Such a cable has practical no attenuation on 160 meter. You can simply do all
the tuning in the shack.
Verzonden vanuit Mail voor Windows 10
Van: Ron WV4P
Verzonden: zaterdag 16 mei 2020 23:46
Aan: Richard (Rick) Karlquist
CC: Rob Atkinson; 160
Onderwerp: Re: Topband: 160m Vertical
Thanks
Thanks again for all the replies, it kind of jumped around on my end
between on and off list replies. Hopefully I have not missed any.
The Feedline will be ~300' of 7/8 CellFlex.
Legal Limit on power.
About 8000' of Radials, In theory, 64 @ 120' but rough terrain will
necessitate some flexibility.
On 5/16/2020 4:31 AM, Rob Atkinson wrote:
On 5/15/2020 8:27 AM, donov...@starpower.net wrote:
""A more reliable approach is a tuner in your shack. The extra coax
cable loss from elevated VSWR is insignificant on topband.""
Another disadvantage of a tuner at the shack end is that the match
ba
On 5/15/2020 8:27 AM, donov...@starpower.net wrote:
""A more reliable approach is a tuner in your shack. The extra coax
cable loss from elevated VSWR is insignificant on topband.""
We don't really have enough information to make that claim. First,
you ought to get a copy of Radio-Electronic Tran
Thanks for your kind comments Ron, much appreciated.
Hope to meet you in Dayton in 2021
73
Frank
W3LPL
- Original Message -
From: "Ron WV4P"
To: "Tree"
Cc: "Frank Donovan" , "160"
Sent: Friday, May 15, 2020 4:10:36 PM
Sub
-Original Message-
From: Dave Cuthbert
Aloha Ron.
EZNEC ROHN25 model:
128' resonant at 1.796 MHz, 35 +j0 ohms
115' resonant at 2.000 MHz, 35 +j0 ohms
115', 1.800 MHz, 25 -j46 ohms
115' 1.800 MHz, 4.1 uH base series inductor, 25 +j0 ohms
Dave KH6AQ
--
EZNEC Rohn 25 top loading
115' Rohn 25
4 spoke top hat, 66" x 0.500" tubing
SWR in a 30 ohm system (match 30 ohms to 50 ohms)
1.800 MHz, 2.2:1
1.900 MHz, 1.2:1
2.000 MHz, 2.2:1 KH6AQ (formerly WX7G)
On Fri, May 15, 2020 at 8:13 AM Jim Brown wrote:
> On 5/15/2020 8:27 AM, donov...@starpower.
On 5/15/2020 8:27 AM, donov...@starpower.net wrote:
A more reliable approach is a tuner in your shack. The extra coax
cable loss from elevated VSWR is insignificant on topband.
I strongly agree with this.
Another suggestion. Do your best with what you can rig, using as much
top-loading as pra
> resonance around 1820 kHz
> > >
> > > If for some reason you must install a tuner at the feed point of the
> > > vertical, follow Tree's advice and make it slightly short: 120 feet
> > > of 115 ft if you need to tune for minimum VSWR above 1900 kH
the antenna.
If your TX has troubles to give its power correct to the cable, use a tuner in
the shack.
73, Kees PE5T
Verzonden vanuit Mail voor Windows 10
Van: fmoeves
Verzonden: vrijdag 15 mei 2020 19:20
Aan: topband@contesting.com
Onderwerp: Re: Topband: 160m Vertical
Tree, Thank you very good i
sage ->>
From: "Tree" > To: "Ron WV4P" > Cc: "160"
> Sent: Friday, May 15, 2020 3:18:39 PM> Subject: Re:
Topband: 160m Vertical>> Slightly shorter makes it easy to use an inductor to
make up the> difference. If you make it long - you can do
ll tapped inductor to tune it around the band.
> >
> >
> > 73
> > Frank
> > W3LPL
> >
> >
> >
> >
> >
> > - Original Message -
> >
> > From: "Tree"
> > To: "Ron WV4P"
> > Cc: &quo
"
Sent: Friday, May 15, 2020 3:18:39 PM
Subject: Re: Topband: 160m Vertical
Slightly shorter makes it easy to use an inductor to make up the
difference. If you make it long - you can do the same with a capacitor -
but it's typically more trouble than the inductor.
Tree N6TR
On Fri, May 1
>
> Use a small tapped inductor to tune it around the band.
