Perhaps common-mode isolation of currents induced in the antenna coax shield??
Charlie, K4OTV
Lee K7TJR k7...@msn.com wrote:
Hmmm, I wonder why the Array Solutions circuit board picture shows MCL 1:1
transformers.
Sounds fishy to me. Even the waveform pictures show clipping at a
Some years ago, a few of us would occasionally have QSOs that we called
Martin Luthers -as in I had a DREAM last night! and we'd send off the QSLs
and would often get one back! This was especially true on 160. I still,
occasionally , have a Martin Luther! Straining right down into the noise
Message-
From: KL7RA [mailto:kl...@ptialaska.net]
Sent: Saturday, February 28, 2015 10:53 PM
To: Charlie Cunningham; 'Glenn Biggerstaff'; topband@contesting.com
Subject: Re: Topband: 160 Tower on 80
Any thoughts or alternative ideas would be greatly appreciated.
Glenn WW4B
Hi Glenn, all
Well, Glenn, I would lean toward voltage-feed at the base, since you have
that insulated tower! Because of the lower current, the ground-losses
would be minimized, and the current maximum would be fairly high on the
tower, resulting in a nice low-elevation angle, omni-directional radiator
for
Í would leave it alone, Mike! Your tuner or amplifier should be able to
tune out that small bit of reactance, I would think! And on 160 the excess
loss in the coax from a bit of VSWR is really negligible!
GL!
73,
Charlie, K4OTV
-Original Message-
From: Topband
The joys of Internet DXing!! Everybody that comes on is swamped by
packet-rats!!
73,
Charlie, K4OTV
-Original Message-
From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of Kenneth Grimm
Sent: Thursday, February 19, 2015 10:37 AM
To: GALE STEWARD
Cc: topband@contesting.com
True, George1
Those were excellent times for 160, 80 and 40m and worked well for me!
There's a lot to be said for keeping an eye on the daylight map and being
where the competition isn''t! My 160 antenna has been down for a few years,
but I had a very easy 160 QSO with K1N using the remnant of
Jon,
If you haven't already, check this app out! It was just great figuring out
time slots to try the various bands for the K1N expedition! It's a VERY
useful tool for DXers - especially low-band DXers! Sure beats the old
plastic DX Edge that we used in the old days. Very useful for looking
Well, do keep in mind, Rune, that it's summertime in Ecuador, and he has
summertime QRN, whereas it's wintertime in LA , so the band is quieter where
you are! J
73,
Charlie,K4OTV
-Original Message-
From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of Rune Øye
Actually ,Jim, the velocity of propagation of radio waves (or light waves)
in free space is about 1 foot/nanosecond, NOT 1 foot per microsecond. It
would seem to me that one needs to have a measure of directivity as well a s
time, an the time factor might boil down to phase difference
Amen!
73,
Charlie, K4OTV
-Original Message-
From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of Doug
Renwick
Sent: Sunday, February 08, 2015 2:34 PM
To: topband@contesting.com
Subject: Re: Topband: K1N DQRM Tracking Project
A poster on the cluster said it the best:
DQRM
I surely don't think so! I don't expect that there is any way, unless ALL
amateur transmitters were equipped with an embedded address encoder and
supplied the owner/operator's call and the station GPS coordinates!!
My $0.02
73,
Charlie, K4OTV
-Original Message-
From: Topband
or not.
The question was if K1N had lost their QSO from the computer log. No matter
how sure you are you made the contact, if it's not in their computer log, for
whatever reason, it can't be confirmed.
Kevin K3OX
- Original Message -
From: Charlie Cunningham charlie-cunning...@nc.rr.com
To: Eddy
I agree, Gary. Over the years I've seem a number of DX stations do that -
especially on quiet bands or if they have more modest stations, or are in
really far-away places. It's never bothered me and I've always just viewed
as an invitation and an announcement that they are QRV. Of course,
I haven't bothered with it, Doug. I see it mostly as an exercise in
futility. The cops never ID, and the MOST TROUBLESOME QRM is from
packet-rats seeing the spots and then tuning up interminably on to he DX
QRG - of course they never ID either - and they are too lazy and
inconsiderate to move off
Well, Tree, I think you might make a good case for a duplicate contact! My
160 QSO disappeared for a while, but eventually re-appeared! GL!\
73,
Charlie, K4OTV
-Original Message-
From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of Tree
Sent: Friday, February 06, 2015 12:58
Yeah- I saw that Tree's 160 QSO is back in log now. Maybe yours is there?
