I came on loud and clear when i reversed the tickler coil, It has a lot of selectivity, Part 6 will have added circuitry, by part 7 it should have a cabinet and be portable enough to take on camping trips.
40 meter band on home built 1 S14 vacuum tube regenerative receiver. Works 100 times beter than my store bought one! all you need to do is wind the coils for the bands you want.
This is an item I built about seven years ago. It’s a 1934 vintage Twinplex, a regen set from one of Gernsback’s many radio publications. It uses a type 19 tube, and its chassis is a bent piece of sheet metal. I saw a drawing of these sets in a Lindsay Publications advertisement, and I always liked how that tube was mounted sideways on the chassis. Later, Lindsay published a small book on constructing one, and I decided to try my hand at building it. I used as many vintage-looking parts as I …
Part 3 of the item VFO (simple one). The importance of electromagnetic shielding of the VFO (and other radio units) to prevent problems. Especially oscillations and instability, caused by straying electromagnetic waves to locations where they may not be found. Perhaps not so clear: under the plywood plate there is tin-plate glued and nailed. This functionates as “earth/mass” and is connected to the earth/mass/minus/shielding of the radio units above. When you watch this video on another …
The importance of a good quality tuning capacitor for the antenna coil. For VFO and antenna coil an air type tuning capacitor made from aluminium-like or brass-like metal works well. The shaft/knob of the tuning capacitor must be on ground to prevent hand effect when tuning, the turn should be sufficient (360 degrees). Note that less capacitance should occur when you turn the knob to the right, if not the frequency scale will be reversed. Normally the higher frequency is on the right side …
Part 2 of the item “VFO” (simple one). Corrections to the video: “capacity” must be “capacitance”. “Sensive” = “sensitive”. When the frequency of the VFO changes, you have to tune in again to find the radio station, this is what I mean. The item of the hand effect on the front of the VFO is perhaps not so clear. I mean this: the thin copper layer conducts electricity. Although the mass of the receiver is on minus/ground potential, it is possible that your body, touching the receiver by hand …
This is the radio interference from data transmission between 2 Devolo HomePlug powerline adaptors as can be heard on the 25m shortwave band at 11.705 MHz. Starting at around 80 meters from the house walking towards the house where the powerline adaptors are installed (2′nd floor). As you can see the radio interference from these units are severe, and blocks out the broadcast station at a distance of around 30-40 meters from the house. Has EMC reqirements and protection of radio services …
Homebrew shortwave radio operating from 6 to 17 MHz, with productdetector, so suitable for SSB reception (radioamateurs, FAX, RTTY). A classic superheterodyne (single type) radio with an IF of 455 KHz. Schematic in the book “Retro Radio” (Dutch text), ISBN 978-90-5381-234-1. Radio is connected to a 10 meter long wire antenna outside. When you watch this video on another channel/website, please check You Tube for the original content.
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