Tom (and James),
I am well aware that my comments concerning the 5/8ths wave was based upon
subjective/anecdotal evidence. I am in a science (Astrophysics) by
profession. I do know the difference. HOWEVER, I cannot completely throw
out the simple fact that when I altered my 20 meter omni
Wondered why this cable was working well. Of the cables this company is
selling it appears the only one that has its impedance (55 ohms) posted. I
decided to cut a section lengthwise to find out if the drain wire was in
fact was next to the twisted pair and it is not. It runs in a straight
),
I am well aware that my comments concerning the 5/8ths wave was based upon
subjective/anecdotal evidence. I am in a science (Astrophysics) by
profession. I do know the difference. HOWEVER, I cannot completely
throw out the simple fact that when I altered my 20 meter omni antenna for
On 9/7/2013 6:59 PM, Tom W8JI wrote:
This would also apply to an extended double zepp, where the second
antenna half makes the image unnecessary. Each half of the double zepp
is the image of the other side, so we don't need earth.
False premise alert. There are two different mechanisms
Well, I don't think of myself as a naysayer, Carl. I do offer thoughts
and
opinions on some posts on this reflector.
Why are personal insults or comments any part of how antennas work?
_
Topband Reflector
On 9/8/2013 11:48 AM, Bruce wrote:
Of the cables this company is selling it appears the only one that has
its impedance (55 ohms) posted.
The Zo of most paired cable is in the range of 60-80 ohms. You've got to
work at it to get the Zo much higher. CAT5/6/7 is speced at 100 ohms,
but with a
All,
There has been a lot of cussin', and discussin' on this reflector
regarding 5/8 wave and shorter vertical and perceived merits. There have
also been perceived insults, irritation and hurt feelings!
I spent a little time last night and some this morning modeling some of
these cases
Well it seems that somehow the document attachment got removed. I'll try
again!
Charlie
_
From: Charlie Cunningham [mailto:charlie-cunning...@nc.rr.com]
Sent: Sunday, September 08, 2013 1:13 PM
To: 'Shoppa, Tim'; 'rodenkirch_...@msn.com';
Figure 1: 1/4 wave 40m GP with 4 elevated resonant radials at 10 above
real, high accuracy GND.
Figure 2: Elevation plot for 1/4 wave GP - Peak elevation angle 22.0 degrees
Figure 3: 1/2 wave vertical radiator above 4 elevated resonant radials at
10' above real GND
Figure 4: Elevation
On 9/7/2013 6:59 PM, Tom W8JI wrote:
This would also apply to an extended double zepp, where the second
antenna half makes the image unnecessary. Each half of the double zepp is
the image of the other side, so we don't need earth.
False premise alert. There are two different mechanisms
On 9/8/2013 10:37 AM, Charlie Cunningham wrote:
Well it seems that somehow the document attachment got removed. I'll try
again!
This reflector does not accept attachments.
73, Jim K9YC
_
Topband Reflector
??
_
From: Charlie Cunningham [mailto:charlie-cunning...@nc.rr.com]
Sent: Sunday, September 08, 2013 1:13 PM
To: 'Shoppa, Tim'; 'rodenkirch_...@msn.com'; 'armst...@aol.com';
'w...@w8ji.com'
Cc: 'topband@contesting.com'
Subject: RE: Topband: 5/8
Hi Tom et al
Just wanna add the following:
Except for a 1/4 lambda vertical at the beach a la skirt with a bandwidth
from 1.7 to 8 MHz the best antenna ever used on 80 was a semivertical 2x40 m
hanging from 90 down to 25 m. That antenna was only used for SSB 80, low
noise, transmitting very well
Sorry folks - no luck getingthe document through - even whe I copied it into
the bosy of an e-mail and tried to send it to the reflector. If anyone's
interested, send me your e-mail address and I'll send it via e-mail/Outlook
to you directly.
Thanks.
Charlie, K4OTV
_
Topband
I'll do the 3/8 wave case later, Carl. I didn't have time to get back to it
today because I got all bolluxed up trying to include an attachment to my
reflector post. Also, even trying to embed the document in the body of a
reflector post didn't seem to work. Must have made the posting too large
Thanks, Jim!
Have a good Sunday afternoon/evening!
73,
Charlie, K4OTV
-Original Message-
From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of James
Rodenkirch
Sent: Sunday, September 08, 2013 3:53 PM
To: Charlie Cunningham; 'Carl'; 'Mike Armstrong'; 'Tom W8JI'; 'Shoppa,
Thanks, Augie
I finally just resorted to sending it to interested parties via e-mail.
Charlie, K4OTV
-Original Message-
From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of Augie
Hansen
Sent: Sunday, September 08, 2013 3:54 PM
To: topband@contesting.com
Subject: Re:
Hi, Carl
Well, yes, high angle radiators have a definite advantage in dealing with
hilltop or mountain top repeaters as I pointed out in one of my earlier
posts/replies. My experience with 160 is significantly more limited than my
VHF/UHF experience, and my experience with high angle radiators
-Original Message-
From: Charlie Cunningham [mailto:charlie-cunning...@nc.rr.com]
Sent: Sunday, September 08, 2013 7:04 PM
To: Jo YC0LOW; 'Jo YC0LOW'
Cc: topband@contesting.com
Subject: FW: Verticals - 1/4. 1/2 and 5/8 wave - Hope this works
Hello, Jo!!
Good to hear from Indonesia!!
Hi Bob thanks for the reply. My question wasn't as clear as it could have been
so let me try again. Say we have 2 stations with isotropic transmitting
antennas and receiving antennas with good angular discrimination at each end of
a certain path. VOACAP predicts that X% of the openings will be
I was reading a post from the past about the FO0AAA delta shaped receive
antenna used on 160.
I states in the post that they used CAT5, using just two twisted wires feeding
the receiving loop rather
than coax. They said the CAT5 was much better than using coax with a choke. I
got the
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