73,
Charlie, K4OTV
-Original Message-
From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of Dave
Clouser
Sent: Friday, February 06, 2015 1:16 PM
To: topband@contesting.com
Subject: Re: Topband:
Well, we did survive just fine, Eddy and lots of folks mad the Honor Roll,
5BDXCC etc..
All this nonsense about the online logs is just so much Bull!!! Can all be
avoided if folks would do the following:\
1.0 COPY your own call!!! No guesswork, no fragments, no bluffing etc.
2.0 Copy
Hi, Herb
Did you work K1N on 1817.5 this evening?
73,
Charlie, K4OTV
-Original Message-
From: Charlie Cunningham [mailto:charlie-cunning...@nc.rr.com]
Sent: Friday, February 06, 2015 7:59 PM
To: 'Herbert Schoenbohm'; 'topband@contesting.com'
Subject: RE: Topband: K1N what time
They may still be using that dipole hanging from the lighthouse, Art! I
don't know that for sure, but thepy had BIG 160 signals when I worked the
early in the week on 160. I understand that t he;y have been installing
Beverages for receiving. That dipole was more or less vertical from what I
Right now, Herb. 1817.3 up a couple.
73,
Charlie, K4OTV
-Original Message-
From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of Herbert
Schoenbohm
Sent: Friday, February 06, 2015 5:41 PM
To: topband@contesting.com
Subject: Re: Topband: K1N what time are they QRV on top?
I certainly agree with your final point, Mike! Amen!
73,
Charlie, K4OTV
-Original Message-
From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of Michael
Walker
Sent: Friday, February 06, 2015 10:35 AM
To: topband@contesting.com
Subject: Re: Topband: K1N On Line Log
Hi, Jim
Well, it was a bit of a wait, but all 6 of my QSOs are back online now,
including 160. I also got 'em on 80 and 160 - but - wonder of wonders - I
wkd 'em on 160 fairly quickly on 160 with my 80m GP that, at the moment has
only one radial! I've been off the air for a while struggling with
You may be right, Tree. My 160 QSO is in there, but I worked them night
before last with my 80m GP with ONE radial! What a surprise! Just thought
I'd hoot at 'em because they had such a good signal here in NC.
It took my 12m and 15 m QSOs another day to show up!
73,
Charlie, K4OTV
T hanks for the correction, Stan. My old eyes missed that!! A 90' tower won't
require much top-loading at all!
Sorry for my error
73,
Charlie, K4OTV
-Original Message-
From: Stan Stockton [mailto:wa5...@gmail.com]
Sent: Wednesday, February 04, 2015 1:41 PM
To: Charlie Cunningham
seen my share of fried line bypass capacitors in consumer
electronics and radio gear.
73,
Charlie, K4OTV
-Original Message-
From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of HAROLD
SMITH JR
Sent: Wednesday, February 04, 2015 9:16 PM
To: Charlie Cunningham; 'Paul
Hi, Paul
For AC line bypass capacitors look for UL-rated Ceramic Disc capacitors that
typically have AC working voltages like 250 VAC or higher. These are
designed and rated for AC line service and can take the surges that occur on
AC lines.
Check Digi-Key, Newark and others - you'll find
Multi-path was my thought as well!
Merry Christmas!
73,
Charlie, K4OTV
-Original Message-
From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of Tom W8JI
Sent: Thursday, December 25, 2014 11:02 AM
To: Richard (Rick) Karlquist; Art Roberts - W5AER; topband@contesting.com
From your description and your measured data, Larry, I don't see how you
could improve the antenna noticeably! Why do you feel a need to improve it?
I appears to be resonant, well-matched and it appears to have an excellent
ground image system! I think you might be kidding yourself if you
6:14 PM
To: Charlie Cunningham
Cc: topband@contesting.com
Subject: Re: Topband: 160 Shunt-Fed Tower Readings
line
Why do you feel a need to improve it?
Thanks for the response, Charlie!
