CobWebb" antenna, I found the website ( www.g3tpw.co.u ) and sent an email asking how to order, method of payment & shipping charges, etc. Got no response......I thought maybe there was some problem with the 1st email attempt so I sent another.....still no response. So I sent an inquiry via regular mail, including a self addressed (with postage) return envelope......no reply whatsoever.......
>
>
>
> So I can't comment on how well the G3TPW version functions......but in consideration of my above described experience, maybe you should limit your effort to a homebrew version.
>
>
>
> Also, later I had good results with the homebrew version of the Buddipole, built from free instructions on W3FF's homepage ( https://sites.google.com/site/w3ffhomepage/ ). But back then I was doing more portable ops and since the commercial version is more sturdy I decided to get one......saw one being offered on ebay so I bid and won the auction. Eventually I lost one small bit and needed a replacement part so I contacted W3FF and got very fast response....even though I hadn't purchased direct from them.
>
>
>
> So I've decided customer service is just as important as functionality when deciding which products to acquire. Just my opinion...............
>
>
>
> Rich K2CPE
>
> K2 #1102
>
>
>
>
>
>
>
>
>
> ------------------------------------------------------------------------------
>
>
> From: "Bill Blomgren" <[hidden email]>
> To: [hidden email]
> Sent: Thursday, May 30, 2013 10:27:22 PM
> Subject: [Elecraft] cobweb antenna
>
>
> I'm still in the "pre-purchase" stage.. but I'm sort of thinking that the K3
> is where I'm going to end up.. Possibly with the preamp...and then there is
> the big problem: what to make it to the air with.....
>
> The idea of starting off with the buddipole system is out there - and very
> possible...
>
> I've also been reading up on the plusses and minuses of many of the
> alternatives that may be possible in an apartment life...
>
> One is the magnetic loop - which is a tad pricey with the vac. variable --
> lots of copper, and the need to tune the thing every time you change
> frequency - and not just antenna tuner stuff - as in changing the cap on the
> antenna itself. It is a very high q (and thus voltage and current)
> critter...Rube Golberg figured out how to do that.. motors with long screw
> drives into a sealed box with the cap inside..with very high voltages
> there... and thus requiring altitude for safety..
>
> I came across a nifty square thing called a cobweb, which is more or less
> semi-flat over 4-5 bands... is very light..and can be made of pvc pipe or
> possibly fiber glass because it just has 5 wires in a big square.. One
> antenna to cover 20 17 15, 12 and 10 meters sounds interesting.. One of the
> designs even works on 6, but has higher losses... (That may be the baluns
> they use for a 4-1 impedance match and to go unbalanced...
>
> Has anyone tried one of these critters, and if so, is the Elecraft happy
> with it?
>
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>

mzilmer

Re: bat min

In reply to this post by Greg - AB7R

:) No worries. I was just guessing. I'm nowhere near the K3 right now...

Matt

-----Original Message-----
From: [hidden email] [mailto:[hidden email]] On Behalf Of Greg
Sent: Friday, May 31, 2013 2:52 PM
To: Jay
Cc: [hidden email]
Subject: Re: [Elecraft] bat min

That is strange and there must me an error in the current manual.
That was the first thing i checked and there is no [T] next to the BAT MIN entry on the table in the manual.

Aaarghhhh....Sorry Matt!!

On 5/31/13, Jay <[hidden email]> wrote:

> Indeed !! TECH Mode now ON and voila..there it is
>
> Thanks all.....
>
> Jay
>
>
> ----- Original Message -----
> From: <[hidden email]>
> To: <[hidden email]>; <[hidden email]>
> Sent: Friday, May 31, 2013 2:40 PM
> Subject: RE: [Elecraft] bat min
>
>
>> You might have to enable TECH MD for settings like this one.
>>
>> Matt Zilmer, W6NIA
>> Semper Gumby
>>
>>
>>
>> -----Original Message-----
>> From: [hidden email]
>> [mailto:[hidden email]] On Behalf Of Jay
>> Sent: Friday, May 31, 2013 2:34 PM
>> To: [hidden email]
>> Subject: [Elecraft] bat min
>>
>> BAT MIN not showing up in config menu on some of the 6 K3 radios.
>>
>> Firmware latest (4.67, 2.81, 1.15)
>>
>> Jay
>> W2IJ
>>
>>
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Don Wilhelm-4