>
>
> 73
> Frank
> W3LPL
>
>
>
>
>
> - Original Message -----
>
> From: "Tree"
> To: "Ron WV4P"
> Cc: "160"
> Sent: Friday, May 15, 2020 3:18:39 PM
>
t; - Original Message -
>
> From: "Tree"
> To: "Ron WV4P"
> Cc: "160"
> Sent: Friday, May 15, 2020 3:18:39 PM
> Subject: Re: Topband: 160m Vertical
>
> Slightly shorter makes it easy to use an inductor to make up the
> difference. I
W3LPL
- Original Message -
From: "Tree"
To: "Ron WV4P"
Cc: "160"
Sent: Friday, May 15, 2020 3:18:39 PM
Subject: Re: Topband: 160m Vertical
Slightly shorter makes it easy to use an inductor to make up the
difference. If you make it long - you can do th
Myself I like longer,
Yes gotta use a cap, But not too big a deal, I find more variable caps
at hamfests than roller inductors.
PLUS, longer raises the natural impedance too closer to 50 ohms. Of
course NOT 50 but higher than 1/4 wave resistance.
Joe WB9SBD
Sig
The Original Rolling Ball Clo
Slightly shorter makes it easy to use an inductor to make up the
difference. If you make it long - you can do the same with a capacitor -
but it's typically more trouble than the inductor.
Tree N6TR
On Fri, May 15, 2020 at 8:15 AM Ron WV4P wrote:
> I have built an insulated base for a 1/4 wav
I have built an insulated base for a 1/4 wave 160 antenna. The antenna
will be XXX' of Rohn 25. In searching I see people using heights from 115'
- 130' with a pretty high number around 124'.
I do not know how I am going to match it yet, I figure I will do my
research on that once it's up so I can
Rob,
I considered this for my MM SSB. It doesn't work. Several published
tests prove that. Ok as an AC/DC ground.
Grant
On 1/9/2020 01:18, Herbert Schoenbohm wrote:
A very effective device called *Dynaplate* works very well as a saltwater
grounding system for boats or limited areas to run
Rob,
This is a good reference. Only one comment: I found recently on C6AGU that
on 160 m the 2 -3 foot tidal change cause only a small change in the SWR of
a tuned inverted L with its metal base standing in salt-water. I tuned the
antenna to resonance with an SWR of 1.2 at mid-tide. Between low
I operated on a pier over salt water on 160m in 3 locations. Once with
baloon for an inv L. KW with short antenna creates special problems. See my
message yesterday.
Short radials will have extremely high voltage at a KW level. Small metal
plate on salt water may have water sizzling or would intr
Robert,
You only have to "connect" to the salt-water. Don't worry about radials or
field of radials. From you coax shield, or whatever GND (common) you have,
run as many wires as you can into the water. They do not have to be long:
you just want about 6' of wire in the water (even at low tide).
Interesting information here:
http://www.arrl.org/files/file/Antenna%20Book%20Supplemental%20Files/22nd%20Edition/Seawater%20Grounds%20-%20by%20N6LF.pdf
Rob
K5UJ
_
Searchable Archives: http://www.contesting.com/_topband - Topband Reflector
A very effective device called *Dynaplate* works very well as a saltwater
grounding system for boats or limited areas to run full-sized radials. You
can get one for $100 from the link below.
https://www.jamestowndistributors.com/userportal/show_product.do?pid=13331
Herb, KV4FZ
On Wed, Jan 8, 202
I'm thinking Scarborough Reef?73,Gary K9GS
Original message From: Stan Stockton Date:
1/8/20 6:25 PM (GMT-06:00) To: Robert Fanfant Cc:
topband@contesting.com Subject: Re: Topband: 160m vertical saltwater grounding
How big is the land area?Stan, ZF9CW> On Jan 8, 20
How big is the land area?
Stan, ZF9CW
> On Jan 8, 2020, at 4:30 PM, Robert Fanfant wrote:
>
>
> Am looking to activate a location with very limited space surrounded by
> ocean. Think of a small rock surrounded by saltwater/ocean. The vertical
> will be a tall 60’+ fiberglass pole and made t
Just bare copper wire with washers or lead fishing weights tied on the ends is
just fine if you wish to enhance coupling between the vertical and the salt
water, or 4 raised counterpoise wires in the air will also work extremely well.
The main issue is to position the vertical over the near-pe
Am looking to activate a location with very limited space surrounded by ocean.