I'm concerned about a few things:
1) I'm thinking the antenna is electrically too short. After all, the Yagi
N0!! That's the equivalent series capacitance that correspond to -j5.6ohms
capacitive reactance! It would be much clearer if the analyzer would present
it in that form, since it clearly has determined the sign - since it's
indicating an equivalent capacitance.
Anyway, I stand by what I wrote
a LOT! Have fun and have a Merry Christmas!
73,
Charlie, K4OTV
-Original Message-
From: Larry K4AB [mailto:larry.k...@gmail.com]
Sent: Wednesday, December 10, 2014 8:23 PM
To: Charlie Cunningham
Cc: topband@contesting.com
Subject: Re: Topband: 160 Shunt-Fed Tower Readings
TU, Charlie
Thanks, Carl
I suppose all those wires helped to increase bandwidth.
Charlie
K4OTV
-Original Message-
From: Carl [mailto:k...@jeremy.qozzy.com]
Sent: Saturday, December 06, 2014 10:20 AM
To: Charlie Cunningham; 'Paul Christensen'; 'topband'
Subject: Re: Topband: EZNEC 5.0 +
Charlie
Hi, Chuck
Well return loss is a transmission line term that is a measure of the
reflection on the line. So a transmission line that is terminated in its
characteristic impedance would have 0 reflection, or infinite return loss or
1.0:1 VSWR. Conversely if the line was lossless and terminated in
Well, I would respectfully disagree with Tom, that Return Loss is
confusing or ,misleading. It's just another way of looking at reflections
that often makes more sense of is more useful. For example, many filters
etc. are specified in terms of their input return loss, usually in a 50 ohm
Not sure that I can picture just what you are describing, Paul. Even though, I
wasn't born until 1944, I've explored just about every type of antenna and I've
modeled an awful lot of them.
Of course the typical inverted L is just a monopole that is bent over at the
top to reduce the required
I had good results with a matching transformer for 50-800 ohms for a
terminated KAZ receiving loop, that was wound on a binocular core of 73
material. Very modest turn count. I wound it as a conventional transformer
with wire-wrap wire to accommodate the small core. The loop worked VERY well
on
Hi, Joe
I didn't have time to write you earlier. It was obvious that you had a lot
of ground loss in series with the radiation resistance of the inverted-L
that was swamping the reactance variation of the inverted L. You are
likely to be very pleasantly surprised at how effective two elevated
That loop might do better for DX if you fed it 1/2 way up one end.
73,
Charlie, K4OTV
-Original Message-
From: Charlie Cunningham [mailto:charlie-cunning...@nc.rr.com]
Sent: Tuesday, November 11, 2014 12:54 AM
To: 'W3AW'
Subject: RE: Topband: Balun or no balun
Why the 30' of ladder
Well, that is exactly what it's all about, Dan!!
Some of us need to press those points really hard with FCC and ARRL! They
are trying to usurp our amateur spectrum for commercial and monetary
purposes
And it really IS about the maritime services!! They are wanting to provide
Internet services
of
splitter loss.
73,
Charlie, K4OTV
-Original Message-
From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of Carl
Sent: Friday, March 14, 2014 10:41 AM
To: Charlie Cunningham; garyk...@wi.rr.com; 'Topband Mailing List'
Subject: Re: Topband: Passive Receive Antenna Splitter
That should work fine, Gary! You would have around 3 dB loss in a two-way
splitter + a SMALL amount of mismatch-loss for the 50-75 ohm mismatch. I
would expect that if your radio will work with the beverage signal, you
won't likely need the preamp to make up for tha very modest loss from the
One word of caution, Gary, if the CATV splitter is a transformer type,
rather than resistive it may of have enough low-frequency response for 160
m! Check around with RS and your local electronics stores for 50 ohm 2-way
splitters. Those are generally resistive and have frequency response from DC
in the amateur bands!! WE
DON'T NEED OR WANT THIS!! PLEASE CONTACT YOUR ARRL REPRESENTATIVES AND ASK
THEM TO OPPOSE THIS BLATANT GRAB FOR OUR SPECTRUM FOR NON-AMATEUR PURPOSES!
