|[AMRadio] Anonymous QST Author suggests that Part 97
crawfish at surfmore.net
Fri Apr 18 10:13:11 EDT 2008
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
----- 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
> poor design of the "modern" receiver.
> I'll keep using my good old Collins receivers.....
> 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
>> > "a bit more spectrum" than two SSB signals, based on the notion that
>> > 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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