Think of a small rock surrounded by saltwater/ocean. The vertical will be a
tall 60’+ fiberglass pole and made to resonate on 160m. I would like a way to
reduce the required space of the 160m antenna radial field d
On 11/02/2017 11:25 PM, Wes Stewart wrote:
Well, yes, the transmitter is looking into the transmission line and
then the antenna load, so they are different. To be fair you need to
place the analyzer at the input (TX) end of the line. Now the TX and
the analyzer see the same thing. But this
Well, yes, the transmitter is looking into the transmission line and then the
antenna load, so they are different. To be fair you need to place the analyzer
at the input (TX) end of the line. Now the TX and the analyzer see the same
thing. But this isn't a good way to match the antenna to the
m: Topband [mailto:topband-boun...@contesting.com] On Behalf Of MR TREVOR
DUNNE
Sent: Wednesday, November 01, 2017 12:12 PM
To: Wes Attaway (N5WA)
Cc: topband List
Subject: Re: Topband: 160m Vertical matching Help
Hi Wes
Thanks for the reply I can move the point of lowest SWR by moving the tap on
Sent: Friday, November 03, 2017 1:46 AM
To: Russ Tobolic
Cc: 'Wes Attaway (N5WA)' ; JC ; 'topband List' ; 'Ronald Gorski'
Subject: Re: Topband: 160m Vertical matching Help
I Don't think we even have any AM stations in the country never mind close
enough to bother
Cc: 'topband List'
Sent: Thu, 02 Nov 2017 13:19:21 -0000 (GMT)
Subject: Re: Topband: 160m Vertical matching Help
JC's caution is important. Check to see if you have any MF broadcast stations
near you. I have the MFJ259 and a 5KW AM station at 1480 Kc about 1.5 miles
away
;
; 'Wes Attaway (N5WA)'
Cc: 'topband List'
Sent: Wednesday, November 1, 2017 5:30 PM
Subject: Re: Topband: 160m Vertical matching Help
Hi guys
Before anything else, don't trust MFJ269 reading, transmit with 10 w and
measure the SWR. It is very common the energ
Rick,
what are the ball park figured on the coil diameter I'm guessing 5 or
so inches across is a good place to start
Paul. N0AH
Sent with AquaMail for Android
http://www.aqua-mail.com
On November 1, 2017 11:25:42 AM "Richard (Rick) Karlquist"
wrote:
> You need +j34 ohms in parallel wi
Ideally I don't want to drop the loading wires as they are not easy to get
> to but I can if I need to,
>
> Thanks
> Trevor
>
>
>
> - Original Message -
> From: "Richard (Rick) Karlquist"
> To: "MR TREVOR DUNNE" , "topband List"
pband-boun...@contesting.com] On Behalf Of Ronald
Gorski
Sent: Wednesday, November 01, 2017 2:38 PM
To: MR TREVOR DUNNE ; Wes Attaway (N5WA)
Cc: topband List
Subject: Re: Topband: 160m Vertical matching Help
Trevol, the portion of the coil between the tap and the base of the vertical
determines resonance
Hi Trevor
Read Joe, W4TV's answer again !
The coil should be whatever inductance you need to resonate your slightly
short antenna . . . then you can use that coil as an auto-transformer to get
a good match, ie once the antenna is resonant, you can feed your coax a few
turns up the coil.
But you
...@contesting.com] On Behalf Of MR TREVOR
DUNNE
Sent: Wednesday, November 01, 2017 12:12 PM
To: Wes Attaway (N5WA)
Cc: topband List
Subject: Re: Topband: 160m Vertical matching Help
Hi Wes
Thanks for the reply I can move the point of lowest SWR by moving the tap on
the coil, I need to lower the
rlquist"
To: "MR TREVOR DUNNE" , "topband List"
Sent: Wednesday, 1 November, 2017 17:25:25
Subject: Re: Topband: 160m Vertical matching Help
You need +j34 ohms in parallel with your coax coming in.
This is about 3 microhenries. This would be around 6
turns on your coil if the
Start by disconnecting the feedline. Connect a jumper to the junction
of the vertical wire and the coil. Now use a grid dip meter and tap
down the coil until the antenna is resonant (dip occurs) at the desired
frequency. Now connect the feed line (shield to ground) and tap up the
coil until yo
Trevor,
You haven't really provided enough information to solve your problem. If you
want to use a shunt coil then I suggest that you consider measuring the R-jX at
your frequency of interest and then designing an L-network using purposeful
shortening of the antenna to create a capacitive rea
You need +j34 ohms in parallel with your coax coming in.
This is about 3 microhenries. This would be around 6
turns on your coil if the turns are spaced a wire
diameter. IOW, tap the coax 6 turns from the grounded end.
Then tap the antenna to whatever tunes to 1.83 MHz.
Rick N6RK
On 11/1/2017
;
To: "MR TREVOR DUNNE" , "topband List"
Sent: Wednesday, 1 November, 2017 17:02:55
Subject: RE: Topband: 160m Vertical matching Help
Without doing any modeling, an off the top of the head idea, one option
would be to drop a wire down from the end of each of the T wires you
(318) 393-3289 - Shreveport, LA
Computer/Cellphone Forensics
AttawayForensics.com
---
-Original Message-
From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of MR TREVOR
DUNNE
Sent: Wednesday, November 01, 2017 11:54 AM
To: topband List
Subject: Topband:
Hi All
I finally got the vertical up and running, problem I have now is I can't find a
low SWR on the coil, the best I can get is about 2.8:1 no matter where I tap
the coil that's the best SWR, I can move that point up and down the band by
moving the tap but the SWR stays the same,
My curre
one side at about 45 degrees.
