[AMRadio] Re: [Boatanchors] AM bandwidth


Jim Wilhite w5jo at brightok.net
Thu Feb 2 19:19:51 EST 2006


My ears may be old, but I can't tell the difference in Class E rigs and 
plate modulated Class C audio.  With that said, I can tell the difference 
about 5-10 Kc away with a properly loaded and modulated Class C rig..

Remember sharp switching of the carrier produces the same problems as old CW 
rigs that were cathode keyed.  The carrier was switched off and on very 
sharply which produced key clicks.

Some of the Class E stuff does the same thing and the result is very broad 
products.  Rapid switching of the carrier produces some of that.  Maybe some 
day someone will develop a method of filtering that will eliminate the 
problem.

73  Jim
W5JO


----- Original Message ----- 
From: "Peter Markavage" <manualman at juno.com>
To: <boatanchors at mailman.qth.net>
Cc: <amradio at mailman.qth.net>
Sent: Thursday, February 02, 2006 2:06 PM
Subject: Re: [Boatanchors] AM bandwidth


> AOR and Ten-tec have already demonstrated on the air that 3 KHz digital
> phone can work and sound very good. AOR claims "as good as FM quality" in
> 1/5 the bandwidth. Technically minded AM'ers should look into this type
> of technology as forward going work within the AM community. Boatanchors
> still could be the "power-driving" force and the reception tool but each
> piece of hardware would require some type of encoder and decoder. If
> AM'ers want to continue to march through the 21st century and keep flying
> the "progressive" banner, this is a great way to do it. I firmly believe
> the FCC will look more fondly at Amateurs who are moving along, and
> keeping abreast, of the latest technologies.
>
> Class E has been around for a number of years. While building a Class E
> rig shows your technical competency at building, if not really advancing
> the state of "AM" or "radio" art.
>
> Pete, wa2cwa
>
> On Thu, 2 Feb 2006 13:24:14 EST StephenTetorka at cs.com writes:
> Has anyone in Boatanchorland documented - by measurement - any of the
> HiFi-like audio stations having bandwidth more than say 6,000 or 9,000
> wide?
>
> Also...how many of these HiFi stations are there?..are these the E-class
> rigs?
>> Lastly, what other pursuits can these technically inclined AM Hams
>> subscribe
>> to in expressing their energies within our hobby?
>>
>> R,
>> Steve
>> WA2TAK





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