Archive for the ‘Radio, Television entertainment’ Category:

2018-06-24 Antennas Loopstick Vs Spider Web

From FB group Building Transistor Radios Jim Glover You asked about performance. There are factors unrelated to either type that affect the performance, one being the type of wire used. If Litz wire is used it has lower losses, and therefore higher Q than solid wire. Same holds true for silver plated wire at HFs.

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2018-05-13 My First Transistor Radio

From FB group Vintage Transistor Radios OMG, that was so long ago, I could never sort out which one. See, I was born with a soldering iron in my hand, and I fixed so many radios, I could never remember which one was one that I had. Most of the electronics I was given were

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2018-04-22 Ferrite Loopstick Basics

From FB group Building Transistor Radios Then there is the loopstick. It is deliberately made long and thin to capture the RF magnetic fields. The frequencies that loopsticks are better at capturing are those that require long antennas that would be impractical. So the AM broadcast band is where loopsticks do their best. The loopstick’s

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2018-03-28 Wideband RF Amp In Royal 500s

From FB group Ferrite Loopstick Antenna Experimenters Some experimenters in another group looked at schematics and saw that some radios with a RF amplifier between the loopstick and the converter used a third section on the variable capacitor to tune the RF amplifier. This is good, but it makes the variable capacitor more expensive and

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2018-03-27

From FB group Vintage Transistor Radios James Ault Thanks for reminding me. I gave my 22 yr old car to my sister and after awhile the door started rattling. I found that the post that sticks out for the door’s latch to latch onto used to have a nylon sleeve, but age had caused it

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2018-03-02 One Transistor AM Radio

FB group Building Transistor Radios In JF1OZL’s voluminous archive I found his version of a MW receiver.  It is labeled [2] …. MW-RADIO (see link).  He used a long wire antenna, and an IF transformer with the ceramic capacitor removed for the tuning coil.  He also said to use a ferrite loopstick, which is what

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2018-01-08 RF Oscillator For AM Band

For FB group Building Transistor Radios When I started building regen receivers, the first thing I found I needed was a simple  signal generator.  I have a function generator, but every time I want a different frequency, I had to readjust the controls.  So I built a few RF oscillators to put close to the

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2017-12-30 Zenith Royal 755LK

I tried to to post this to the FB group Vintage Transistor Radios, but the FB app crashed and I lost several lines of my typing.  Makes me angry! The radio was not making any sound.  I removed the chassis from the case.  I found the ‘battery saver’ slide switch had been forced apart.  I

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2017-12-29 Shipping Costs Kill Good Deals

From FB group Vintage Transistor Radios My comment about a radio for AU$5400 on eBay. Dreaming, or more like wishing and hoping for a sucker to buy it.  But at least he had enough sense to add ‘or best offer’.  If someone offers a hundred, maybe he’ll take it. I’ve had a few successes with

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2017-12-16 Olympic 860 Radio Capacitor Replacement 

I was the only bidder on a lot of three radios, one of them is an Olympic model 860 AM transistor radio.  This radio uses four AA cells for a total of 6 volts DC. Overall the radio is in good condition – no chips or cracks.  I powered it up and if I turned

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