[TowerTalk] FOR SALE 80 m. 4 square relay unit, Formerly COLATCHCO / COMTEK
Steve Davis | Davis RF
sdavis at davisrf.com
Sun May 28 18:11:52 EDT 2023
Hello TTalkers,
I have a 4 Square relay box available which was produced by Colatchco, Inc. This circuit was then sold to Comtek, who ultimately sold to DX Engineering (I believe DXE made some modifications to the circuit). The relay box worked fine last time I used it. I worked many rare DX , including China, both long and short path on 75m. SSB, from MA.
It comes with Colatchco user info, and some extra plug in relays. And no manual, in shack, switch, but you will see in the info I have that is an easy switch to wire in.
Also, you will need (1/4) wave, RG 11. If you don't have that available I can provide that to you at a discount off list from my DAVIS RF co. Same for 180 degree 8X phase line.
This item is not part of DAVIS RF inventory, as we never sold these, because Colatchco sold direct. The unit is my personal property and payment would be made to me, not my company.
The current unit from DXE is advertised at close to $ 400.00 . I can sell this for $ 225.00 + ship., along with the documentation and extra relays .
I may have the switch for it, just a home made 4 way switch mounted on L bracket, nothing fancy, but it does what it is supposed to. I can't promise I can find that as it is at my Cape Cod house, which I moved a crap load of stuff to and little idea where it may be HI. No charge for it.
You will need to get 12 vdc to the unit, which sits in the center of the 4 square layout. And as I said, I can provide cable for you at discounted rate, as well as phase cutting of the cable to your designated freq. The phase cutting I would charge you only my cost on that (we outsource phase cutting due to small demand).
There is not a cover for the unit. It should not be hard to obtain one, or fabricate it yourself. Or you can simply mount it inside an upside down pale.
I will warranty the unit to work properly , as long as you test it within 15 days of receipt.
The price is firm, and shipping cost will be added ( its only about 2 lb.).
Cheers, Steve Davis K1PEK.
________________________________
From: TowerTalk <towertalk-bounces at contesting.com> on behalf of towertalk-request at contesting.com <towertalk-request at contesting.com>
Sent: Sunday, May 21, 2023 12:00 PM
To: towertalk at contesting.com <towertalk at contesting.com>
Subject: TowerTalk Digest, Vol 245, Issue 10
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Today's Topics:
1. Xm240 to moon (BRUCE FORD)
2. Re: Xm240 to moon (marsh at ka5m.net)
3. Re: Xm240 to moon - Link to W6NL_Moxon104.pdf (marsh at ka5m.net)
4. Re: Xm240 to moon - Link to W6NL_Moxon104.pdf (Leeson)
5. Re: Xm240 to moon - Link to W6NL_Moxon104.pdf (marsh at ka5m.net)
6. Glen Martin Addendum (Harry Pliscof)
----------------------------------------------------------------------
Message: 1
Date: Sat, 20 May 2023 14:53:35 -0500
From: BRUCE FORD <ks9u at aol.com>
To: TowerTalk at contesting.com
Subject: [TowerTalk] Xm240 to moon
Message-ID: <8CCF4972-C151-4414-8AFB-F7BBBA7DF5EC at aol.com>
Content-Type: text/plain; charset=utf-8
I know I am late (always) to this but downsizing and replacing the 160 ft rotating tower with a nice 3el 40 with a 70ft Tristao and a XM240. The band width is not so great and have been reading about this upgrade. I can find no actual pictures of the Moxon element fully constructed so I have to assume looking at tubing lengths each element is about 18ft in total or 9 a side from the boom. Sorry so stupid?just getting old I guess.If anyone has picture of element end constructed and mounted that would be great.
Thanks for any help
Bruce K9RO
------------------------------
Message: 2
Date: Sat, 20 May 2023 15:20:06 -0500
From: <marsh at ka5m.net>
To: "'BRUCE FORD'" <ks9u at aol.com>
Cc: <TowerTalk at contesting.com>
Subject: Re: [TowerTalk] Xm240 to moon
Message-ID: <001601d98b58$7867ed00$6937c700$@ka5m.net>
Content-Type: text/plain; charset="utf-8"
See attached.
