Page 26 May June 2014 TCA

QUA – A TOPICAL DIGEST

Wayne Green was a quirky character with a RQ – request for repeat. This was (much) later
somewhat infated ego, and did not hesitate to extended to ARQ for Automatic RQ as used by
print articles of dubious technical validity, but TOR (Teleprinter over Radio) systems, and is now
every issue had lots of interesting stuff, and the generic for just about any error correcting system.
mass of material in the archives is well worth an
extended look. “73” is part of our history for sure. CQ – message to all stations. So not quite the
same meaning as our CQ but very similar.”
The NSARC newsletter said: SINGLE-SIGNAL CW FILTER
Bob Eldridge, VE7BS
920 Erickson Road “Nostalgia Corner: 73 Magazine (also known as Relating to the discussion about the single-signal
RR2 Pemberton, BC 73 Amateur Radio Today) (OCLC 22239204) was
V0N 2L2 flter in the HRO, here is the response of the
E: ve7bs@rac.ca a United States-based Amateur Radio magazine similar flter described by Jim Lamb in his August
that was published from 1960 to 2003. It was 1932 QST article “Short-Wave Receiver Selectivity
INNOVATIVE USE OF known for its strong emphasis on technical to Match Present Conditions”:
MORSE CODE articles and for the lengthy editorials in each
issue by its founder and publisher,
The transcript of Terry Wayne Green. Archives can be found at
O’Reilly’s “Under The http://archive.org/search.
Infuence” program on CBC php?query=collection%3A73-
Radio1 can be found at: magazine&sort=-publicdate&page=1.”
http://www.cbc.ca/
undertheinfuence/ NSARC also noted that the fattest knight at
season-2/2013/01/26/ King Arthur’s Round Table was Sir
radio-is-dead-long-live- Cumference. He acquired his size from too
radio-1/ much pi. Sorry, that piece of circular trivia
snuck in there – all I intended to add was
At least it was there when I that the ARRL have produced a 30-minute
wrote this column but who video that traces the evolution of Amateur
knows whether you can Radio. It is well worth a look: http://www.
still fnd it. southgatearc.org/news/2014/february/a_
Among several examples of century_of_ham_radio_video.htm
the innovative use of radio There is also another link to ARRL’s history
broadcasting, it included a at: http://www.eham.net/articles/31685
description of the way a
message was sent to USE OF _ . _ . _
kidnapped soldiers in My notes about Morse Code prosigns and
Colombia by embedding, my memories of the use of _ . _ . _ in the
in a music program, RAF, brought reams of information from
a Morse Code message Rob, VA3ROM. He sent me the text of
“19 people rescued, you’re Article 25 of the ITU London Conference
next, don’t lose hope” 1912, which included the stipulation that
(I doubt the punctuation _ . _ . _ had to be sent as an alert that
symbols were actually sent). someone (or anyone, or everyone) was
73 MAGAZINE ARCHIVE about to be called. We were in the midst of an “Actual audio response curve of the receiver for a
exchange of emails relating to the history of
This being the 100th year development of the code for maritime 100-cycle beat note. This represents the
of the American Radio radiotelegraph operation when the reminder cumulative selectivity of all the tuned circuits,
Relay League (ARRL), I have came from the editor that our columns for this including the i.f. flter in the ‘Series’ connection
been wallowing in history issue were due. Rob, being an ex Radio Offcer, and two tuned-primary tuned-secondary i.f.
(not that unusual for me) has lots of information from personal experience transformers. No audio-frequency fltering was
and I noticed in “Contact” and from his collection of documentation used in running the curve. The crystal (and i.f.
– the newsletter of the references. I haven’t got far past frst base in amplifer) resonance frequency is 528 kc. Even
North Shore Amateur sorting it out, so undoubtedly there will be with this order of selectivity high-speed keying is
Radio Club in North more to say later on the introduction of CQ etc reproduced cleanly. Still higher selectivity can be
Vancouver – this reminder and the dropping of QST. obtained but puts tails on the signals.”
that you can still fnd on CIRCUIT SIMULATION AND ANALYSIS
the web the text of issues Meanwhile, VE3ZI also responded to this item:
of “73” of 50 years ago. The book, Circuit Simulation and Analysis (ARRL
“I recall BQ – a short message between two 2013), by Dr Saeid Moslehpour provides an
stations. This was used for informal minor introduction to computer-aided circuit design
messages – an important message would use a using PSpice software.
service telegram.
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