Re: Topband: DC bias tee question

[Tom W8JI]

I've been looking at the Shared Apex Loop, and one thing I am puzzled by 
(among many) is that the bias tee/DC coupler circuit has both sides of 
the 75-ohm feed coming in from the antenna and the DC supplied to the 
coupler totally isolated from ground, while the ground side of the coax 
going to the receiver is connected to ground.  Having recently been 
totally defeated in building a bias tee of my own for receive antenna 
switching, I wonder if maybe this is a subtlety of the design that had 
escaped me.



That makes no difference in function.
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Topband Reflector Archives - http://www.contesting.com/_topband

Topband: DC bias tee question

[Pete Smith N4ZR]

I've been looking at the Shared Apex Loop, and one thing I am puzzled by 
(among many) is that the bias tee/DC coupler circuit has both sides of 
the 75-ohm feed coming in from the antenna and the DC supplied to the 
coupler totally isolated from ground, while the ground side of the coax 
going to the receiver is connected to ground.  Having recently been 
totally defeated in building a bias tee of my own for receive antenna 
switching, I wonder if maybe this is a subtlety of the design that had 
escaped me.


Can anyone clear this up? I'll be glad to share the schematic if the 
above isn't enough information.


--
73, Pete N4ZR
Check out the Reverse Beacon Network at
http://reversebeacon.net,
blog at reversebeacon.blogspot.com.
For spots, please go to your favorite
ARC V6 or VE7CC DX cluster node.

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Topband Reflector Archives - http://www.contesting.com/_topband

Re: Topband: Dayton Top Band Dinner

[MU 4CX250B]

Very cool! Thanks!
Jim W8ZR

Sent from my iPhone

>
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Topband Reflector Archives - http://www.contesting.com/_topband

Topband: Dayton Top Band Dinner

[Craig Thompson]

Hello

The Google Earth presentation was made using the log from FT5ZM.

The log was first filtered for 160m QSOs. I had to add the grids to each
station. I did that by importing into DXKeeper...a module of DXLabs and
using the XML feed from QRZ.com to add the grid data.
http://www.dxlabsuite.com/dxkeeper/

The ADIF was exported and then imported into QScope.org Then it was
processed for a KML file and downloaded to my computer using the
Grid Locator KMZ
file
If you have downloaded and installed Google Earth, you can just click on
the KMZ file to open the program.

You need to turn on the day/night function and then using the time lapse
control to move through the time lapse. You will not see the stations
worked unless you add some time delay. I usually use 1 to 2 hours. This
keeps the Stations indicated for a few seconds while running the time
lapse.

This was recorded using SnagIt software as a MP3 and then imported into the
PowerPoint Presentation software.

http://www.techsmith.com/snagit.html

http://office.microsoft.com/en-us/powerpoint/

I will be showing this PPT at the W9DXCC in September. After that, I will
post the videos on YouTube for anyone to see.

73, Craig K9CT
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