[Icom] RE TS940 and IC751A

Sun, 5 May 2002 20:11:02 -0500

Adam-

Doesn't an attempt to transmit low frequencies--which don't add to voice
intelligibility--also consume a disproportionate amount of your transmit
power? Bob Heil has very strong feelings on this point I think. The "full,
mellow" AM type sound may be about the least efficient way to communicate
long distances with a minimum amount of power? It would also seem that a
"hi-fi" speaker sensitive at the high end would simply add to hiss and
static, not voice intelligibility. I have a high end sound system for music
but would never consider hooking it to an HF radio.

Andy K5VM

----- Original Message -----
From: "Adam Farson" <[email protected]>
To: <[email protected]>
Sent: Sunday, May 05, 2002 7:41 PM
Subject: RE: [Icom] RE TS940 and IC751A

> Chris,
>
> Not necessarily. The audio-frequency response curve for optimum
articulation
> (intelligibility) at the receiver is typically 350 to 2700 Hz at the -6 dB
> points, with a 2 dB peak at about 1800 Hz. Assuming that the receiver
audio
> response falls within this curve, a high-quality speaker will in all
> probability sound more pleasant than the little internal speaker of the
> radio,  but its capabilities will be wasted to some degree.
>
> If the low-frequency response of the radio extends down to 70 to 100 Hz,
the
> low-frequency components will detract from articulation in some
situations.
> If this occurs, the radio's IF filters and/or PBT can be adjusted to cut
the
> low end.
>
> Probably the best choice of speaker is one designed to match the
> audio--frequency response of the receiver. I have had an Icom SP-20 for
many
> years, and it does a pretty good job in this regard.
>
> Best 73,
> Adam, VA7OJ/AB4OJ
> North Vancouver, BC, Canada
> http://www.qsl.net/ab4oj/
> Note new e-mail address:
> mailto:[email protected]
>
> -----Original Message-----
> From: [email protected] [mailto:[email protected]]On
> Behalf Of Chris BONDE
> Sent: Sunday, May 05, 2002 12:24
> To: [email protected]
> Subject: Re: [Icom] RE TS940 and IC751A
>
>
> I would certainly hazard a guess that a hifi  speaker would enhance a ham
> or communication radio audio.
>
> Chris opr VE7HCB
>
> At 04:20 PM 2002-05-05 +0800, you wrote:
> >   Manybe most of the amateur set +hifi speaker have a very vey good
sound.
> >        73! Xu
> >
>
>
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