Hope this helps.
Marsh KA5M
-----Original Message-----
From: TowerTalk <towertalk-bounces at contesting.com> On Behalf Of BRUCE FORD via TowerTalk
Sent: Saturday, May 20, 2023 2:54 PM
To: TowerTalk at contesting.com
Subject: [TowerTalk] Xm240 to moon
I know I am late (always) to this but downsizing and replacing the 160 ft rotating tower with a nice 3el 40 with a 70ft Tristao and a XM240. The band width is not so great and have been reading about this upgrade. I can find no actual pictures of the Moxon element fully constructed so I have to assume looking at tubing lengths each element is about 18ft in total or 9 a side from the boom. Sorry so stupid?just getting old I guess.If anyone has picture of element end constructed and mounted that would be great.
Thanks for any help
Bruce K9RO
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk at contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
------------------------------
Message: 3
Date: Sat, 20 May 2023 15:33:22 -0500
From: <marsh at ka5m.net>
To: "'BRUCE FORD'" <ks9u at aol.com>
Cc: <TowerTalk at contesting.com>
Subject: Re: [TowerTalk] Xm240 to moon - Link to W6NL_Moxon104.pdf
Message-ID: <090601d98b5a$52b9dc10$f82d9430$@ka5m.net>
Content-Type: text/plain; charset="utf-8"
The attachment didn't work, so here's the link:
http://www.k3lr.com/engineering/moxon/W6NL_Moxon104.pdf
Hope this helps.
Marsh KA5M
-----Original Message-----
From: TowerTalk <towertalk-bounces at contesting.com> On Behalf Of BRUCE FORD via TowerTalk
Sent: Saturday, May 20, 2023 2:54 PM
To: TowerTalk at contesting.com
Subject: [TowerTalk] Xm240 to moon
I know I am late (always) to this but downsizing and replacing the 160 ft rotating tower with a nice 3el 40 with a 70ft Tristao and a XM240. The band width is not so great and have been reading about this upgrade. I can find no actual pictures of the Moxon element fully constructed so I have to assume looking at tubing lengths each element is about 18ft in total or 9 a side from the boom. Sorry so stupid?just getting old I guess.If anyone has picture of element end constructed and mounted that would be great.
Thanks for any help
Bruce K9RO
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk at contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
------------------------------
Message: 4
Date: Sat, 20 May 2023 16:03:21 -0700
From: Leeson <leeson at earthlink.net>
To: marsh at ka5m.net, 'BRUCE FORD' <ks9u at aol.com>,
"towertalk at contesting.com" <towertalk at contesting.com>
Subject: Re: [TowerTalk] Xm240 to moon - Link to W6NL_Moxon104.pdf
Message-ID: <afdcee94-99d7-c768-99a0-5a2c07143a35 at earthlink.net>
Content-Type: text/plain; charset=utf-8; format=flowed
From W6NL: The history of this antenna begins with my 2003 antenna with
27-foot boom, designed for our 125 mi/h (200 km/h) winds. See
https://www.kkn.net/dayton2004/dayton-2004-antenna-forum.html This
antenna is still in use here. Copies were built by K5MR, K6KR, KZ1W and
others. The K5MR antenna is now at N4BAA.
