uld let you quickly connect/disconnect the strap as you raise/lower
> the mast.
>
> Hope this helps.
>
> 73, Dick WC1M
>
> -Original Message-
> From: N4ZR
> Sent: Monday, October 1, 2018 11:48 AM
> To: topband reflector
> Subject: Topband: Shunt feeding AB-57
reflector
Subject: Topband: Shunt feeding AB-577/621
I have an AB-577 with a C-3E on top, and am interested in the possibility of
shunt-feeding it for 160 - 100 watts only. Anyone have any experience with
doing this? Are the section-to-section joints adequately conductive? I would
plan to use
Hi Pete,
I'd suggest you proceed with an inverted-L
73
Frank
W3LPL
- Original Message -
From: "N4ZR"
To: "topband reflector"
Sent: Monday, October 1, 2018 3:47:37 PM
Subject: Topband: Shunt feeding AB-577/621
I have an AB-577 with a C-3E on to
On 2018-10-01 11:47 AM, N4ZR wrote:
> I have an AB-577 with a C-3E on top, and am interested in the
> possibility of shunt-feeding it for 160 - 100 watts only. Anyone have
> any experience with doing this? Are the section-to-section joints
> adequately conductive?
The section joints should
I have an AB-577 with a C-3E on top, and am interested in the
possibility of shunt-feeding it for 160 - 100 watts only. Anyone have
any experience with doing this? Are the section-to-section joints
adequately conductive? I would plan to use an omega match, because I'm
guessing it would be
If anyone needs some info, drop me an email and I will send you some info. It
has worked on towers from 55 to 80 ft with or with out a stack of antennas.
73 de Price w0riw0ri...@sbcglobal.net
_
Topband Reflector Archives - http://www.contesting.com/_topband
Reading about 3-wire cages and the like, I feel a serious case of shunt
envy. Mine is a single wire about 18 inches from one corner of my Rohn
25, connected to the tower at about 50 feet. I used an omega match with
a couple of 3 KV transmitting variables, because my tower is quite tall
for
How is inteference on rotor or relay boxes?I thinking 1kw generate magnetic
radiation into cables ??? How u solve this guys ?? Tnx
---Sent by iphoneLB3RE LJ3RE K3RAG ex: LA6FJAwww.lb3re.com ~ Rag ~ Stein Roar
Brobakken e-mail:post@lb3re.comhttp://la5o.wordpress.comwww.contesting.no
I place all rotor wires and other cable through a few 3 Ferrite rings
at the base of the tower with as many turns as I can squeeze on. Before
doing this I had a slight deflection in the rotor indicator at the shack
when I was on 160. Now I have none. The most sensitive item may be the
heavy
-
From: Pete Smith N4ZR n...@contesting.com
To: topband@contesting.com
Sent: Wednesday, August 27, 2014 6:28 AM
Subject: Re: Topband: Shunt feeding tower
Reading about 3-wire cages and the like, I feel a serious case of shunt
envy. Mine is a single wire about 18 inches from one corner of my Rohn
.
Carl
KM1H
- Original Message -
From: LB3RE LJ3RE Stein-Roar Brobakken p...@lb3re.com
To: Pete Smith N4ZR n...@contesting.com
Cc: topband@contesting.com
Sent: Wednesday, August 27, 2014 8:35 AM
Subject: Re: Topband: Shunt feeding tower
How is inteference on rotor or relay boxes?I
, August 27, 2014 6:28 AM
Subject: Re: Topband: Shunt feeding tower
Reading about 3-wire cages and the like, I feel a serious case of shunt
envy. Mine is a single wire about 18 inches from one corner of my Rohn
25, connected to the tower at about 50 feet. I used an omega match with a
couple
I would like to get on 160 this question most likely has been asked a 1000 time
but I need information as how or can I shunt feed my 55 ft rohn 45 .
Don
_
Topband Reflector Archives - http://www.contesting.com/_topband
The first info needed is are the guy wires insulated from the tower and what
is on top including mast?
