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Antenna analyzer vs feedline type Sep 21st 2012, 14:37 1 1,259 on 21/9/12
USB to Serial Port problems--Prolific Drivers Aug 3rd 2012, 18:27 1 1,518 on 3/8/12
Italian Phishing emails! Dec 13th 2011, 14:20 1 1,311 on 13/12/11
John K0GMO needs help designing SS Amp Nov 17th 2011, 15:53 1 1,193 on 17/11/11
1 Farad Capacitor to Eliminate Headlight Flicker? Oct 19th 2011, 13:14 4 2,050 on 9/11/11
History of Relay Rack Dimensions? Oct 17th 2011, 12:58 2 1,405 on 25/10/11
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Stealth Antenna wire Sep 12th 2011, 12:51 2 1,803 on 13/9/11
Designing a ham bench Aug 29th 2011, 12:38 2 1,886 on 29/8/11
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Latest Posts

Topic Author Posted On
Email forwarding question n1chu 7 hours, 7 minutes ago

You should use the account where email is forwarded. It sounds like you have a Comcast account--you should use that.

Zack W1VT
ARRL Senior Lab Engineer
One Antenna or Two for HF/VHF/UHF pmc181 5 days, 7 hours ago

Do you want to talk on the radio? The only HF band that lets you talk is 10 meters--I'd suggest a simple 10 meter vertical or dipole. How loud you are really makes a difference on voice. On data or CW, not so much, so you can make more of a compromise and still do quite well.

You might talk to the locals about the scene on VHF/UHF. In some places, nearly all the activity is on 2M. But, in others, 70cm is also a popular band.

Zack W1VT
ARRL Senior Lab Engineer

extended double zep yagi antenna oct 2014 qst K7AZW 6 days, 23 hours ago
I've optimized this design for operation at 14.175 MHz.

The length of the driven element is 1046 inches of #18 silky wire (0.02” of 2.25 dielectric constant insulation).
The reflectors are 402.5 inches with a 241 inch gap. With a height of 47 feet, start with 489 inches open wire feeder (91% vf, 550 ohms).

If #14 THHN house wire is used, the driven element should be 1048 inches, and the reflectors 403.5 inches. Start with 485 inches of open wire and trim for best SWR.

For bare #14 copper wire, the driven element should be 1068 inches, and the reflectors 413.5 inches. Start with 486 inches of open wire and adjust for best SWR.

Zack Lau W1VT
ARRL Senior Lab Engineer

Yaseu FT 102 brakemanbobsmith 2 weeks, 1 day ago

Malcolm NC4L has contact and bio information here

Zack Lau W1VT
Upgrade MFJ 784? WA2SAY 2 weeks, 2 days ago
Firmware Upgrade
For MFJ-784 users, order MFJ-55, $29.95 Most software features of the new MFJ-784B.

A firmware upgrade is typically a programmable chip with the new software.

Zack Lau W1VT
ARRL Senior Lab Engineer

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