[Hallicrafters] LORAN - was: Why I'm a Hallicrafters Guy

[Charlie]

If you're fairly close to a LORAN transmitter site and are using a mixer
input radio with no RF stage, such as an S-38 or S-53A, you'll hear LORAN
intermod on every signal in the HF spectrum!   Put a typical intermod
generator pre-amp such as an Ameco PT-? ahead of just about ANY good radio
and it'll come through loud and clear.  I grew up with it living off the
main runway of Andrews Field ( Andrews AFB as it is known now) .  I used to
think they had an open mike on the B-29's until somebody told me what it
was.

73' Charlie k3ICH

----- Original Message ----- 
From: "Marshall M. Dues" <mmdues at hal-pc.org>
To: "Charlie" <pincon at erols.com>
Cc: <Hallicrafters at mailman.qth.net>
Sent: Tuesday, 03 May 2005 1:26 AM
Subject: Re: [Hallicrafters] LORAN - was: Why I'm a Hallicrafters Guy


> It could not have been LORAN (LOng RAnge Navigation) because it was
> heard on many frequencies in the 3-30 megacycle HF spectrum, and LORAN
> at that time operated in several segments of the 160 meter band only.
> That's why we had power limitations that were different for daytime or
> nighttime, and the power limits were different for different locations
> in the US.  When I moved from Michigan to Houston, Texas in 1969, there
> was an operating LORAN station on Galveston Island on the Texas gulf
> coast.  In later years, the new LORAN-C operated in the VLF spectrum on
> a frequency of exactly 100 Khz.  Microprocessors, memory chips,
> software, and small packaging allowed LORAN Navigator set to be
> practical in small aircraft instrument panel installations.  I put one
> in my homebuilt plane years ago.  They still are being used, but GPS is
> the superior navigation computer system used in aircraft today.
>
> You are right about the sound being like a B-29.  I always imagined I
> was hearing a four engined bomber like a B-17 or B-24 as a child in
> Clio, Michigan, before I became a novice. Short wave listening on the
> family Philco floor radio revealed this phenomena to me in the '50s.
>
> No one has commented on or challenged my diathermy machine theory, yet.
> Does anyone have anything to support that.  I remember Hurley Hospital
> in Flint, Michigan had diathermy machines.  They were RF devices used to
> heat body parts in medical testing.  I doubt the FCC had radiation
> restrictions on that kind of equipment at that time, though.  The
> signals were all over the HF spectrum.  And when people began getting
> TVs in the '50s, you would get herringbone patterns on the picture tube!
> What an aggravation that was!
>
> Regards,
>
> Marshall Dues, WB5MYO
> Katy, Texas (near Houston)
>
>
>
> Charlie wrote:
> > I'm tellen ya, that's LORAN....  Sounds like all four engines on a B-29
> > running ever so slightly out of sync.
> >
> > Charlie k3ICH
> > ----- Original Message ----- 
> > From: "David Hollander" <n7rk at cox.net>
> > To: "Todd, KA1KAQ" <ka1kaq at gmail.com>
> > Cc: <hankarn at pacbell.net>; "Jim Brannigan" <jbrannig at optonline.net>;
> > "Langston, Mike" <MLangston at hcpriceco.com>;
<Hallicrafters at mailman.qth.net>;
> > "Gary Pewitt" <n9zsv at cei.net>
> > Sent: Monday, 02 May 2005 11:55 AM
> > Subject: Re: [Hallicrafters] Why I'm a Hallicrafters Guy
> >
> >
> >
> >>The airplane noise I am referring to was not the woodpecker. I remember
> >>the woodpecker too well tearing up 20 meters while trying to work DX
> >>over the pole in the evenings.
> >>
> >>Would still like to know what it was. It sounded like the continuous
> >>roar of an airplane engine.
> >>
> >>Dave N7RK