In 2007, K3LR asked me to modify the design for less wind load than we
have here, for convenience to be built with available parts of the
Cushcraft XM240. See http://www.kkn.net/dayton2007/w6nl_ant.pdf and
http://www.k3lr.com/engineering/ The first try
www.k3lr.com/engineering/moxon/W6NL_Moxon104.pdf<http://www.k3lr.com/engineering/moxon/W6NL_Moxon104.pdf> was not quite strong
enough for the winds there, so a modified design was made in 2010 as
www.k3lr.com/engineering/moxon/W6NL_Mox_100.pdf<http://www.k3lr.com/engineering/moxon/W6NL_Mox_100.pdf> In 2012, W2SC asked me
to provide an updated design to use at 8P5A, see
www.k3lr.com/engineering/moxon/W6NL_Mox_Tube_100.pdf<http://www.k3lr.com/engineering/moxon/W6NL_Mox_Tube_100.pdf> For a discussion of
modeling this type of antenna, see
www.k3lr.com/engineering/moxon/W6NLMoxonModeling.pdf<http://www.k3lr.com/engineering/moxon/W6NLMoxonModeling.pdf>
These have been built by W1UJ and K1KP in a project of the Yankee
Clipper Contest Club, for their own use and for W2SC/8P5A. See
https://w1uj.net/Moxon/ Here you will find many files describing their
work to build these antennas. See particularly K1KP's Dayton talk
https://www.kkn.net/dayton2012/DaytonAntennaPaper05102012.pdf and
https://www.yccc.org/Scuttlebutt/2011/butt2011_10.pdf Also see
https://w1uj.net/Moxon/K1KP/readme.html
In 2014 I was asked by WE9V to update the design to account for some
minor errors he found in the wind calculations. Also, he wanted to make
his antenna from 6-foot (2-meter) lengths of tubing. The antenna was
finished in 2015, see https://www.we9v.com/antennas.htm The element
dimensions for this antenna are in WE9V Moxon 100 mi.pdf and Visio-Moxon
Cushcraft XM240 40M.pdf The dimensions from WE9V are here, from an email
from me to him near the end of his project:
"So in summary, an antenna making good use of XM-240, especially the
expensive bigger sections, has 99 mi/h survival and should have the same
electrical performance as the other W6NL-Moxons. The elements, all with
0.058" wall, are as follows for the reflector, which is the more
stressed element:
1-1/2"x72" EH and EA used as reinforcement, add new 1-1/4"x24" inside
1-3/8"x72" 42" exposed, with reinforcement inner 24"
1-1/4"x48" 45" exposed, EB
1-1/8"x48" 44" exposed, EC
1"x16" 13" exposed, half ED
7/8"x18" 14" exposed, new part
3/4"x6" Reinforced, new, to mount cross element
1/2"x48" 39" exposed , EF (could be more or less)
3/8"x36" 13.25" exposed, half EJ, for proper tip length
For the driven element:
1-1/2"x72" EH and EA used as reinforcement, add new 1-1/4"x18" inside
1-3/8"x72" 42" exposed, with reinforcement inner 15"
1-1/4"x48" 45" exposed, EB
1-1/8"x48" 44" exposed, EC
1"x16" 2" exposed, half ED
7/8"x18" 2" exposed, new part
3/4"x6" Reinforced, new, to mount cross element
1/2"x48" 39" exposed , EF (could be more or less)
3/8"x36" 32.5" exposed, EG, for proper tip length
I hope this is what you were looking for. My grandkids always tell me "TMI."
There are also commercial versions of my design, such as W3JK's JK402T
https://jkantennas.com/jk402t.html, see also
https://ac0c.com/main/page_acc_towersantennas_40m_stack.html The JK402T
has several clever mechanical features, such as the mounting bracket for
the cross elements. But it is expensive, so many hams prefer to build
from scratch. DX Engineering has been rumored to be considering offering
a kit based on my design, but nothing concrete at the moment.
73 de Dave, W6NL/HC8L/P40Q
On 5/20/23 1:33 PM, marsh at ka5m.net wrote:
> The attachment didn't work, so here's the link:
>
> http://www.k3lr.com/engineering/moxon/W6NL_Moxon104.pdf
>
> Hope this helps.
