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w3hwj
Nov 09, 2023
In The Radio Shack
Has anyone built this kit from Amazon? https://www.amazon.com/Receiver-Wireless-87-108MHz-4-75-21-85MHz-Display/dp/B09P8F6615(https://www.amazon.com/Receiver-Wireless-87-108MHz-4-75-21-85MHz-Display/dp/B09P8F6615) The AM function is set up for 9 KHz station spacing; we use 10 KHz in USA. On shortwave, I wonder what the tuning increment might be? I could add a BFO to receive Morse or SSB, but if the smallest tuning increment is 1 KHz, it would be difficult to "clarify" SSB. Rich
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w3hwj
Mar 22, 2023
In Tube Radios
I was looking for the mounting template drawing for a National type N vernier dial. A nice gent on ARF guided me to this site. The 1935 Radio book is a great collection of goodies including drawings for National dials, variable caps, and plug-in coils. http://vtenn.com/Blog/?p=492 Rich
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w3hwj
Jul 18, 2022
In Forum Issues & Administration
Is there a simple way to edit a post? I just made a spelling mistake and want to correct it? Rich
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w3hwj
Jul 18, 2022
In Other Electronic Projects
Recently bought a small Tesla Coil kit via Amazon. Less than US$10. It is a simple one transistor flyback circuit (self-driven). It has a power FET if one wants to modulate the Tesla "arc" with audio. I haven't tried that. The "arc" is pretty anemic with 18 V of Vcc. (I am using a power tool 18 V lithium battery pack, as I am concerned that the RF might damage my bench power supply.) I can light a CFL lamp from about 6 inches away. Will try to take a photo soon. Next experiment is to take the coil (350 turns) from another Tesla kit and glue it to the original coil, connecting in series. I will put some RTV over the junction to prevent corona. This may overload the switching transistor, but I will give it a try. The primary is only one turn, so I will try for a 700 : 1 step-up ratio. Rich
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w3hwj
Jul 02, 2022
In Welcome to the Forum
Nice to see TRB back on-line and hope the new version will be as informative and helpful as the old TRB. Rich
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