Look closely and you may see a hairline crack on the bad one.
Also look for other possibilities. A number of times I've swapped out
bad matching capacitors without solving the problem, only to find
later it was simply an oxidized connection that needed to be cleaned up
and tightened down.
Jamie,
When I had a problem like that on a matching system, I had someone else key
the transmitter and watched the feedpoint at night. It took ten seconds to
see the problem ! Fireworks had nothing on what happened.
73
Don, G3BJ / G5W
-Original Message-
From: Topband
But what about an element loaded with a coil at the center or at the top?
Would there be advantages to that approach that would come close to the
short verticals with top-hat wires, or any serious disadvantages?
Jon,
The reason I use the hats and do everything I do in the elements is
Still I am intrigued by the thought of a remote tuning capacitor via
hydraulic tubing :-). The capacitor plates could be as simple as two
concentric cylinder conductors with appropriate spacers. I betcha crud
collecting on the top of the oil would set voltage limit.
I would be as concerned,
Thanks, everyone. I had not thought about the possible difference
between 600M and 160 in terms of heating. Jon's suggestion of using big
old micas sure seems like a good one if I can find what I need. As a
refugee from the BC-610 era I'm amazed that any are still around!
--
73, Pete N4ZR
I have used this same setup for my 4-square 160m receive array for years.
Since I have to take down and put up this array every spring/fall, I have to
re-tune each element for the 160m band. I have found that the base loading
does not have to be exact for the system to 'work'. Last year I
Some of my best Antarctic area contacts have been with a horizontal antenna
and the very best had the apex at only 50' and the end at 3blew the
pileup away with one call and was told later at Dayton I was at least 10dB
above the 10 KHz+ of callers. Not bad for a fast installed antenna at
Wouldn't 1 5/8 hardline make a better HV RF capacitor?
Herb, KV4FZ
On 1/29/2014 11:34 PM, HAROLD SMITH JR wrote:
Jamie,
The VSWR would change because the arc would change the impedance at the Arc
point. From perhaps several hundred or thousand ohms to
near Zero during the Arc..
73, Price
Hello to the group
I'm a newbie to 160 having only participated in various contests over the
course of the last two years. I used an 80 meter aluminum tube vertical with a
Reyco trap affixed to the top with a horizontal L: wire heading over to the
palm tree. I've since converted that
Ok Frank I will forward this to the Topband reflector.
Bernie McClenny, W3UR
Editor of The Daily DX and The Weekly DX
www.dailydx.com
410-489-6518
Sent from my iPhone
On Jan 30, 2014, at 10:56, donov...@starpower.net wrote:
Hi Burny,
When you have a chance, please forward this email to the
I have been getting emails from KV4FZ talking about not being able to post
to the list. Emails directly to him are bouncing. I will try this channel
as the message applies to a few others who are having the same issue.
If your email does not show up here right away - the most likely reason is
Hi Doug,
A few notes about the short verticals in my 160M passive
receive array. I use them in my W8JI broadside-endfire
passive array described in detail on Tom's home page
and on W5ZN's home page.
Its important to understand that the loss in the radial system
of a 160M passive receive
I've asked the local cable installers if they have any extra hardline
no cigar. I need around 400' of it so Andrews is out of the
question. I'd like the 50 ohm line but will probably have to settle
for aluminum jacketed 75 ohm line.
Any suggestions where else I might look to find something
Have you tried the actual cable companies? My local Cableone cable service
gave me a spool with about 800 ft on it. At the time, they had probably 6 -
8 spools with odds lengths in their yard, so giving one away was no big
deal.
Sometimes a case of beer helps make a deal!
Ray,
N6VR
Chino Valley
I might have some big micas that would work. What value would you
need?
Gary
KA1J
Thanks, everyone. I had not thought about the possible difference
between 600M and 160 in terms of heating. Jon's suggestion of using big
old micas sure seems like a good one if I can find what I need. As a
You might be dealing with AM BCB being detected by the meter - and masking
what you are looking for.
No, because he gets a dip to zero reactance.
If that happens anywhere, there is no BCI.
73 Tom
_
Topband Reflector Archives - http://www.contesting.com/_topband
Very true but the RF is still in the oil dielectric from the coax
connector to the hot end of the resistor.
Not the same at all.
Loss tangent is meaningless in the dummy load application because impedance
is low (weak electric field). There is very little displacement current
compared to
Good suggestion Ray.
When I moved to this QTH was TIGHT... I went to the local Cable Co. and
spoke to the line Boss.
He gave me all the cable ends I wanted I originally feed my 4 towers with
3/4 75 ohm Catty hardline.
Give'em a try .
Wayne W3EA
PS I also had permission to
At the speeds that deer run across an open field, I doubt that repellant will
help.
Seven foot fence posts work perfectly, and they will last a lifetime!
73
Frank
W3LPL
- Original Message -
From: Gary Smith g...@ka1j.com
To: Topband@contesting.com
Sent: Thursday, January 30,
I don't know about anyone else's cable company, but when the prices of
scrap metal went up a few years ago Comcast emptied out their local
scrap yard. Actually, I'm just supposing that's the reason. I got a lot
of good stuff there while they were willing to let it go.
73, Pete N4ZR
Check out
A possible answer might be here:
http://www.legupenterprises.com/
Doesn't faze the deer around here. They come right up to the house and
the fenced kennels and munch on whatever they like. That stuff may do
something with the small animals but the Eagle, Great Horned Owl, Red
Tail Hawk and
Thanks for this tidbit of information. As soon as this white manure melts
(some people call it snow) I will do a re-check on my shunt fed tower. I
think I did have at least one dip to zero and never did find a resonance
point.
Thanks
Chet N4FX
-Original Message-
From: Topband
Here is another update from 8Q7BM;
Wednesday evening FT5ZM started so I moved away from 23.7 to 33.7. I was
calling from about 1430 and on. Heard OH5KW 579 during the evening and logged
VK3EW and A45XR. Other than that it was FT5ZM and their weak pileup heard here.
On Thursday morning I
Thanks for all the input received.
In short it seems like lifting the coil would not do much difference.
Raising/increasing the angle of the top loading spokes might be the better
option.
Then of course moving the antenna to the water and improving the radials
including some going into the
Tom
Maybe you saw my post where I stated that the MFJ plunged to a minimum
reading of 4 0hms at 1825? Does this reading mean that the L is near ground
potential and 'in union' with the grounded Skyneedle at that freq?
It could be from a few things, but two closely spaced conductors, with
25 matches
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