>
> Marsh KA5M
>
>
>
>
> -----Original Message-----
> From: TowerTalk <towertalk-bounces at contesting.com> On Behalf Of BRUCE FORD via TowerTalk
> Sent: Saturday, May 20, 2023 2:54 PM
> To: TowerTalk at contesting.com
> Subject: [TowerTalk] Xm240 to moon
>
> I know I am late (always) to this but downsizing and replacing the 160 ft rotating tower with a nice 3el 40 with a 70ft Tristao and a XM240. The band width is not so great and have been reading about this upgrade. I can find no actual pictures of the Moxon element fully constructed so I have to assume looking at tubing lengths each element is about 18ft in total or 9 a side from the boom. Sorry so stupid?just getting old I guess.If anyone has picture of element end constructed and mounted that would be great.
>
> Thanks for any help
>
> Bruce K9RO
> _______________________________________________
>
>
>
> _______________________________________________
> TowerTalk mailing list
> TowerTalk at contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk
>
> _______________________________________________
>
>
>
> _______________________________________________
> TowerTalk mailing list
> TowerTalk at contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk
>
------------------------------
Message: 5
Date: Sun, 21 May 2023 05:59:54 -0500
From: <marsh at ka5m.net>
To: <leeson at earthlink.net>
Cc: "'BRUCE FORD'" <ks9u at aol.com>, <towertalk at contesting.com>
Subject: Re: [TowerTalk] Xm240 to moon - Link to W6NL_Moxon104.pdf
Message-ID: <01b501d98bd3$60824250$2186c6f0$@ka5m.net>
Content-Type: text/plain; charset="utf-8"
Thank you Dave.
73,
Marsh KA5M
-----Original Message-----
From: Leeson <leeson at earthlink.net>
Sent: Saturday, May 20, 2023 6:03 PM
To: marsh at ka5m.net; 'BRUCE FORD' <ks9u at aol.com>; towertalk at contesting.com
Subject: Re: [TowerTalk] Xm240 to moon - Link to W6NL_Moxon104.pdf
From W6NL: The history of this antenna begins with my 2003 antenna with
27-foot boom, designed for our 125 mi/h (200 km/h) winds. See
https://www.kkn.net/dayton2004/dayton-2004-antenna-forum.html This
antenna is still in use here. Copies were built by K5MR, K6KR, KZ1W and
others. The K5MR antenna is now at N4BAA.
In 2007, K3LR asked me to modify the design for less wind load than we
have here, for convenience to be built with available parts of the
Cushcraft XM240. See http://www.kkn.net/dayton2007/w6nl_ant.pdf and
http://www.k3lr.com/engineering/ The first try
www.k3lr.com/engineering/moxon/W6NL_Moxon104.pdf<http://www.k3lr.com/engineering/moxon/W6NL_Moxon104.pdf> was not quite strong
enough for the winds there, so a modified design was made in 2010 as
www.k3lr.com/engineering/moxon/W6NL_Mox_100.pdf<http://www.k3lr.com/engineering/moxon/W6NL_Mox_100.pdf> In 2012, W2SC asked me
to provide an updated design to use at 8P5A, see
www.k3lr.com/engineering/moxon/W6NL_Mox_Tube_100.pdf<http://www.k3lr.com/engineering/moxon/W6NL_Mox_Tube_100.pdf> For a discussion of
modeling this type of antenna, see
www.k3lr.com/engineering/moxon/W6NLMoxonModeling.pdf<http://www.k3lr.com/engineering/moxon/W6NLMoxonModeling.pdf>
These have been built by W1UJ and K1KP in a project of the Yankee
Clipper Contest Club, for their own use and for W2SC/8P5A. See
https://w1uj.net/Moxon/ Here you will find many files describing their
work to build these antennas. See particularly K1KP's Dayton talk
https://www.kkn.net/dayton2012/DaytonAntennaPaper05102012.pdf and
https://www.yccc.org/Scuttlebutt/2011/butt2011_10.pdf Also see
https://w1uj.net/Moxon/K1KP/readme.html
In 2014 I was asked by WE9V to update the design to account for some
minor errors he found in the wind calculations. Also, he wanted to make
his antenna from 6-foot (2-meter) lengths of tubing. The antenna was
