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" <[EMAIL PROTECTED]>
To: "Discussion of AM Radio in the Amateur Service"
<[email protected]>
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" <[EMAIL PROTECTED]>
> 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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