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QST Downloads Feb 19th 2016, 16:34 3 1,874 on 19/3/18
March 2016 QST Compact Multiband Dipole Feb 19th 2016, 15:23 1 1,328 on 19/2/16
Antenna analyzer vs feedline type Sep 21st 2012, 14:37 1 3,215 on 21/9/12
USB to Serial Port problems--Prolific Drivers Aug 3rd 2012, 18:27 2 3,876 on 26/12/15
Italian Phishing emails! Dec 13th 2011, 14:20 1 2,848 on 13/12/11
John K0GMO needs help designing SS Amp Nov 17th 2011, 15:53 1 2,690 on 17/11/11
1 Farad Capacitor to Eliminate Headlight Flicker? Oct 19th 2011, 13:14 4 4,355 on 9/11/11
History of Relay Rack Dimensions? Oct 17th 2011, 12:58 2 2,902 on 25/10/11
Miswired Selsyn Oct 13th 2011, 17:51 1 2,862 on 13/10/11
Stealth Antenna wire Sep 12th 2011, 12:51 2 3,522 on 13/9/11

Latest Posts

Topic Author Posted On
KPC-3 TNC KISS mode.... what am I doing wrong? jclausen 1 week, 4 days ago

Have you searched the TAPR archives? A lot of hams haven't played with packet modems for over a decade.

Zak W1VT
ARRL Senior Lab Engineer
connections KM4NSV 2 weeks, 2 days ago
You may be able to use crimp connectors instead of soldering.

Conductive epoxy is prohibitively expensive. Not only is the cost high, but the shelf life is short.

Also, according to an MSDS sheet I just read you can get eye and skin irritation. It recommends gloves and eye protection.

Zak Lau W1VT
ARRL Senior Lab Engineer
End fed wire antenna ... workable?? w1eek 2 weeks, 3 days ago
A vertical is inferior to a high half wave dipole or Yagi aimed in the right direction, but you don't have that option. The biggest issues with verticals is local noise pickup and an inadequate radial system. You may find the metal roof to be usable as the counterpoise.

A large loop can work well for short distance contacts on the low bands but it won't have enough height to do better than a vertical using the roof as the counterpoise.

But, the only way to be sure is to put it up and try it out.

I was quite surprised with my 80 meter wire vertical hung in the trees. Not only was I able to work DX with 100 watts, but it only took me 3 months to collect all the QSLs I needed for 80M DXCC and finish my 5 Band DXCC!

Zak Lau W1VT
ARRL Senior Lab Engineer

End fed wire antenna ... workable?? w1eek 2 weeks, 3 days ago
A vertical is usually a better choice in your situation.

While the roof should be usable as the radial or counterpoise for an end fed wire, the short distance between the horizontal wire and the roof will make it hard to get acceptable performance. Also, if you are looking for DX it is likely that you don't have enough height--you typically want at least 35 feet above ground on 20 meters.

An electrically short efhw typically requires a good radial system or counterpoise for good efficiency. This is less important if you have a resonant half wave or multiple but you don't have that.

But, even a poor system may be usable on the digital mode FT8 or CW for making very short contacts.

Zak W1VT
ARRL Senior Lab Engineer
stacked 2 meter halo antennas SIZE358 4 weeks, 1 day ago
The stacking distance also depends on the height above ground. Typically you want to eliminate the useless lobe that goes straight up.

In a mobile situation you have a height limit.

Msquared suggests 82 and 132 inches as the heights of each antenna.

Zak W1VT
ARRL Senior Lab Engineer

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