finished in 2015, see https://www.we9v.com/antennas.htm The element
dimensions for this antenna are in WE9V Moxon 100 mi.pdf and Visio-Moxon
Cushcraft XM240 40M.pdf The dimensions from WE9V are here, from an email
from me to him near the end of his project:
"So in summary, an antenna making good use of XM-240, especially the
expensive bigger sections, has 99 mi/h survival and should have the same
electrical performance as the other W6NL-Moxons. The elements, all with
0.058" wall, are as follows for the reflector, which is the more
stressed element:
1-1/2"x72" EH and EA used as reinforcement, add new 1-1/4"x24" inside
1-3/8"x72" 42" exposed, with reinforcement inner 24"
1-1/4"x48" 45" exposed, EB
1-1/8"x48" 44" exposed, EC
1"x16" 13" exposed, half ED
7/8"x18" 14" exposed, new part
3/4"x6" Reinforced, new, to mount cross element
1/2"x48" 39" exposed , EF (could be more or less)
3/8"x36" 13.25" exposed, half EJ, for proper tip length
For the driven element:
1-1/2"x72" EH and EA used as reinforcement, add new 1-1/4"x18" inside
1-3/8"x72" 42" exposed, with reinforcement inner 15"
1-1/4"x48" 45" exposed, EB
1-1/8"x48" 44" exposed, EC
1"x16" 2" exposed, half ED
7/8"x18" 2" exposed, new part
3/4"x6" Reinforced, new, to mount cross element
1/2"x48" 39" exposed , EF (could be more or less)
3/8"x36" 32.5" exposed, EG, for proper tip length
I hope this is what you were looking for. My grandkids always tell me "TMI."
There are also commercial versions of my design, such as W3JK's JK402T
https://jkantennas.com/jk402t.html, see also
https://ac0c.com/main/page_acc_towersantennas_40m_stack.html The JK402T
has several clever mechanical features, such as the mounting bracket for
the cross elements. But it is expensive, so many hams prefer to build
from scratch. DX Engineering has been rumored to be considering offering
a kit based on my design, but nothing concrete at the moment.
73 de Dave, W6NL/HC8L/P40Q
On 5/20/23 1:33 PM, marsh at ka5m.net wrote:
> The attachment didn't work, so here's the link:
>
> http://www.k3lr.com/engineering/moxon/W6NL_Moxon104.pdf
>
> Hope this helps.
>
> Marsh KA5M
>
>
>
>
> -----Original Message-----
> From: TowerTalk <towertalk-bounces at contesting.com> On Behalf Of BRUCE FORD via TowerTalk
> Sent: Saturday, May 20, 2023 2:54 PM
> To: TowerTalk at contesting.com
> Subject: [TowerTalk] Xm240 to moon
>
> I know I am late (always) to this but downsizing and replacing the 160 ft rotating tower with a nice 3el 40 with a 70ft Tristao and a XM240. The band width is not so great and have been reading about this upgrade. I can find no actual pictures of the Moxon element fully constructed so I have to assume looking at tubing lengths each element is about 18ft in total or 9 a side from the boom. Sorry so stupid?just getting old I guess.If anyone has picture of element end constructed and mounted that would be great.
>
> Thanks for any help
>
> Bruce K9RO
> _______________________________________________
>
>
>
> _______________________________________________
> TowerTalk mailing list
> TowerTalk at contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk
>
> _______________________________________________
>
>
>
> _______________________________________________
> TowerTalk mailing list
> TowerTalk at contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk
>
------------------------------
Message: 6
Date: Fri, 19 May 2023 11:58:53 -0400
From: Harry Pliscof <hpliscof at gmail.com>
To: towertalk at contesting.com
Subject: [TowerTalk] Glen Martin Addendum
Message-ID:
<CAJfdkByCjV5N4eFho8VrHks+JcMk4jx7XanMAmi7jDJLhQPuOw at mail.gmail.com>
Content-Type: text/plain; charset="UTF-8"
Contact info:
k8hp at arrl.net
Sorry for the extra bandwidth
------------------------------
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