BLIND-HAMS Archives

For blind ham radio operators

BLIND-HAMS@LISTSERV.ICORS.ORG

Options: Use Forum View

Use Monospaced Font
Show Text Part by Default
Show All Mail Headers

Message: [<< First] [< Prev] [Next >] [Last >>]
Topic: [<< First] [< Prev] [Next >] [Last >>]
Author: [<< First] [< Prev] [Next >] [Last >>]

Print Reply
Subject:
From:
"Martin G. McCormick" <[log in to unmask]>
Reply To:
For blind ham radio operators <[log in to unmask]>
Date:
Wed, 30 Jan 2013 21:11:47 -0600
Content-Type:
text/plain
Parts/Attachments:
text/plain (66 lines)
Extreme thanks.

	The URL actually wrapped twice but no problem. I did get
the file and just got through listening to it.

	Imagine what that FM band was like during even a
moderate Sporadic E opening or even the occasional F2 event. I
believe that was one of the reasons why the FM broadcast band
was moved up to 88-108 MHZ after World War II.

	In those days, it was very hard to come up with
affordable receivers that had good performance much above 50
MHZ. Don't get me wrong. There were receivers and transmitters
that went well in to UHF, but they were expensive and physically
large and heavy.

	That is one of the reasons why we hams lost eleven
meters to the CB service in 1958 or so. It was a grand
compromise between equipment that people could afford which also
actually still worked.

	A long-since departed ham in our area once told me of a
CB service around 460 MHZ. The receivers were super regenerative
and the transmitters pumped out around a watt or so.

	They would have been little more than toys and rather
expensive ones at that.

	The FM band we hear in this recording was around 42 to
48 MHZ and those frequencies were prime real estate in the years
after World War II.

	There was FM radio, public safety and commercial two-way
and TV all fighting tooth and nail for the same range of
frequencies.

	That, by the way is what happened to Channel 1. It
actually shared some frequency space with the FM broadcast band.
When propagation was normal, that worked more or less, but when
we had skip, video buzz from distant TV transmitters mixed with
FM radio and nobody was happy.

	The TV broadcastors gave up Channel 1 which was limited
to low-power TV, anyway, in order to be given channels which were
higher in frequency but had less desireable coverage due to the
limitations of the tube-type tuners of the day.

	The original TV allocation after 1945 called for 19
channels but the air force wanted and still uses frequencies
between 230 and 400 MHZ so that's why the VHF channels stopped
at 13.

	It's too bad that Armstrong committed suicide in 1954 as
he would have seen much of what he wanted come to pass had he
lived longer.

Martin WB5AGZ

Ron Canazzi writes:
> Try this direct link using your Lynx browser in Linux.  I tried it and it 
> is
> currently downloading as a test.  I see no reason why it should not work.
> Be sure to copy the whole link--since it might line wrap and you may get 
> an
> error 404 because the link you paste is not complete.

ATOM RSS1 RSS2