Re: EARC End Fed 6-40 question (Was Re: cobweb antenna)

In reply to this post by Jeff Ellis

Jeff,

Your 70 ft of radiator wire is not a multiple of a halfwave on any
amateur bands, so it is not resonant within any ham band.
The web article does state that the coax length should be 18 feet, which
strongly implies that they are using the coax shield as part of the antenna.
Yes, a counterpoise is needed, and if you want to use the antenna as you
have it configured, I would suggest that you create a low impedance
either at your shack end or at the SO-239 jack at your UNUN. That low
impedance can be created by a quarter wavelength of wire for each band
you intend to operate. Tie the near ends of the wires together, and the
far ends should be fanned out away from the other wires. Treat the far
end of each wire as though it were the end of an antenna wire -
insulated and away from where people or pets might come in contact with
it - it will have a high RF voltage on it.
If you connect the near ends of the wires to the SO-239 jack shell, use
a current choke (often called a current balun) on the coax at that point.

If you bring the end of those counterpoise wires into the shack rather
than attaching to the SO-239, you may get by without a current choke.
The ends of those wires is the RF Ground for your shack - note that it
is not a safety ground which should be implemented as a heavy wire (#6
or larger) connected to driven ground rods, or at a minimum to the
utility entrance ground rod. If you drive extra ground rods, they must
be connected to the Utility entrance ground rod by a #6 or larger copper
wire.

The use of those counterpoise wires will likely change the tuning of
your antenna. Right now, it is using the coax and probably most of all
the equipment in your shack as a 'counterpoise' even though it may be
ineffective. You are effectively bringing part of the radiating antenna
into your shack.

73,
Don W3FPR

On 5/31/2013 3:35 PM, Jeff Ellis wrote:

> I got the kit John talks about and made the antenna. Its was quick and fun to make. I have a question about it though. I had a 70' wire that I had been using just for RX to test a IC-718 and I hooked it up to the UNUN box instead of the 30' wire that came with the kit. Its below 2:1 on 6m, 12m, 17m, 40m and less then 4:1 on 10, 20m, 80m and about 6:1 on 30m, 160m. The only really high one is 60m. So really all but 60m are tunable by the KX3 tuner board. I am using what I remember to be about 15' of RG-58/U. My Shack area is on the second floor of the house and the wire goes out my window and down to the back fence.
>
> My problem is I am getting RF coming back into the shack (on just 5W) where it will reset my USB hub a few feet away from the radio. Not fun when trying to work digital modes. This only happens on some bands but I know happens on 20m where I try and work the most. I expect its just the ones less resonate that its doing it on but I need to check again.
>
> Will adding a number of ferrite on the feed line help choke the RF? Will winding the feed line around a tube to make an air choke work? I guess that one is cheep enough I should just try it. Buying 10 or more ferrite to clamp to the line costs more ;)
>
> What about using a longer feed line? I really don't want to add a counterpoise and the instructions said it does not need one. I could use the 30' antenna wire it came with if that is going to help. I would not think so since its resonate on so many bands and tunable on the others.
>
> Thanks for the help!
>
>

N0AZZ

Re: EARC End Fed 6-40 question (Was Re: cobweb antenna)

In reply to this post by Jeff Ellis

Go back to the 30' length of wire that came with it and those problems will
be gone. Mine work's fine on most all the bands with a 31' fiberglass pole
as a vertical, sloper, dipole, Inverted L I have been 25' of coax on mine.

73,
Fred/N0AZZ

-----Original Message-----
From: [hidden email]
[mailto:[hidden email]] On Behalf Of Jeff Ellis
Sent: Friday, May 31, 2013 2:35 PM
To: [hidden email]
Subject: [Elecraft] EARC End Fed 6-40 question (Was Re: cobweb antenna)

I got the kit John talks about and made the antenna. Its was quick and fun
to make. I have a question about it though. I had a 70' wire that I had
been using just for RX to test a IC-718 and I hooked it up to the UNUN box
instead of the 30' wire that came with the kit. Its below 2:1 on 6m, 12m,
17m, 40m and less then 4:1 on 10, 20m, 80m and about 6:1 on 30m, 160m. The
only really high one is 60m. So really all but 60m are tunable by the KX3
tuner board. I am using what I remember to be about 15' of RG-58/U. My Shack
area is on the second floor of the house and the wire goes out my window and
down to the back fence.

