[AMRadio] Anonymous QST Author suggests that Part


W6OM w6om at cox.net
Fri Apr 18 10:22:30 EDT 2008


A standard practice in any business, school, government or relationship is
to never respond to anonymous comments.  Once you do they have control of
you and you will never know where it is coming from, regardless of the
topic.  Anyone of integrity, character and courage will sign their name to
such comments, others wise its invalid input and just meant to stir a quiet
pot.....

All the Best

Ron Weaver   W6OM

www.qsl.net/w6om




-----Original Message-----
From: amradio-bounces at mailman.qth.net
[mailto:amradio-bounces at mailman.qth.net] On Behalf Of Joe Crawford
Sent: Friday, April 18, 2008 7:13 AM
To: Discussion of AM Radio in the Amateur Service
Subject: Re: [AMRadio] Anonymous QST Author suggests that Part 97
requires6kHzAM Bandwidth Limit 

Don K4KYV hasn't been back on the forum, so I will say that he has a 3400 Hz

filter in his audio chain that has a sharp cutoff right at 3400. He bought 
it from a surplus dealer in D.C. in the '70's for $5.00 or so. He commented 
on here that he wish he has bought all the guy had, because they are 
unobtainable now.
                                            Joe W4AAB
----- Original Message ----- 
From: "WB3AWJ" <wb3awj at comcast.net>
To: "Discussion of AM Radio in the Amateur Service" 
<amradio at mailman.qth.net>
Sent: Friday, April 18, 2008 7:06 AM
Subject: Re: [AMRadio] Anonymous QST Author suggests that Part 97 
requires6kHzAM Bandwidth Limit


>I wonder if the writer of the original considered this "usual approach" of
> 300-2.7 Kc  most likely came about from the practice of using the same
> filter to select the sideband in the exciter and defining the IF bandwidth
> of the receiver.
>
> Rather than on any real spectrum efficiency considerations.
>
> As the the 30 Kc wide AM signals.... probably another case of the 
> relatively
> poor design of the "modern" receiver.
> I'll keep using my good old Collins receivers.....
>
>
> WB3AWJ
> Robert A. Poff
> Loganville, PA.
>
> S/V Loon
> 1983 Hunter 34
> Havre de Grace, MD
>
> "Lieutenant, target the offending power boat and launch photon torpedoes"
>
> ----- Original Message ----- 
> From: "rev. don" <w4bws at comcast.net>
>> > high frequency hearing".  He goes on to allege that an AM signal
> occupies
>> > "a bit more spectrum" than two SSB signals, based on the notion that
> there
>> > is no need to transmit audio frequency components of the voice that 
>> > fall
>> > below 300 Hz, and that the "usual approach" with SSB is to transmit
>> > frequencies from 300 to 2700 Hz.
>
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