|[AMRadio] AM Broadcast Quality|
jayw5jay at cox.net
Tue Dec 17 20:04:02 EST 2013
Seems older rigs like the Johnson series seem to get tighter on response as
their components age. I know of a few Rangers I've swept had a hard time
going up to 2KHz much less than 3KHz. Most guys always gave me a good
report and said the bass sounded great, when in reality I had no high end at
73 de jay/w5jay..
From: amradio-bounces at mailman.qth.net
[mailto:amradio-bounces at mailman.qth.net] On Behalf Of Bry Carling
Sent: Tuesday, December 17, 2013 3:06 PM
To: W. Harris
Cc: amradio at mailman.qth.net
Subject: Re: [AMRadio] AM Broadcast Quality
Thank you for the specs. If it won't offend anyone, I would just like to add
that some of this will depend on the characteristics of the microphone too.
You could actually get lower bandwidths but no higher.
Sent with my iPhone 6
> On Dec 17, 2013, at 2:09 PM, "W. Harris" <nbcblue at hotmail.com> wrote:
> The specs on my Ranger audio chain and other Johnson transmitters is flat
response from 250-3000 cycles. For the Collins 32V-3 it is 200-3000 cycles,
which is all very adaquite for good AM good voice communications. I get
very good audio reports on the Ranger. Any more response just ads to the
bandwidth. For AM broadcast stations, 40-7,500 cycles is typical. We are not
> 97.307 Emission standards
> (a) No amateur station transmission shall occupy more bandwidth than
necessary for the information rate and emission type being transmitted, in
accordance with good amateur practice.
> 10 or 20 kHz bandwidth is not necessary for good AM communications on the
ham bands. We are communicating, not broadcasting.
> Bill - K5MIL
>> Message: 2
>> Date: Tue, 17 Dec 2013 05:16:20 -0600
>> From: Rob Atkinson <ranchorobbo at gmail.com>
>> To: "W. Harris" <nbcblue at hotmail.com>
>> Cc: "amradio at mailman.qth.net" <amradio at mailman.qth.net>
>> Subject: Re: [AMRadio] AM Broadcast Quality
>> <CALWD7Z5ODW0AFUed0fheyKQ0-6+TbWmMYqz5N+AmoqZJYzrT+Q at mail.gmail.com>
>> Content-Type: text/plain; charset=ISO-8859-1
>> Let's rewind this whole thing had have a rational discussion with
>> some meaningful technical content instead of all this subjective
>> stuff about "broadcast quality" whatever that means.
>> Bill, since you started it, why don't you start over again and begin
>> with a statement about what you think, i.e. your technical definition
>> of broadcast quality (in other words, audio frequency response by
>> frequency and no. of dB down from the peak level) and what you think
>> it should be, again giving us some numbers. Maybe you think ham AM
>> audio should be 20 dB down at 100 cyles, nothing lower, with a
>> gradual rise of 15 dB to 3 kc and a gradual attenuation to nothing
>> above 4.5 kc. That's an example. You may have a different technical
>> specification, but such a description would actually give us
>> something to discuss in a rational way.
>> The other vague and subjective statement is the "communicate using no
>> more bandwidth than necessary" thing. Why don't you tell us what
>> that means to you in specific terms once again? Otherwise such a
>> comment is needlessly provocative and contentious.
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