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QST Downloads Feb 19th 2016, 16:34 3 4,996 on 19/3/18
March 2016 QST Compact Multiband Dipole Feb 19th 2016, 15:23 1 2,954 on 19/2/16
Antenna analyzer vs feedline type Sep 21st 2012, 14:37 1 4,600 on 21/9/12
USB to Serial Port problems--Prolific Drivers Aug 3rd 2012, 18:27 2 5,455 on 26/12/15
Italian Phishing emails! Dec 13th 2011, 14:20 1 4,196 on 13/12/11
John K0GMO needs help designing SS Amp Nov 17th 2011, 15:53 1 4,155 on 17/11/11
1 Farad Capacitor to Eliminate Headlight Flicker? Oct 19th 2011, 13:14 4 6,014 on 9/11/11
History of Relay Rack Dimensions? Oct 17th 2011, 12:58 2 4,229 on 25/10/11
Miswired Selsyn Oct 13th 2011, 17:51 1 4,353 on 13/10/11
Stealth Antenna wire Sep 12th 2011, 12:51 2 4,930 on 13/9/11

Latest Posts

Topic Author Posted On
Field Day Battery Operation W1ECH 1 day, 5 hours ago
6.9. Batteries may be charged while in use. Except for Class D stations, the batteries must be charged from
a power source other than commercial power mains. To claim the power multiplier of five, the batteries must be
charged from something other than a motor driven generator or commercial mains.
Virtual Meetings NO4T 4 days, 2 hours ago
Zoom has been suggested but they have issues with the sudden influx of users and hacking.

It may be a good idea to do some testing beforehand to make sure everyone has the hardware they need and that it is installed properly. Not everyone uses a computer with a headset and web cam.
Kenwood tw-4000A where to begin KN6CWJ 4 days, 7 hours ago
That radio draws 6 or 7 amps on transmit so you may be over loading that power adapter. You will need a heftier power supply that can supply the full transmit draw for testing. I'd suggest at least 7 amps.

Zak W1VT
ARRL Senior Lab Engineer
Suggestion 80 Meter Antenna N8KDC 1 week, 1 day ago
I'd suggest a half wave dipole supported at the center by the tower. It can be bent into an inverted Vee to use available supports. Feed it with coax to an antenna switch. A choke balun would be useful for getting rid of common mode noise. I'd use 17 turns of RG-400 Teflon coax on an FT-240-43 core.
You may be able to add wires for 40M with minimal interaction if they are offset by 15 degrees or more.

Zak Lau W1VT
ARRL Senior Lab Engineer
PCB Manufacturer WA2FTV 1 week, 3 days ago

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