A Nice Hallicrafters S38-E Knack Story


Bill –

It was Christmas of 1958 (5th Grade)that my parents bought me the Hallicrafters S38-E that I still have. I was recovering from multiple surgeries the previous summer to correct for the effects of Polio when I was 3. I came down with Polio in the last year before the vaccine was released to the public.

A bit of bio – because of my physical limitations as a child, I spent a lot of time indoors reading and listening to the radio. Broadcast AM here at that time was still playing dramas like “The Lone Ranger” and “Big John and Little Sparky”. I really enjoyed them. Then, on that fateful day I asked my mother why, since our radio plugged into the wall electric outlet and we could hear people talking, weren’t other people able to hear us talking on their radio if we spoke into the loudspeaker. She said, ‘I don’t know, but the library ( 2 blocks away) will have books about radio that you can read.” The Knack bit early and it bit hard.

By the time I was in 5th grade I had discovered short wave radio. I dearly wanted a short wave radio and I wanted a Hallicrafters. Somewhere I had found a catalog and wow! nothing else would do. What I didn’t realize until I was in my teens was just how hard times were for my folks. Most families then did not have medical and hospitalization insurance. My dad was paying off the hospital and the doctors every month almost until I graduated from high school.

But, anyway, I did get the S38-E for Christmas. At $69.95, it was the least expensive Hallicrafters available. In reality, it is just an All-American – 5 with extended tuning range. Tuning was as broad as a barn door, and above 15 MHz it is as deaf as a post. But it was mine and I loved it. The short wave bands were still hot in those days as we were just peaking through one of the most celebrated Solar Maxima of the last century. Many the hours I listened to HCJB – Quito, and Radio Moscow, and Voice of America…. I also found people talking to each other – Wow! Ham Radio. And just look at me now…. And those strange beeping sounds – that was actually people talking? And what was that strange Donald-Duck s
ounding talk all about?

Yes – I still have that same S38-E. It went to college with me, and has been with me for over half a Century, now. Yes, it still works. (Needs a replacement IF transformer), Yes, it will shock the bejeebers out of you if you plug it in wrong. {I use two filament transformers back-to-back to prevent that.) Yes, the Knack still has me, but that’s another chapter.

72’s
Bruce KK0S

Our book: “SolderSmoke — Global Adventures in Wireless Electronics” http://soldersmoke.com/book.htm Our coffee mugs, T-Shirts, bumper stickers: http://www.cafepress.com/SolderSmoke Our Book Store: http://astore.amazon.com/contracross-20

High Pitched Audio QRM in SS #148

Two listeners blessed with good high frequency hearing alerted me to the fact that the latest podcast had some annoying high pitched noise in the background. Peter, VK2TPM was the first to report it — he sent along the above spectral analysis of a gap between words. Steve, W1KF, also heard it, and provided a clue that I think solved the mystery.

Steve noted that the noise was not present during the sponsor ads that were included in this episode.
That let me figure it out. On Saturday when I was recording this, I got through about half the show when the power went out (that happens a lot here). The battery in the laptop I was using to record the podcast saved the day and no data was lost. The power came back on within a few minutes, but the outage had turned off the main PC in the shack. That PC (AND ITS FAN) remained off when I was recording the ads. I did the same kind of noise removal processing that I always do, but this time the noise sample that I used was taken from the mic with the main PC (AND ITS FAN) turned off. My guess is that the whine from the fan (which I can’t hear due to tinnitus) didn’t make it into the noise sample, and thus didn’t get removed from the podcast audio. I went back and did a couple of rounds of noise removal and low pass filtering. I think (I HOPE) I got rid of the offending noise.
I have uploaded a new and hopefully improved version of the podcasts. Audio reports will be appreciated.

One of my New Years resolutions is to improve the technical and substantive quality of the podcast.

Thanks Peter, Thanks Steve.

Happy New Year to all!

Our book: “SolderSmoke — Global Adventures in Wireless Electronics” http://soldersmoke.com/book.htm Our coffee mugs, T-Shirts, bumper stickers: http://www.cafepress.com/SolderSmoke Our Book Store: http://astore.amazon.com/contracross-20