Best regards,
Charlie Cunningham, K4OTV
-Original Message-
From: Topband [mailto:topband-boun...@contesting.com
Brown
Sent: Wednesday, March 05, 2014 12:25 AM
To: topband@contesting.com
Subject: Re: Topband: New MFJ 259C available
On 3/4/2014 7:04 PM, Charlie Cunningham wrote:
I'd also like to be able to apply VNA measurements to some of my HF
antennas
and I might be willing to take a laptop out there to do
True!! Check out the prices of the Cal kits for the Agilent VNAs!
73,
Charlie, K4OTV
-Original Message-
From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of Jim Brown
Sent: Tuesday, March 04, 2014 1:36 PM
To: topband@contesting.com
Subject: Re: Topband: New MFJ 259C
Those should surely be accurate enough, but what kind of connectors?
Charlie, K4OT V
-Original Message-
From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of Carl
Sent: Tuesday, March 04, 2014 2:41 PM
To: j...@audiosystemsgroup.com; topband@contesting.com
Subject: Re:
-
From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of Carl
Sent: Tuesday, March 04, 2014 3:01 PM
To: Charlie Cunningham; j...@audiosystemsgroup.com; topband@contesting.com
Subject: Re: Topband: New MFJ 259C available
SMA for the 24GHz, open, thru and short. I also have high end adaptors
What the hell is the need for wideband data in the amateur radio bands? Is
it just a ploy to usurp the amateur bands for commercial purposes? And
there's a heck of a lot more band width available at VHF and UHF! Why
wideband at HF?? Makes no sense to me!
??
Charlie, K4OTV
-Original
73,
Charlie, K4OTV
From: HAROLD SMITH JR [mailto:w0ri...@sbcglobal.net]
Sent: Tuesday, March 04, 2014 6:32 PM
To: Charlie Cunningham; 'Carl'; j...@audiosystemsgroup.com;
topband@contesting.com
Subject: Re: Topband: New MFJ 259C available
This sure doesn't sound like topband to me
Well, I might be willing to use a VNA that attaches to a computer in my Lab,
if I could get away with much lower cost than one of the Agilent or Rhode
and Schwarz VNAs. I'd like to have the capability to cover the 2.5 GHz
band and go considerably higher so I could look at harmonic filters for
No, I don't believe 240' is too high - especially if the tower has a base
insulator! It would be so close to 1/2 wave on 160, that it could be fed
very well as a 1/2 wave radiator on 160, either via a parallel tuned tank or
a 1/4 wave of perhaps 450 oh ladder line. A 1/2 wave radiator wis an
Good point!
-Original Message-
From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of Ashton
Lee
Sent: Tuesday, February 25, 2014 4:03 PM
To: DALE LONG
Cc: topband@contesting.com
Subject: Re: Topband: AM broadcast tower and 160m dxpedition
I would be especially mindful of
Well, he's talking about going in November - maybe in time for CQWW CW -but
probably not.
-Original Message-
From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of Joe
Subich, W4TV
Sent: Tuesday, February 25, 2014 4:10 PM
To: topband@contesting.com
Subject: Re: Topband: AM
That's not so surprising Gary !! te Way the Beverages and similar slow-wave
antennas work is that they depend on the lossy GND underneath for their
operation, so a salt marsh would not be a very beneficial GND structure
under a Beverage!
73,
Charlie, K4OTV
-Original Message-
From:
Perhaps so - but Dale is gong down there to put in a 240' broadcast tower.
73,
Charlie, K4OTV
-Original Message-
From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of Bruce
Sent: Wednesday, February 26, 2014 6:19 AM
To: topband@contesting.com
Subject: Topband: Fw: AM
Good morning, JC
Well, in its present configuration, Carl's antenna is not really a folded
monopole, although it did start our as one when he had his gamma match
connected at full height of 90'. At present he has his gamma attached at
67' - about 2/3 of the way up the tower. But that's sort of a
and have a good day!
73,
Charlie, K4OTV
-Original Message-
From: ZR [mailto:z...@jeremy.mv.com]
Sent: Sunday, February 23, 2014 11:15 AM
To: Charlie Cunningham; 'HAROLD SMITH JR'; w9...@aol.com;
topband@contesting.com
Subject: Re: Topband: from Mac Reynolds, w9evi - Rellector post
-Original Message-
From: Carl [mailto:k...@jeremy.mv.com]
Sent: Sunday, February 23, 2014 12:56 PM
To: Charlie Cunningham; 'HAROLD SMITH JR'; w9...@aol.com;
topband@contesting.com
Subject: Re: Topband: from Mac Reynolds, w9evi - Rellector post repeats
Im not talking about 2X and now youre back
...@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
I completely agree with Tom. Carl! I'd leave it alone(for the reasons that
I stated previously)! I expect that you would lose more than you would gain
by adding an inductor!! If it ain't broke don't fix it!!
