nandusthoughts.blogspot.com
Ham RadioHam Radio Blog of VU2NAN - NANDU. Contacts, QSL Cards, Remembering Old-Timers, Vintage Methods/Components/Equipment & Troubleshooting - a perspective.
http://nandusthoughts.blogspot.com/
Ham Radio Blog of VU2NAN - NANDU. Contacts, QSL Cards, Remembering Old-Timers, Vintage Methods/Components/Equipment & Troubleshooting - a perspective.
http://nandusthoughts.blogspot.com/
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Ham Radio | nandusthoughts.blogspot.com Reviews
https://nandusthoughts.blogspot.com
Ham Radio Blog of VU2NAN - NANDU. Contacts, QSL Cards, Remembering Old-Timers, Vintage Methods/Components/Equipment & Troubleshooting - a perspective.
nandusthoughts.blogspot.com
Ham Radio : Lightning jolt
http://www.nandusthoughts.blogspot.com/2015/03/lightning-jolt.html
It was a typical summer afternoon in the year 1977. I was working CW on 40m - my homebrew EL84 rig feeding a straight dipole antenna with telephone drop wire as feeder. Meanwhile the sky became overcast and there was a continuous rumble as I continued to work. All of a sudden I received a jolt through the CW key followed by the crash of a thunderbolt. Ham Radio Websites World.
Ham Radio : Drake TR-4C - receive problem
http://www.nandusthoughts.blogspot.com/2015/03/drake-tr-4c-receive-problem.html
Drake TR-4C - receive problem. The old workhorse seldom gave problems on transmit. A frequent receive problem was the receiver going dead on switching back to receive from transmit. The problem was solved by replacing custom C145 (4 electrolytic capacitors housed in a can) with individual capacitors. Capacitors drying out was the root cause. Ham Radio Websites World.
Ham Radio : Rugged 807 & 1625 tubes
http://www.nandusthoughts.blogspot.com/2015/03/rugged-807-1625-tubes.html
Rugged 807 and 1625 tubes. The good old 807 and 1625 tubes can take a real beating. One night decades ago, when I was working DX on CW with the shack lights off, the room suddenly lit up. The cathode-keyed 807 final was white hot! I let go of the key and cut the power. Since I was monitoring the exciter signal, I was unaware of a break in the drive and had continued to send. After the rig had cooled and the fault rectified, it was back to normal operation again. I still have that tube.
Ham Radio : Miscellany
http://www.nandusthoughts.blogspot.com/p/anecdotes.html
Crystal Radio Circuits - Alternative Concepts. Ideal detector for a Shunt-fed Crystal Radio. Some thoughts on UHF Crystal Radios. Crystal Radio / Piezo Earpiece Interfacing. Handy Crystal Radio Antenna. How I became a ham. Rugged 807 and 1625 tubes. Remembering OM Joe - VU2JA. Remembering radio pioneer J.C.Bose. Some thoughts on shack earthing. Yaesu FT-747GX - PTH problems. Yaesu FT-747GX / FT-757GX - failure to power up. Drake TR-4C - receive problem. Injection moulding machine problem.
Ham Radio : Some thoughts on shack earthing
http://www.nandusthoughts.blogspot.com/2015/03/some-thoughts-on-shack-earthing.html
Some thoughts on shack earthing. The main purpose of mains-supply-earthing (third pin) in the shack is to blow the fuse in the event of a live-chassis fault. Protection against static build-up / lightning strike is another matter altogether. As a SWL in the mid-1970s, the antenna I used with a Philips transistor portable receiver was a long wire at a height of about 50 feet. One summer afternoon, the receiver front end (AF117) blew right after a loud crackle of static. While on the subject of bonding ...
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Ham Radio
Current-operated 'S' Meter for a Crystal Radio. An 'S' meter, for a crystal radio with high-impedance phones, is generally a high-resistance microammeter connected across the phones. In other words, a sensitive voltmeter that does not bypass headphone current significantly. Crystal Radio S-Meter - Schematic. The meter was already mounted on a square bakelite flange. The flange mounting holes served as terminal mounting holes, obviating the need for an enclosure. It was just another day at the plant.
Amateur Radio
A Tuned Passive Radiator. The problem with my Portable AM Crystal Radio. Was that it worked well only at a sweet spot on the shack roof. The presence of the sweet spot was traced to overhead CATV cables acting as passive radiators. Hence it was decided to create a tuned passive radiator to further improve performance. One half of my 40 m inverted 'V' dipole antenna was chosen as the passive radiator. The series-tuned circuit was connected to the core of the coax at the shack end and earthed as shown.
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