Will an unbalanced coupler work with tuned feeder dipoles?
One 'should' use a balanced antenna coupler with balanced antennas such as tuned feeder dipoles. But what if you only have an unbalanced coupler eg an L-match? Can you get away with using an unbalanced coupler with a balanced antenna? Watch this video to find out!
HT gathering dust? Here's 5 ideas for you to get the most from your US Technician ham license. Presented by Peter Parker VK3YE/AK3YE.
Important links:
RepeaterBook: https://www.repeaterbook.com/row_repeaters/
Satellites: https://amsat.org
POTA: https://pota.app
KiwiSDR: https://kiwisdr.com/public/
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https://www.youtube.com/watch?v=2uAM-I5IQTQ
In which I go to a local park and transmit as my first POTA activation.
Contents
0:00 Introduction to POTA
1:56 Selecting operating site
2:14 Setting up and antenna
3:36 On air and making contacts
7:12 Summary of contacts and packing up
8:16 Books
PS: If you liked this video please consider supporting Amateur Radio VK3YE by:
* Subscribing on YouTube
* Checking my books page at https://books.vk3ye.com
* Shopping on Amazon via: https://amzn.to/3iiDQXv, or
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(then if you buy something I'll get a small commission at no cost to you)
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https://www.youtube.com/watch?v=PqT2p4oE0nk
Variable capacitors and inductors can be quite expensive. Especially if they come with a vernier reduction drive. Can a cheap pipe cutter and a few other salvaged parts be made into one?
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https://www.youtube.com/watch?v=i-5Kn5d08hE
Receiving VK3XU's CW beacon on 137kHz from about 50km away just after noon on a Saturday.
Despite the milliwatts of ERP the signal is fully readable, even when using just the ferrite rod on the converter. A larger antenna loosly coupled to the ferrite rod improves signals further and suprisingly does not introduce too much more noise.
While many amateur transceivers can receive down to 100 kHz, reception is often poor if it is just used with a random wire antenna. Instead it is better to use a selective up-converter with some sort of tuned antenna. This converter, also designed by VK3XU, uses an NE602 and converts signals to a 4 MHz tunable IF.
More info including frequencies and times: http://www.wia.org.au/newsevents/news/2009/20090827-1/index.php
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https://www.youtube.com/watch?v=Z8opnlVjWD8
Most HF pedestrian mobile activity seems to be on 14 - 28 MHz, where it's easier to build efficient portable antennas. However due to its activity and propagation 7 MHz is also an excellent mobile band.
In this video I compare copper and aluminium magnetic loops of different construction. You'll hear contacts from a single afternoon's pedestrian mobile operating on 7 MHz.
The tests demonstrate that HF pedestrian mobile with easily carried antennas is both effective and practical. Stations worked were between about 300 and 1500km distant.
A constructional article for the aluminium loop appears at vk3ye.com
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https://www.youtube.com/watch?v=YswnVmAKSP0
A simple crystal set capable of driving low impedance headphones. Inspired by article in February 2019 Silicon Chip magazine. Uses electret microphone as detector.
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https://www.youtube.com/watch?v=b5FHOY_booE
Listening to the 160m AM 'Coffee Break' net from Flinders jetty. Video also features reception of the VK3XPT 10m beacon. Date 31 October 2018 11am local time.
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https://www.youtube.com/watch?v=GhZj8Fdg9uU
Signal reports from other stations aren't foolproof, with many giving 5/9 reports to stations they hardly hear. So what are some other ways to establish whether your QRP station is effective?
Watch this video to find out!
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https://www.youtube.com/watch?v=6L9wBSsU7WA