Carl
KM1H
- Original Message -
From: Don w4...@truvista.net
To: topband@contesting.com
Sent: Tuesday, August 26, 2014 5:12 PM
Subject: Topband: Shunt feeding tower
I would like
Don, Build a three or 4 wire cage around the tower from top to ground
out 24 inches #10 or 12 bar copper is fine. A few standoff PVC or
fiberglass will lessen changes in high wind conditions. Measure the cage
to ground and build the required matching unit with the appropriate
series
I'm sure it will play well in terms of keeping your transmitter happy but
the relatively large bandwidth you are measuring is indicative of
substantial loss in the system somewhere.
This would be a large bandwidth even if you did not have the bandwidth
narrowing effects of a shunt feed.
Hi
Message-
From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of JC N4IS
Sent: Sunday, February 23, 2014 7:20 AM
To: 'Richard (Rick) Karlquist'; 'Carl Braun'; 'Carl'; '160'
Cc: w...@att.net; ad...@arrl.net
Subject: Re: Topband: Shunt feeding the Skyneedle - new developments
I'm sure
definitely ready to get the RX loop up as listening on the needle is rough.
Thanks Tom
Carl AG6X
-Original Message-
From: Tom W8JI [mailto:w...@w8ji.com]
Sent: Saturday, February 22, 2014 12:17 AM
To: Carl Braun
Cc: 160
Subject: Re: Topband: Shunt feeding the Skyneedle - new developments
...we'll see.
Thanks again
Carl AG6X
-Original Message-
From: Charlie Cunningham [mailto:charlie-cunning...@nc.rr.com]
Sent: Friday, February 21, 2014 8:18 PM
To: Carl Braun; 'ZR'; '160'
Subject: RE: Topband: Shunt feeding the Skyneedle - new developments
Hi, Carl
Well, I think that what you
...@lairdtech.com]
Sent: Saturday, February 22, 2014 7:23 AM
To: Charlie Cunningham; 'ZR'; '160'
Subject: RE: Topband: Shunt feeding the Skyneedle - new developments
Charlie
Thanks for the tip. I may play with a bit of inductance just to see how the
system reacts.
Not sure if I can post a pic here but I'm
Thanks for the tip. I may play with a bit of inductance just to see how the
system reacts.
This is way more problematic than it needs to be.
First, no one even knows if the reactance is real or a false reading caused
by a bit error from calibration or noise.
Second, no one knows the sign
;
'160' topband@contesting.com
Sent: Friday, February 21, 2014 10:35 PM
Subject: Re: Topband: Shunt feeding the Skyneedle - new developments
Well, if I recall correctly, Carl, Carl said his feedline was about 70' of
LMR-400, so even at 2 2:1 or 2.5:1 VSWR, the excess losses in 70' of LMR-400
, K4OTV
-Original Message-
From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of Tom W8JI
Sent: Saturday, February 22, 2014 9:09 AM
To: Carl Braun; '160'
Subject: Re: Topband: Shunt feeding the Skyneedle - new developments
Thanks for the tip. I may play with a bit
I don't expect that ANY of those are valid concerns at 1.3:1 VSWR!!
-Original Message-
From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of Carl
Sent: Saturday, February 22, 2014 9:14 AM
To: Charlie Cunningham; 'Carl Braun'; '160'
Subject: Re: Topband: Shunt feeding
@contesting.com
Sent: Saturday, February 22, 2014 9:23 AM
Subject: RE: Topband: Shunt feeding the Skyneedle - new developments
I don't expect that ANY of those are valid concerns at 1.3:1 VSWR!!
-Original Message-
From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of Carl
Sent
Sent: Saturday, February 22, 2014 9:46 AM
To: Charlie Cunningham; 'Carl Braun'; '160'
Subject: Re: Topband: Shunt feeding the Skyneedle - new developments
That 1.3 is only at ONE frequency Charlie, he is not crystal controlled.
