[SixClub] 6 meters AM

[Donald Dubuque]

It's now official, the new club certificate is ready to distribute.  Details
are located on the website as well as the new look of the certificate.

Six Club <http://www.6mt.com>


Ke4iap


On Thu, Jun 25, 2009 at 1:30 PM, <donroden at hiwaay.net> wrote:

> Some early analog TV transmitters ( AM modulation ) used filters and
> antennas that were frequency shifted to pass USB and attenuate LSB,
> producing a quasi-single sideband signal.
>
> Don WA4NPL
>
>
>
> Quoting "Roger K4RW" <k4rw at lowcountry.com>:
>
> > George,
> >
> > As I'm sure you're aware, this mode has 3 distinct components of the
> signal.
> > Two distinct sidebands of modulation component (USB & LSB), and a carrier
> > are present during transmit. This requires antennas that are capable of
> > radiating each component. The best arrangement is using either a 2
> antenna
> > stack or a 3 antenna stack. The latter is considered the best choice as
> it
> > will equally radiate the two modulation components, each from its own
> > antenna, plus the carrier from its own antenna. The 2 antenna stack works
> > well but you will have some degradation of the signal levels on the two
> > sidebands. This is due to only one antenna of the stack sharing the
> > radiation of 2 sidebands while the other antenna is radiating the
> carrier.
> >
> > If you have a Shure 444 or 450 microphone, place the extendable neck of
> the
> > microphone in the middle of its length of travel. These microphones are
> > designed to be fully extended for USB and fully lowered for LSB. Using
> the
> > middle will allow for the use of both sidebands and provide better audio
> on
> > AM.
> >
> > So there you have it. My secrets are out.
> >
> > All kidding aside, the antennas used for SSB or CW also work quite well
> on
> > AM mode. No special "mode based" antenna is required. However, the
> > polarization does make a difference if you want to talk with someone
> close
> > to you. Then your respective polarization should match for best signal
> > strength.
> >
> > Roger, K4RW
> >
> >
> >
> > -----Original Message-----
> > From: sixclub-bounces at mailman.qth.net
> > [mailto:sixclub-bounces at mailman.qth.net] On Behalf Of George Clark
> > Sent: Sunday, May 24, 2009 11:11 AM
> > To: undisclosed recipients:
> > Subject: [SixClub] 6 meters AM
> >
> >   Those that run AM on 6 meters. What do you use for an antenna?
> > Beam,Dipole? I've never tried it. Those that use dipoles,Could you give
> the
> > measurements for it?
> >                                                    George
> >
> >
> >
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