A demonstration of how a seperate receiving antenna can help HF radio reception, particularly in urbanised areas where noise is a problem.
A large outdoor antenna is best for transmitting but for receiving a small loop can often pick up less noise and allow clearer reception.
This is a demonstration of the difference an indoor loop antenna can make when listening to a ZL station in a contest on 160 metres.
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https://www.youtube.com/watch?v=S5L5K7stn4E
A very simple circuit to generate harmonics. For receiver testing.
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https://www.youtube.com/watch?v=QMDX-iSnD4M
Not your ordinary 7 MHz dipole. This works on all bands up to 28 MHz. It achieves this with a home made tuned feedline and balanced antenna coupler which is described in the video. The antenna is 20 metres from end to end while the feedline is about 8m long (neither critical).
I only had room for 5 switches so omitted the 0.1 uH and 6.4 uH coils that VU2ESE used. Not having the latter may mean the coupler doesn't match all antennas on 3.5 MHz. I rarely operate there while portable so this doesn't matter.
The source for the coupler circuit was VU2ESE's website at: http://hfsignals.blogspot.com.au/2015/06/a-balanced-tuner.html
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https://www.youtube.com/watch?v=KLSqfgvGg8M
Contacts with QRP stations with the BITX40 QRP transceiver. Stations contacted were running between 100mW and 10 watts output. The contacts show the importance of a good receiver.
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https://www.youtube.com/watch?v=2o4p_MEeYSA
The inbuilt free-running VFO in the Bitx40 isn't the most stable. This video shows how with few parts you can add a ceramic resonator VXO and obtain better stability. Tuning is also easier as the range can be split into several segments.
Bitx40 original circuit at http://www.hfsigs.com/bitx40v3_circuit.html
My review of the Bitx40 https://www.youtube.com/watch?v=1EvA6Q6C2rE
Note: Bitx40s now come with a DDS frequency synthesiser. However this is on a separate board and you can still do this modification and use the synthesiser for another project.
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https://www.youtube.com/watch?v=10109ueIEO0
Contacts from Olivers Hill on Sunday 12 January 2014. Activity took place from 7am to noon. Stations worked were in vk1, 3, 5 & 7.
The video shows the good conditions between VK3 and VK5, with FM contact also achieved. Also noteworthy was a VK7 contact made by bouncing the signal off a hill to the north.
Around 60 contacts were made, making it a highly succesful outing.
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https://www.youtube.com/watch?v=mYOBxUYq8JM