What is the 2:1 bandwidth at the amp?
Carl
KM1H
- Original
VSWR's.
Carl
KM1H
- Original Message -
From: Charlie Cunningham charlie-cunning...@nc.rr.com
To: 'Carl' k...@jeremy.mv.com; 'Carl Braun'
carl.br...@lairdtech.com; '160' topband@contesting.com
Sent: Saturday, February 22, 2014 9:57 AM
Subject: RE: Topband: Shunt feeding the Skyneedle
...@contesting.com] On Behalf Of Carl
Sent: Saturday, February 22, 2014 10:41 AM
To: Charlie Cunningham; 'Carl Braun'; '160'
Subject: Re: Topband: Shunt feeding the Skyneedle - new developments
Charlie youre continually missing the point; ignore cable loss period.
The only issue is what impedance does the amp see
It may not be obvious but often you can get better bandwidth by NOT tuning
for 1:1 at the desired frequency! Those familiar with the Smith chart probably
already know this.
A narrow band antenna will produce a curve between a U and a V on the
Smith chart. If you tune for a 1:1 SWR, you bring the
-
From: Charlie Cunningham charlie-cunning...@nc.rr.com
To: 'Carl' k...@jeremy.mv.com; 'Carl Braun'
carl.br...@lairdtech.com; '160' topband@contesting.com
Sent: Saturday, February 22, 2014 11:03 AM
Subject: RE: Topband: Shunt feeding the Skyneedle - new developments
Well, I agree with all that, Carl
-Original Message-
From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of Roger D
Johnson
Sent: Saturday, February 22, 2014 11:16 AM
To: '160'
Subject: Re: Topband: Shunt feeding the Skyneedle - new developments
It may not be obvious but often you can get better bandwidth by NOT tuning
, 2014 11:03 AM
Subject: RE: Topband: Shunt feeding the Skyneedle - new developments
Well, I agree with all that, Carl. But Carl Braun, was reading dead-flat
1:1 at the transmitter end of his cable. I believe he is done!! The antenna
Q is what it is! As for improving his 2:1 VSWR bandwidth
it
plays
73
Carl AG6X
-Original Message-
From: Carl [mailto:k...@jeremy.mv.com]
Sent: Saturday, February 22, 2014 1:22 PM
To: Carl Braun
Subject: Re: Topband: Shunt feeding the Skyneedle - new developments
Subject: Re: Topband: Shunt feeding the Skyneedle - new developments
! Enjoy!
73,
Charlie, K4OTV
-Original Message-
From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of Carl
Braun
Sent: Saturday, February 22, 2014 7:16 PM
To: Carl; '160'
Cc: w...@att.net; ad...@arrl.net
Subject: Re: Topband: Shunt feeding the Skyneedle - new developments
Carl
On 2/22/2014 4:15 PM, Carl Braun wrote:
Inside the shack on the 1000D and the BIRD I see 1.1:1 Vswr at 1.800 MHz, FLAT
1.0:1 from 1.810 to 1.860 and 1.5:1 at 1.895 MHz.
I'm eager to get back on the air tonight and tomorrow morning to see how it
plays
I'm sure it will play well in terms
I was pretty satisfied with this scenario so I mounted my variable cap on a
3/4 thick piece of Plexiglas to the backplane via Teflon bolts inside the
steel enclosure. When I did this I saw my analyzer jump to 45 -j11 ohms.
No matter how much tweaking was done the lowest X on the analyzer was
.
That does not imply increased or excessive loss!
Regards
Charlie
-Original Message-
From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of Tom W8JI
Sent: Saturday, February 22, 2014 9:07 PM
To: Carl Braun; '160'
Subject: Re: Topband: Shunt feeding the Skyneedle - new
22, 2014 7:15 PM
Subject: RE: Topband: Shunt feeding the Skyneedle - new developments
Carl and Topbanders
Here are the latest details and I will try and be as thorough as possible.