It will make the whole system work. You might have to cut or lengthen the 1/4
wave wire to resonance.
Subject: Topband: 160m Vertical Ideas?
Message-ID:
Content-Type: text/plain; charset=utf-8
Greetings!
Trying to figure out my scheme for 160m. I currently have
lengthen the 1/4
wave wire to resonance.
Subject: Topband: 160m Vertical Ideas?
Message-ID:
Content-Type: text/plain; charset=utf-8
Greetings!
Trying to figure out my scheme for 160m. I currently have three crank up
towers about 35? apart from one another. One cranks up to 106?, the next to 70
On 10/27/2017 9:26 AM, Ed via Topband wrote:
Greetings!
Trying to figure out my scheme for 160m. I currently have three crank up
towers about 35’ apart from one another. One cranks up to 106’, the next to 70’
and third, to 89’.
I figured I could shunt feed one of the taller towers and call i
Greetings!
Trying to figure out my scheme for 160m. I currently have three crank up
towers about 35’ apart from one another. One cranks up to 106’, the next to 70’
and third, to 89’.
I figured I could shunt feed one of the taller towers and call it good but I’m
concerned about interaction am
At KP2M we have a FCP inv-L for 160M. This has improved our signal from the
sloping dipole we originally had up. The land has a steep downward slope
towards the north, about 45 degrees. The vertical is about 30 above an
elevated feed about 10 above the ground. The L portion goes up the hill to
a
Hello all,
Plan on working at getting back on 160 after a few years of being off the air.
I last used an Inv.L and beverage. A meager configuration but served me well.
I've been looking for a decent substitute for the inv.L since the nice tall
tree I used has been cut down. Has anyone tried
Not sure what you mean by fictional parts...
I thought that I explained the "problem" with some historical development in my
article.
The main difference in understanding the efficiency of "loaded" antenna is that
we are not dealing with DC currents and voltages (W8JI argument) but RF
currents
>
> Linear loading is less efficient than coil, base loading worst, top loading
> is the best,...
>
This is absolutely true, and thoroughly proven and documented. Unless one's
circumstances are very unusual, nothing except top loading should even be
considered.
73 Mike
www.w0btu.com
_
Beside all that is correct higher efficient mobile antennes on the low bands
are those with base loading by high Q coils.
73
Peter
-Original Message-
From: topband-boun...@contesting.com [mailto:topband-boun...@contesting.com]
On Behalf Of k...@optimum.net
Linear loading is less efficien
you thought about the possibility to use linear loading?
>> That could be
>>> a good alternative when you cant put the loading on top...
>>>
>>> 73 de Lars, SM3BDZ
>>>
>>>
>>> - Original Message -
>>> From: "Stein Roar B
On Sat, 23 Apr 2011 16:05:24 + (GMT)
k...@optimum.net wrote:
> On the subject of resonant loaded radiator - element
>please see my article at
> http://www.k3bu.us/loadingcoils.htm
> it took me some 40 years to realize wasaaap with loaded
>elements - current distribution and efficiency.
Yur
od alternative when you cant put the loading on top...
> >
> > 73 de Lars, SM3BDZ
> >
> >
> > ----- Original Message -
> > From: "Stein Roar Brobakken"
> > To:
> > Sent: Wednesday, April 20, 2011 7:11 PM
> > Subject: Topband: 16
I usea top loaded 90 ft vertical with 4 off 36ft top load wires at 45
degrees which also be come the 4 guy wires to support the top.. Other guy
are at 40 es 60 ft levels.. I have 60 x 1/4 wave gnd radials, es use a multi
tap toroid transformer set at approx 18 ohm point..
In 10 months have wked 103
gt;
>
> - Original Message -
> From: "Stein Roar Brobakken"
> To:
> Sent: Wednesday, April 20, 2011 7:11 PM
> Subject: Topband: 160m vertical with "top loading"
>
>
>> Hi
>>
>> We are going to install a 18m spiderbeam @ LA9TJ
Ho
i guess you are talking about a spider pole not a beam?
Look what is done in your country with poles:
http://www.comrod.com/getfile.php/Utvikling/AT101D_S%2023042009.pdf
If the hat wires are to long, you end up with a kind of windom with
"glassfever feedsystem.
Best you modell itbefore e
Hi Rag!
Have you thought about the possibility to use linear loading? That could be
a good alternative when you cant put the loading on top...
73 de Lars, SM3BDZ
- Original Message -
From: "Stein Roar Brobakken"
To:
Sent: Wednesday, April 20, 2011 7:11 PM
Subject: Top
Hi
We are going to install a 18m spiderbeam @ LA9TJA for use for 160m
We been studying different top loading configurations, but we can't have the
wires stringed from the top because it will break the spiderbeam ;)
So our plan was to take this 18m and have it high in a tree.. maybe have
totally
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