ARRL

WB1GCM

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

Latest Topics

Topic Created Posts Views Last Activity
Circuit Board Construction Question Mar 23rd 2012, 13:10 4 2,829 on 15/9/13
10 Meter AM Nov 14th 2011, 19:24 4 2,927 on 14/12/11
Baofeng UV-3R Harmonic Fix Nov 11th 2011, 14:18 1 3,128 on 11/11/11
Novice Trivia Question: 10 meters Oct 26th 2011, 18:55 2 2,298 on 1/11/11
European AM'er Needs Help Aug 25th 2011, 19:45 3 2,329 on 23/11/11
How to Set the Temperature Setting On a Soldering Station Aug 16th 2011, 12:18 1 3,541 on 16/8/11
How to Remove Cigarette Smoke from a Newer Solid State Transceiver? Aug 8th 2011, 18:15 7 5,667 on 6/10/15
Switching Open Wire Feedline Bewtween a Transmitter and Receiver? Aug 8th 2011, 13:34 1 3,288 on 8/8/11

Latest Posts

Topic Author Posted On
QST mobile reader which does not suck? piranha32 3 weeks, 6 days ago
Feedback forwarded....they are working on it!
QST mobile reader which does not suck? piranha32 3 weeks, 6 days ago
Thank you for your feedback, Jacek. I will pass this thread on to our publishers.

Bob Allison
WB1GCM
ARRL Laboratory
Attic Antennas apr1350 4 weeks, 2 days ago
Make certain that the wire antenna does not touch anything. Use insulators at the end of each wire. Depending on frequency, length of the antenna and input impedance, very high voltages may be present.
ARRL QST Android app is Potentially Dangerous NS6Q on 20/7/16
If a member downloads a PDF of the entire magazine, he/she could then share that file with the rest of the world. At that point, they would be giving away the magazine. Membership would decline, funds would lost and the only substantial advocate for Amateur Radio (the ARRL) would be diminished. The app, however poor, is needed to protect copyrighted material.
power loss in tuner ? AB3FN on 18/7/16
See our past Product Reviews of Antenna Tuners. We publish a loss chart. Most of the time, losses are under 10%, sometimes only 1 or 2 %. A loss of 10% is less than a 1 dB loss, which does not make a difference at the other end.

However, if you are loading up a very short antenna, with an impedance that is very low, you will have a much higher loss. Many tuners exhibit a 30% loss with a 12 Ohm load. At the legal limit, that's 450 Watts that's lost in the tuner. That much power lost means something inside the tuner will fail, quickly. That's why it's important to read our reviews.

As far as calculating the loss, there are too many factors involved to easily calculate that. If good quality components are used, the loss will be less.

Bob Allison
WB1GCM
ARRL Lab

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