Good news! I built my gamma cage and the antenna now performs MUCH better.
Here's where I stand:
90' Tri Ex
-Original Message-
From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of Carl
Sent: Saturday, February 22, 2014 10:08 PM
To: Carl Braun; '160'
Cc: w...@att.net; ad...@arrl.net
Subject: Re: Topband: Shunt feeding the Skyneedle - new developments
That is the type of report I really
All
Topband list
If you've followed my efforts to shunt feed my Skyneedle tower you'll know that
I settled with a tap point of 67' and 30 or so of spacing with my feed point
reading 42 + j0 ohms. This reading was taken at the interior of my 20 x 30 x
8 steel Hoffman enclosure with the
Since then I've moved the variable capacitor inside the panel and mounted it
to a ¾ think Plexiglas sheet mounted to the back plane with nylon bolts and
washers. There is a 1 air gap between the Plexiglas and the backplane. I
now have seen the 42+j0 ohms change to 45 - j11 ohms...that's the
, February 21, 2014 8:02 PM
To: Carl Braun; '160'
Subject: Re: Topband: Shunt feeding the Skyneedle - new developments
Since then I've moved the variable capacitor inside the panel and mounted it
to a ¾ think Plexiglas sheet mounted to the back plane with nylon bolts and
washers. There is a 1 air
To: Carl Braun; '160'
Subject: Re: Topband: Shunt feeding the Skyneedle - new developments
Since then I've moved the variable capacitor inside the panel and mounted it
to a ¾ think Plexiglas sheet mounted to the back plane with nylon bolts and
washers. There is a 1 air gap between the Plexiglas
-cunning...@nc.rr.com]
Sent: Friday, February 21, 2014 5:21 PM
To: 'Tom W8JI'; Carl Braun; '160'
Subject: RE: Topband: Shunt feeding the Skyneedle - new developments
Well, Carl
I plotted your 45-j11 load on a Smith Chart (normalized to 50 ohms) and it's
very near the origin on a 1.3:1 VSWR circle. Since
...@contesting.com] On Behalf Of Charlie
Cunningham
Sent: Friday, February 21, 2014 8:30 PM
To: 'Tom W8JI'; 'Carl Braun'; '160'
Subject: Re: Topband: Shunt feeding the Skyneedle - new developments BTW
BTW. Carl
I agree completely with Tom that there's no point in having a static-bleed
choke
I'd think your Henry would match that just fine WITHOUT the Nye Viking
tuner!!
73,
Charlie. K4OTV
-Original Message-
From: Carl Braun [mailto:carl.br...@lairdtech.com]
Sent: Friday, February 21, 2014 8:46 PM
To: Charlie Cunningham; 'Tom W8JI'; '160'
Subject: RE: Topband: Shunt feeding
The only benefit of getting it better would be a bit more 2:1 VSWR bandwidth
to keep the amp happy but even then there is sometimes a gotcha when tuning
an antenna.