My problem is I am getting RF coming back into the shack (on just 5W) where
it will reset my USB hub a few feet away from the radio. Not fun when trying
to work digital modes. This only happens on some bands but I know happens on
20m where I try and work the most. I expect its just the ones less resonate
that its doing it on but I need to check again.

Will adding a number of ferrite on the feed line help choke the RF? Will
winding the feed line around a tube to make an air choke work? I guess that
one is cheep enough I should just try it. Buying 10 or more ferrite to clamp
to the line costs more ;)

What about using a longer feed line? I really don't want to add a
counterpoise and the instructions said it does not need one. I could use the
30' antenna wire it came with if that is going to help. I would not think so
since its resonate on so many bands and tunable on the others.

Thanks for the help!

Jeff, K7GDE

On May 31, 2013, at 10:56 AM, John Saxon <[hidden email]> wrote:

> The "Emergency Amateur Radio Club" in Hawaii sells an antenna that has
worked for my needs. They sell a 30' length of wire and an UNUN fitted with
a SO-259. I got a 33' telescoping fiberglass pole from MFJ. I attached the
pole to my back fence (6' wooden). It only takes a couple of minutes to
attach the wire and host up the pole. Collapsing the pole also a couple of
minutes.
>
> The antenna is here...
> http://earchi.org/92011endfedfiles/Endfed6_40.pdf
> John
> K5ENQ

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KD8NNU

Re: cobweb antenna

In reply to this post by Bill Blomgren

I just built a cobweb last weekend and will get it up in the air this weekend. I built it for the omni pattern. I have uses a 1:4 balun single wire design for each band. I will give an update and comparison between my other three antennas later this weekend.

73
KD8NNU Don
Sent from my HTC on the Now Network from Sprint!

----- Reply message -----
From: "Don Wilhelm" <[hidden email]>
Date: Fri, May 31, 2013 5:14 pm
Subject: [Elecraft] cobweb antenna
To: <[hidden email]>

That is not a reasonable statement at all.
It may be that bringing the ends of the dipole close together will allow
it to be placed close to those objects without the normal de-tuning
effects, but to state that those objects will not absorb radiated power
is a real stretch of the imagination.

73,
Don W3FPR

On 5/31/2013 2:59 PM, Vic K2VCO wrote:

Rich Ardolino

Re: cobweb antenna

In reply to this post by Chris, G5VZ

Hi Chris,

The M0ZIM website clearly says , " PLEASE NOTE UK SALES ONLY NO EXPORT ". I'm guessing export sales from UK may entail too much "red tape" to bother with.......which seems a shame as I am an " anglophile".......

Regards,

Rich K2CPE

K2 #1102

----- Original Message -----

I don't know exactly what G3TPW is doing these days but M0ZIM is selling
a commercial cobwebb: see
http://www.mcr666.com/sales1/ham-radio/4-meter-70-meg-base-vertical-antenna/cobwebb-antenna/

Usual disclaimers - I do have one of these antennas but otherwise no
interest in the operation. I think Mark will ship worldwide.

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Dr. William J. Schmidt, II

Re: cobweb antenna

Is this the Cobweb reflector now?

Dr. William J. Schmidt - K9HZ / J68HZ/ 8P6HK/ ZF2HZ

Owner - Operator
Big Signal Ranch
Staunton, Illinois

email: [hidden email]

-----Original Message-----
From: [hidden email] [mailto:[hidden email]] On Behalf Of [hidden email]
Sent: Friday, May 31, 2013 5:47 PM
To: G5VZ Chris
Cc: [hidden email]
Subject: Re: [Elecraft] cobweb antenna

Hi Chris,

The M0ZIM website clearly says , " PLEASE NOTE UK SALES ONLY NO EXPORT ". I'm guessing export sales from UK may entail too much "red tape" to bother with.......which seems a shame as I am an " anglophile".......

Regards,

Rich K2CPE

K2 #1102

----- Original Message -----

I don't know exactly what G3TPW is doing these days but M0ZIM is selling
a commercial cobwebb: see
http://www.mcr666.com/sales1/ham-radio/4-meter-70-meg-base-vertical-antenna/cobwebb-antenna/

Usual disclaimers - I do have one of these antennas but otherwise no
interest in the operation. I think Mark will ship worldwide.

______________________________________________________________
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123