I agree with Jay. No one has given us reason to hurry on this, at least not yet. Let's fully understand what we want to do, the ramifications of those wants, and then get it right the first time. January is early enough. And if we don't have a good concensus in January, then delay it even more. 73. Jim, W6CF John Bellows wrote:

I have full confidence in the ability of Chris and Paul to craft an appropriate petition on this question. With each posting on this topic it is becoming more apparent that the allocation by bandwidth resolution has ramifications far beyond those discussed in July. More specifically there appear to be a variety of opinions as to what the petition is intended to accomplish and the specifics of what is to be included in the request to FCC. Without that information Chris and Paul are left to interpret what was intended.

Rather than risk an unfortunate encounter with the Law of Unintended Consequences we may prefer to wait until January to clarify what we intended to request and how to do that as narrowly as possible. The other option is to proceed, in which case the only Board wide guidance that Chris and Paul have is the language of the motion rather than our individual opinions of what was intended.

Jay KØQB

Dave:

6kHz is not okay for SSTV as it is image. Therefore, bandwidth is limited to a max of 3Khz.

Dennis

-----Original Message----- From: Sumner, Dave, K1ZZ [ mailto:dsumner@arrl.org] Sent: Wednesday, August 28, 2002 2:55 PM To: arrl-odv Subject: [ARRL-ODV:7726] Re: ARRL & Bandwidth

Art Goddard suggested I share with you the following exchange that he and I had a few months ago.

Dave K1ZZ

-----Original Message-----

From: Art Goddard [ mailto:w6xd@attbi.com]

Sent: Thursday, May 02, 2002 3:01 PM

To: David Sumner K1ZZ

Cc: Jim Haynie W5JBP

Subject: Is there a Limit?

Hi Dave-

At Visalia, a couple of members expressed concern to me about the SSB

"Hi-Fi" operation on 14.178, and other frequencies. According to these

members, the Hi-Fi proponents have modified their radios for up to 6KHz of

audio bandwidth and are unnecessarily disrupting nearby operators.

97.307(a) says use no more bandwidth than necessary. ITT's Reference Data

for Radio Engineers states that 3KHz is the necessary audio bandwidth for

communications-quality radiotelephone and 4-10KHz for sound broadcasting,

"depending on the quality desired". Since broadcasting is prohibited

(97.113) what is the justification for broadcast audio in the Amateur Radio

Service?

Is there any limit? Is SSB with 6KHz bandwidth (J6E) OK? The ARRL FCC Rule

Book, 12th ed., p 4-27, appears to side with the HI-Fi folks, bounded only

by "good amateur practice". If J6E is OK for SSB radiotelephone, then 6KHz

is OK for SSTV and any other non-phone emission (97.307(f)(2)). And if 6KHz

is OK for SSB, then 12 KHz is OK for AM.

May QST, p13, carries an ad for Ten-Tec's Jupiter radio heralding "Great

Audio!" with built-in DSP selection of transmitted audio up to 3.9KHz to

"deliver the finest sounding audio in amateur radio". By carrying this ad,

we have aligned ourselves with the Hi-Fi proponents, at least in some

people's eyes.

"It Seems to Us" there's an opportunity for ARRL to provide some guidance

here...

73, Art

-----Original Message-----

From: Sumner, Dave, K1ZZ

Sent: Friday, May 03, 2002 4:11 PM

To: 'Art Goddard'

Cc: Jim Haynie W5JBP

Subject: RE: Is there a Limit?

Hi Art,

Occupied bandwidth is defined as 26 dB down from mean power. The bandwidth of a voice signal is heavily dependent upon the individual voice characteristics. Even if a transmitter is deliberately designed to pass voice frequencies above 3 kHz, it will be a rare voice that contains much energy at those frequencies.

Looking at it another way, is there an affirmative obligation on an amateur to filter out of his or her transmitted voice signal, frequency components that are present in his or her voice? I don't believe there is.

Poor IMD characteristics and excessive power are more likely to cause problems than broad transmitter filters, it seems to me. But I admit that I seldom listen with a filter wider than 500 Hz.

73,

Dave K1ZZ