ARRL

W1VT

Joined: Sat, Apr 4th 1998, 00:00 Roles: N/A Moderates: N/A

Latest Topics

Topic Created Posts Views Last Activity
Antenna analyzer vs feedline type Sep 21st 2012, 14:37 1 1,313 on 21/9/12
USB to Serial Port problems--Prolific Drivers Aug 3rd 2012, 18:27 1 1,564 on 3/8/12
Italian Phishing emails! Dec 13th 2011, 14:20 1 1,333 on 13/12/11
John K0GMO needs help designing SS Amp Nov 17th 2011, 15:53 1 1,216 on 17/11/11
1 Farad Capacitor to Eliminate Headlight Flicker? Oct 19th 2011, 13:14 4 2,089 on 9/11/11
History of Relay Rack Dimensions? Oct 17th 2011, 12:58 2 1,435 on 25/10/11
Miswired Selsyn Oct 13th 2011, 17:51 1 1,275 on 13/10/11
Stealth Antenna wire Sep 12th 2011, 12:51 2 1,838 on 13/9/11
Designing a ham bench Aug 29th 2011, 12:38 2 1,926 on 29/8/11
Can't find recent Hint and Kink Aug 26th 2011, 13:01 1 1,851 on 26/8/11

Latest Posts

Topic Author Posted On
Gamma Match Question qed479 1 week, 1 day 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 2 weeks, 5 days 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.

https://groups.yahoo.com/neo/groups/WINMOR/info
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.

http://aintel.bi.ehu.es/psk31.html
http://physics.princeton.edu/pulsar/K1JT/
http://www.w1hkj.com/Fldigi.html

Zack W1VT
ARRL Senior Lab Engineer




Email forwarding question n1chu 3 weeks 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 3 weeks, 5 days 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 4 weeks 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

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