|[AMRadio] AM frequencies|
Rev. Don Sanders
innatehealing at bigplanet.com
Tue May 3 18:36:57 EDT 2005
Bob, a smallloop for 75 meters would be 60 feet in circumference, use a 50
to 80 PF capacitor to tune it with 3000 volt airgap for up to 100 watts. You
will also need a remote drive motor as the bandwidth is about 12 Khz. If
you can get to your roof, you would be better to run a loop around the
outside of building as a full wave loop on 80 meters, 274 feet of wire and
feed with ladder line for all band use.It would be hard to see and the
ladderline would run tight against the building down to your apartment.
Otherwise, an endfed wire from your apartment up over the roof to the farr
siude would work with a 1/4 wave counterpoise on 80,40 ,20 etc runing around
the edge of the room and tied to copper cold water pipe if possible.
Several years ago I installed a loop on the room of a condo and ran the 450
ladder line down through the plastic vent pipe to the bathroom. We cut a
hole in the vent pipe in the bathroom to enter the ladder line then ran it
to the rig in the bedroom.Worked very well. We were lucky that the vent pipt
was accessable through a small hole, about 4 inches diameter, in the wall
over which we hung a picture.
Healthfully yours, Don W4BWS
----- Original Message -----
From: "Bob Macklin" <macklinbob at msn.com>
To: "Discussion of AM Radio" <amradio at mailman.qth.net>
Sent: Tuesday, May 03, 2005 4:30 PM
Subject: Re: [AMRadio] AM frequencies
> About HF loops?
> I live in a senior apartment and I can't have an outdoor antenna.
> The ARRL Stealth Radio Book mentions loops but does not give much
> on them.
> I live on the fouth floor(in the PENTHOUSE) and I have a 4' by 6'
> window. I have been thinking about making a 75M loop that would fit in the
> window. But none of the infomation I have been able to find tells me how
> make a tuner for it.
> Bob Macklin
> Seattle, Wa.
> "REAL RADIOS GLOW IN THE DARK"
> ----- Original Message -----
> From: "John Lawson" <jpl15 at panix.com>
> To: "Discussion of AM Radio" <amradio at mailman.qth.net>
> Sent: Tuesday, May 03, 2005 2:17 PM
> Subject: RE: [AMRadio] AM frequencies
> > On Tue, 3 May 2005, Grant Youngman wrote:
> > >
> > >
> > > You'll also find activity around 3825 from time to time, and anywhere
> > > between 3870-3890 or so, depending on whether or not the "owners" are
> > > around. Apparently there are a small number of "exceptionally
> > > amateurs to whom the FCC has sold dedicated, sole-use frequencies,
> > > MUST NOT USE even if the frequencies are clear. Many frequencies in
> > > band especially seem to fall into this category :-)
> > <soap_box_rant = on>
> > And it's about time that shit came to a screeching halt, IMHO - it's bad
> > enough all the harrasment from the sideband-only clowns, but this
> > formal, ritualized "modulation bigotry" is just making the SSBer's point
> > for them. I think the answer is to be very polite, courteous, and
> > respectful, and also to run about 530.25 RMS watts into the antennae
> > clean, spur-free compandored 100% modulation - adhering all the while to
> > the Commission's Rules and to the Gentlemen's Agreement Bandplan(s).
> > And let 'em rant and rave all they want. That's what my Valiant, amp,
> > and R-390 will be doing, as soon as I get the HF loop working again -
> > soon!
> > </soap>
> > Cheers
> > John KB6SCO
> > Carson City
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