You might want to put some effort into a good terminated receiving loop!
73,
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
And people DRINK this stuff!!?? :)
-Original Message-
From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of Larry
Sent: Saturday, February 22, 2014 9:17 AM
To: topband@contesting.com
Subject: Re: Topband: Control cable black conductors
Phosphoric acid is still listed.
73,
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
...@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
/22/2014 11:03 AM, Charlie Cunningham wrote:
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 he
could reduce his radial field
for several hours so no rush on the answers.
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 11:03 AM
Subject: RE
Exactly! All true and Tom is right on point! You have removed a lot of
series reactance with that gamma cage, Carl -as indicated by the required
tuning C changing.from 160 pF ot over 400 pF. OF COURSE the Q was reduced as
the series reactance was reduced and the real part stayed fairly
moisture conditions.
I'm going out for several hours so no rush on the answers.
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
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 you have a relatively
short feedline of LMR-400, You should be able to just tune it out at the
transmitter end of the line, and the LMR-400 line will be
BTW. Carl
I agree completely with Tom that there's no point in having a static-bleed
choke on a grounded shunt fed tower!
73,
Charlie, K4OTV
-Original Message-
From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of Tom W8JI
Sent: Friday, February 21, 2014 8:02 PM
To:
...@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
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
: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
: 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
Interesting! Thanks for sharing, Bruce!
73,
Charlie, K4OTV
-Original Message-
From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of Bruce
Sent: Thursday, February 20, 2014 2:16 PM
To: topband@contesting.com
Subject: Topband: 160 condx2nd CME impact
BTW, Gary
Are you using crimp-on connectors on your coax?
73,
Charlie, K4OTV
-Original Message-
From: Tom W8JI [mailto:w...@w8ji.com]
Sent: Wednesday, February 19, 2014 12:21 PM
To: Jim F.; Charlie Cunningham; g...@ka1j.com; Topband@contesting.com
Subject: Re: Topband: Coax issues
FB. Gary! Glad you got it resolved!
73,
Charlie, K4OTV
-Original Message-
From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of Gary
Smith
Sent: Wednesday, February 19, 2014 2:05 PM
To: Topband@contesting.com
Subject: Re: Topband: Coax issues
Resolution: Eat more rabbit.
Hi Gary! I'm surprised at wabbits chewing coax! Usually squirrels!
Although I would hope the coyote urine would help in any case. The little
tree rats can be really destructive!
73,
Charlie, K4OTV
-Original Message-
From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of
Wow!, that's perfect, Carl!! That should result in better than 1.2:1 load
VSWR!! No wonder you see a flat line at the transmitter end! Looks like
either 90' or 67' would be good tap points, but 67' is better! Can't do
much better than 42 ohms feed-point resistance!
If you're seeing a flat line
-boun...@contesting.com] On Behalf Of Carl
Braun
Sent: Sunday, February 16, 2014 10:49 AM
To: Charlie Cunningham
Cc: topband@contesting.com
Subject: Re: Topband: Update from AG6X shunt feed project
Thanks Charlie
I haven't transmitted on the antenna yet but I did hear KH6XX, KH6LC and
WL7E
Hi, Carl
I did a bit of further investigation and work on your problem.
I think you are done, as follows:
1.0 Just tap the Skyneedle at 90' and tune out the series inductive
reactance with a variable capacitor, leaving you with 68 ohms real at the
bottom of your drop
- Original Message -
From: Charlie Cunningham charlie-cunning...@nc.rr.com
To: j...@audiosystemsgroup.com; 'TopBand' topband@contesting.com
Sent: Friday, February 14, 2014 10:00 PM
Subject: Re: Topband: Palomar R-X Noise Bridge
All generally true, I expect, but I also believe that dielectric
...@audiosystemsgroup.com
To: 'TopBand' topband@contesting.com
Sent: Saturday, February 15, 2014 12:15 AM
Subject: Re: Topband: Palomar R-X Noise Bridge
On 2/14/2014 7:00 PM, Charlie Cunningham wrote:
All generally true, I expect, but I also believe that dielectric constant
and dielectric losses also
Sorry, Carl!
