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Re: [Phys-L] Ham radio. was: Re: (no subject)

Interesting. Technology has changed/improved/downsized over the years. I
remember going to a star party around 1982/83 in Chicago. A guy there
showed me and my dad the first portable phone. The thing was large with an
antenna, and had a larger battery connected by a cord. The guy thought it
was cool! My dad and I thought to ourselves that this is crazy. Who would
use a bulky portable phone? And now most of society can't live without
their smartphones!

On Sun, Mar 22, 2020 at 3:41 PM bernard cleyet via Phys-l <> wrote:

I was a bit later, probably 16. (ca. 1953) I wasn’t interested in
talking, just be legal in experimenting. However, I managed to voice
communicate via. the 420-450 MHz ham band from San Marcos Pass to a friend
in down town Santa Barbara, about nine miles, AARL field day. [1} I
discovered later the APS-13 IFF unit in a San Francisco surplus store.
While a Sophomore at UCSB, one of the profs. was setting up a large scale
cosmic ray shower detector. He was going to use co-ax. cable. I suggested
radio using the APS-13, which already had a blocking osc. pulse generator,
transmitter and receiver. The detector had about five Cherenkov detectors
paired 5” MPTs in coincidence looking at water in heavy Al army stock pans
(10 gal?); diameter of detector circle about a half mile? This was for
the International Geophysical Year (1957/58). My intro. to radio while in
HS was a 6J6 oscillator. (These were the transmitter, a pair, in the
APS-13). I managed to “get it up” to 800 MHz measured w/ lecher wires.
Resonance length detected with a torch bulb in a wire loop. I drove the
tube hard, cooled in a cup of water, intermittent use, of course.

bc waxing nostalgic.

[1] I still have the transmitter and receiver and one APS-13. The plate
diss. is ~ 30 W. This is laughable now, wherein all in a tiny IC! And
much higher frequencies. My friend at the Exploratorium is experimenting
with the mm wave radar IC used in ’bile's vehicle proximity sensor. (Our
Prius’ most useful feature!)

On 2020/Mar/22, at 01:29, Bob Sciamanda via Phys-l <> wrote:

When I was a boy of 14 I was a Ham Radio Operator. We built radio
transmitters and chatted with others world wide.
Now modern technology lets EVERYONE do this via the internet using
facebook, etc and cell phones. We used both Phone and Morse Code. Now it
Voice and Texting!

Bob Sciamanda
Physics, Edinboro Univ of PA (em)
Forum for Physics Educators

Forum for Physics Educators



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