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March 2016 QST Compact Multiband Dipole Feb 19th 2016, 15:23 1 5,200 on 19/2/16
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USB to Serial Port problems--Prolific Drivers Aug 3rd 2012, 18:27 2 7,785 on 26/12/15
Italian Phishing emails! Dec 13th 2011, 14:20 1 6,387 on 13/12/11
John K0GMO needs help designing SS Amp Nov 17th 2011, 15:53 1 6,416 on 17/11/11
1 Farad Capacitor to Eliminate Headlight Flicker? Oct 19th 2011, 13:14 4 8,476 on 9/11/11
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Miswired Selsyn Oct 13th 2011, 17:51 1 6,471 on 13/10/11
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Latest Posts

Topic Author Posted On
Satellite using an HT KB8VHI 3 days, 23 hours ago
"It is preferable to work the FM sats in full-duplex mode (where you can hear the downlink as you key your mic). But only one recently manufactured HT did that well in V/U and U/V modes: the Kenwood TH-D72a (discontinued 4Q 2020)"

In practice most dual band radios desense too much on receive so it is often more practical to use two radios if you are on a budget.

Zak W1VT
ARRL Senior Lab Engineer
What Determines How Many Watts an Antenna Can Take? jgaz 1 week, 2 days ago
There are now infrared cameras sold to consumers. Some are phone attachments. These can be used to verify the expected temperature rise of antenna components.

Even better would be to use a professional grade camera used by fire departments. Perhaps they would be willing to come out with their gear to make sure there are no issues in your attic.

Zak W1VT
ARRL Senior Lab Engineer
Yaesu 897D display isdues NO8RF 2 weeks, 1 day ago
Yaesu FT897
Yaesu FT897 Owners Support Group
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ARRL EFHW KIT dkoczur 2 weeks, 1 day ago
Tom realized that hams have to compromise, and offers his opinions on several popular choices.
ARRL EFHW KIT dkoczur 2 weeks, 3 days ago
NEC says to ground the mast and feedline. They do not specify grouding a matching transformer.

In some cases a CMC may help but it is usually not necessary. There is no straightforward method of optimizing a CMC on an "all band" antenna.

No, NEC does not require that the power supply and transceiver bonding be run out to separate ground to the lightning arrestor ground.

Zak W1VT
ARRL Senior Lab Engineer

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