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Antenna analyzer vs feedline type Sep 21st 2012, 14:37 1 1,323 on 21/9/12
USB to Serial Port problems--Prolific Drivers Aug 3rd 2012, 18:27 1 1,570 on 3/8/12
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John K0GMO needs help designing SS Amp Nov 17th 2011, 15:53 1 1,223 on 17/11/11
1 Farad Capacitor to Eliminate Headlight Flicker? Oct 19th 2011, 13:14 4 2,098 on 9/11/11
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Designing a ham bench Aug 29th 2011, 12:38 2 1,932 on 29/8/11
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Latest Posts

Topic Author Posted On
Gamma Match Question qed479 1 week, 4 days ago

In most cases, it is impractical to close off the end of an aluminum tube electrically in a fashion that will hold up to the rigors an antenna must endure.

Zack W1VT
ARRL Senior Lab Engineer

WINLINK TNC N2PHI 3 weeks, 1 day ago

Pactor is used for HF Winlink nodes, but the hardware modems used are expensive.

There has been a trend to skip using hardware modems and use the computer to handle the software functions of a TNC.
Winmor is a software alternative to a Pactor modem.

On HF, hams will use software programs with a simple hardware interface to operate modes like PSK31, JT65, and RTTY. I've heard that MARS (Military Affiliate Radio Service) uses FLDigi and MT63.

Zack W1VT
ARRL Senior Lab Engineer

Email forwarding question n1chu 3 weeks, 3 days 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 4 weeks, 1 day 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 on 24/9/14
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

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