My loss tables didn't translate from HTML to the reflector. I'll re-build
the tables manually and re-send this message!
Sorry!
Charlie, K4OTV
-Original Message-
From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of Charlie
Cunningham
Sent: Saturday, February
-
From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of Charlie
Cunningham
Sent: Saturday, February 15, 2014 11:45 AM
To: 'Carl Braun'; '160'
Subject: Re: Topband: Still in search of resonance - Detailed Observations
and Calculations
Sorry, Carl!
My loss tables didn't translate from
Rodenkirch [mailto:rodenkirch_...@msn.com]
Sent: Saturday, February 15, 2014 11:45 AM
To: Charlie Cunningham; 'Carl'; Top Band Contesting
Subject: RE: Topband: Palomar R-X Noise Bridge
Carl: I've read, at several places, that sleeve baluns are effective at VHF
and above but not at HF
Well, here it is with the re-built loss table, Carl
73,
Charlie, K4OTV
From: Charlie Cunningham [mailto:charlie-cunning...@nc.rr.com]
Sent: Saturday, February 15, 2014 11:35 AM
To: 'Carl Braun'; '160'
Subject: RE: Topband: Still in search of resonance - Detailed Observations
: Topband [mailto:topband-boun...@contesting.com] On Behalf Of Carl
Braun
Sent: Saturday, February 15, 2014 3:11 PM
To: Charlie Cunningham
Cc: topband@contesting.com
Subject: Re: Topband: Still in search of resonance - Detailed Observations
and Calculations
Charlie
Thank you for your work
Hee!
-Original Message-
From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of Carl
Braun
Sent: Saturday, February 15, 2014 3:53 PM
To: Tom W8JI; '160'
Subject: Re: Topband: Still in search of resonance
Tom
After reading your post yesterday I had a dream that I woke up and
All true, but I don't thnk Carl needs to shorten his tower or remove the
yagi! I'd just use a series tuning capacitor! :-)
Charlie, K4OTV
-Original Message-
From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of Tom W8JI
Sent: Saturday, February 15, 2014 4:07 PM
To: Topband
Walt surely did know his stuff and he published some great material!!
73,
Charlie, K4OTV
-Original Message-
From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of Tom W8JI
Sent: Saturday, February 15, 2014 4:31 PM
To: Top Band Contesting
Subject: Re: Topband: Palomar R-X
That's a lot of good information, Richard! Thanks for sharing!
73,
Charlie, K4OTV
-Original Message-
From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of Richard
Fry
Sent: Friday, February 14, 2014 7:00 AM
To: topband@contesting.com
Subject: Re: Topband: Question - optimum
: Friday, February 14, 2014 10:02 AM
To: topband@contesting.com
Subject: Re: Topband: Question - optimum number of radials
On 02/14/2014 09:15 AM, Charlie Cunningham wrote:
That's a lot of good information, Richard! Thanks for sharing!
73,
Charlie, K4OTV
The whole topic of radials as it applies
Yeah, just a few elevated resonant radials can work wonders as you have
discovered, Carl! And rock does get in the way of buried radials!! The
models teach that elevated resonant radials should work very well!
73,
Charlie, K4OTV
-Original Message-
From: Topband
I would expect it to work OK with 75 ohm cable. An open-circuited 1/4 wave
line looks like a short at its sending end and you would be looking for a
null as the line reaches a 1/4 wavelength, so I would expect the method to
work fine with 75 ohm line. In fact, the 50 or 75 ohm line, if we
Makes sense. The lower the return-loss, the deeper the null!
73,
Charlie, K4OTV
-Original Message-
From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of Jim Brown
Sent: Friday, February 14, 2014 4:17 PM
To: topband@contesting.com
Subject: Re: Topband: Palomar R-X Noise
There seems to be some confusion, Carl!
First of all, since the gamma match (regardless of the diameter of the gamma
rod) is a shorted transmission line, less than 1/4 wavelength it WILL have
series inductive reactance that you will need to tune out with a series
variable capacitance.
Second, I
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