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Circuit Board Construction Question Mar 23rd 2012, 13:10 4 2,809 on 15/9/13
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Switching Open Wire Feedline Bewtween a Transmitter and Receiver? Aug 8th 2011, 13:34 1 3,259 on 8/8/11

Latest Posts

Topic Author Posted On
Attic Antennas apr1350 20 hours, 53 minutes 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 6 days, 16 hours ago
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 1 week, 2 days ago
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
Antique keyers -- value? W0SJF 4 weeks, 1 day ago
I presume you mean Semi-automatic keys, such as Vibroplex, SpeedX and McElroy, or keyer paddles, such as like Bencher, Begali.

In my opinion, unless the item is exceptionally rare, items of technology are worth more if they are clean and look new. A search on eBay shows items that look new go for a premium.
Some people put in a lot of effort to totally rebuild a radio chassis, for example, with new silk screening on the front panel. That's worth much more than an original splotchy/dirty chassis.

Bob Allison
ARRL Laboratory
Looking to buy Antenna Analyzer tdezellem 4 weeks, 1 day ago

QST has reviewed many antenna analyzers during the past few years. I think the easiest way to find them is to look over the "Product Reviews Listed By Issue":

If you know the make and model number, you can also look under "Product Reviews Listed By Manufacturer":

Our reviews are un-biased; we provide a fair and honest review of equipment we purchase off the shelf. We do not review equipment given to us by manufacturers. We also provide our members with top-rate test data, as measured in our Laboratory. We cannot tell you what to buy, we can point you in the right direction that gives you the information needed to make your own decision.

Bob Allison
ARRL Laboratory

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