Top Ten Videos of My Channel

 Here is a compilation of top 10 most popular videos on my channel.



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Have you heard of zBITX?

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 Well, I had not heard till I read the program schedule of LARC-7 today. Most of you would be familiar with uBITX which has gone up to version 6. Some of you would be aware of sBITX, which is quite an advance over uBITX. Almost daily I am meeting a new uBITX user on the band, most of them using additional linear amplifiers. That made me join the BITX group on groups.io , where I am getting messages from uBITX and sBITX users from all sides of the globe. Still I was not aware of zBITX and that made me look around and came across two references. One was the video of a talk by VU2ESE at QRP ARCI . Another was an email in the BITX groups.io which was citing the former. zBITX is a new transceiver from VU2ESE based on Raspberry Pi Zero for 20W, having CW skimmer and FT8 modes in addition to the regular SSB mode and waterfall display which the sBITX also has. zBITX is quite small, just 3" x 3" x 1.5" in size. It is a Raspberry Pi Zero based 20 W software defined radio which h...
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Debut Ham Radio Technical Discussion Net on 7065 kHz, 1:45 am UTC (7.15 am IST)

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Started by calling CQ on 7065 kHz using my automated CQ call which I had described yesterday. VU3RFT joined first followed by VU2EHA. Had a good discussion on Center Fed and End Fed Dipole Antennas. VU2EHA and VU3RFT participated. All of us were using inverted V dipole antennas. VU2EHA had 40 and 20m dipoles on same mast. VU3RFT was using 1:1 current balun. I mentioned that I am using 40/10m center fed dipoles with 1:1 current balun. VU2EHA asked about 15m dipole. I suggested that the 40m dipole will work well on 15m as it is an odd harmonic. He mentioned a problem because his IC-718 does not have an autotuner. We lost propagation at around 7.35 am IST. Wonder whether there was a geomagnetic storm? Number of waterfalls on 40m band decreased very much at that time. Planning to try again tomorrow at the same time. SWLs can monitor at  http://vu3wew.ddns.net:8073/ , the OpenWebRX by VU3WEW, located about 10km from here and likely to pick up my signals very well. Being a WebSDR, it can...
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What is a PIN diode?

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 PIN diode is a diode with an additional undoped region of intrinsic semiconductor. Usual diodes have P and N types of semiconductors meeting at a junction. For PIN diode, the I or intrinsic region is between the P and N type regions. The P and N type regions may be heavily doped and used for ohmic contacts. The intrinsic region makes a PIN diode inferior as a rectifier compared to PN diodes. But PIN diodes are suitable for attenuators, fast switches, photodetectors and high voltage power electronics applications. Intrinsic region is flooded with charge carriers from P and N regions in what is known as high level injection. PIN diodes will conduct current once the flooded electrons and holes reach an equilibrium point with equal number of electrons and holes in the intrinsic region. While the PIN diodes functions like a standard diode at low frequencies, it works almost like a perfect resistor at high frequencies even for large signals. The high frequency resistance is inversely pr...
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