Carl
KM1H
Subject: Re: Topband: Shunt feeding the Skyneedle - new developments
Well, you can do all that, Carl
But if your
Sent: Friday, February 21, 2014 10:11 PM
To: Charlie Cunningham; 'Carl Braun'; '160'
Subject: Re: Topband: Shunt feeding the Skyneedle - new developments
The only benefit of getting it better would be a bit more 2:1 VSWR bandwidth
to keep the amp happy but even then there is sometimes a gotcha when
Message-
From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of Carl
Braun
Sent: Friday, February 21, 2014 8:46 PM
To: Charlie Cunningham; 'Tom W8JI'; '160'
Subject: Re: Topband: Shunt feeding the Skyneedle - new developments
Thanks to all who replied
Tom W8JI, your comments
:31 PM
To: ZR
Cc: Charlie Cunningham; 160
Subject: Re: Topband: Shunt feeding the Skyneedle - new developments
Thanks guys
The j11 ohms is the best I can get period. I was able to get j0 when the cap
was outside of the steel enclosure with a better bandwidth. Maybe I should
throw my $400 enclosure
-Original Message-
From: Carl Braun [mailto:carl.br...@lairdtech.com]
Sent: Friday, February 21, 2014 10:39 PM
To: Charlie Cunningham; 'Tom W8JI'; '160'
Subject: RE: Topband: Shunt feeding the Skyneedle - new developments
Charlie
The cap is no where near maxed out. I'm using approx 150pf of a 1050pf
...@contesting.com] On Behalf Of ZR
Sent: Friday, February 21, 2014 10:11 PM
To: Charlie Cunningham; 'Carl Braun'; '160'
Subject: Re: Topband: Shunt feeding the Skyneedle - new developments
The only benefit of getting it better would be a bit more 2:1 VSWR bandwidth
to keep the amp happy but even
: Topband [mailto:topband-boun...@contesting.com] On Behalf Of Carl
Braun
Sent: Friday, February 21, 2014 10:56 PM
To: Charlie Cunningham; 'ZR'; '160'
Subject: Re: Topband: Shunt feeding the Skyneedle - new developments
I'm working on the radial field weekly.
Here is a theoretical question that results
, February 04, 2014 10:27 PM
Subject: Re: Topband: Shunt feeding the Skyneedle
Thanks for the input Tom
The only variable cap I have is the EF Johnson which is 60-160pf. I have
some ham radio stuff at my parents house not the least is a Jennings
1000pf vac variable rated at 5KV or 7.5kv. I was hoping
Topbanders
If you followed my post on 'In search of resonance' you'll see that I was
struggling with feeding a 160m inverted L up close to my 90' Skyneedle. Tom
W8JI suggested that I cut back the L to 129' but the same phenomenon was
seen...that being the VERTICAL section of the inverted L
Tom and group
The SWR is 2.4:1 at 1822
I have an old Heathkit tuner that has a pair of air variables that I may
temporarily yank to experiment with gamma vs. omega matching. I've got a wing
wang capacitance meter that would tell me the values once I get something to
resonate.
The 160pf
: Monday, February 03, 2014 11:17 AM
Subject: Topband: Shunt feeding the Skyneedle
Topbanders
If you followed my post on 'In search of resonance' you'll see that I was
struggling with feeding a 160m inverted L up close to my 90' Skyneedle. Tom
W8JI suggested that I cut back the L to 129
-Original Message-
From: ZR [mailto:z...@jeremy.mv.com]
Sent: Tuesday, February 04, 2014 8:13 AM
To: Carl Braun; '160'
Cc: 'Tom W8JI'
Subject: Re: Topband: Shunt feeding the Skyneedle
Any idea how much top loading that 5 el 46' boom monster contributes?
At a prior QTH in the 80's I had a 90' 25G
...@lairdtech.com
To: '160' topband@contesting.com
Cc: 'Tom W8JI' w...@w8ji.com
Sent: Monday, February 03, 2014 11:17 AM
Subject: Topband: Shunt feeding the Skyneedle
Topbanders
If you followed my post on 'In search of resonance' you'll see that I was
struggling with feeding a 160m inverted L up close to my
Thanks for the input Tom
The only variable cap I have is the EF Johnson which is 60-160pf. I have some
ham radio stuff at my parents house not the least is a Jennings 1000pf vac
variable rated at 5KV or 7.5kv. I was hoping to use that with a 12v motor for
QSYing up the band for contesting.
the vertical section was still suppressed and the top 29' was resonating.
With this in mind I decided to run a shunt wire from the top to see where
the antenna resonates. Here's what I found..
I was afraid the tower was messing up the L. This is what happens when they
are are nearly
So, i'm assuming you're suggesting that I drop the gamma arm down to the 67'
level and see what the impedance looks like? If so, I'm guessing the series
C required to tune would increase in value?
There will be some tap point where the shunt capacitor is not required.
Eliminating the shunt
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