Quack Says
The real problem is in the RX however a big one is also in the headset that
NO ONE """ NO ONE """ is supplying as an acceptiable communication
headset. One that is designed for communication and fits properly over the
ears so it can be worn for extended periods. The closest I have come to
one is the headset that is issued and used on military aircraft in the 60's
70's and 80's and maybe even today. The only problem is that the microphone
is not compatable with Contest SSB processing. I use my headset and never
have that blast that can come with most Stero Type of headset's that are
avaliable when that strong local calls and your straining to hear a weak
one. I'm sure something could be done inline with some limiting ckt and
limiting of audio to communication range but I'm not the designer, and
getting almost to the too old to be compediton in contesting.
Rex aka: Quack
----- Original Message -----
From: "David Hachadorian" <k6ll@adelphia.net>
To: "cq-contest reflector" <cq-contest@contesting.com>
Sent: Tuesday, July 25, 2006 10:13 PM
Subject: Re: [CQ-Contest] hiss
>
> ----- Original Message -----
> From: <k8bb@comcast.net>
> To: <CQ-Contest@contesting.com>
> Sent: Tuesday, July 25, 2006 1:23 PM
> Subject: [CQ-Contest] hiss
>
>
>>I notice that most amateur transceivers, even most (all?)
>>high-end units,
>> have quite "hissy" audio amplification. I find this
>> particularly irritating
>> but I have ignored it or otherwise dealt with it until it
>> doesn't bother me
>> anymore. However, I have *excellent* hearing and I would
>> like to keep it
>> that way - pumping high-freqency, white-noise hiss (even
>> very low level)
>> through my headset until I become desensitized to it is
>> not looking out for
>> a healthy future. :-)
>>
>> Anybody use an audio filter to get rid of your rig's audio
>> amplifier noise?
>> I have a Heathkit HD-1418 audio filter on one of my radios
>> which is a most
>> excellent variable audio filter, but the audio amplifier
>> in it is not much
>> cleaner than my rig. I have also seen the SCAF-1 by Idiom
>> Press that is
>> intended to help low-level filter blow-by (etc.) but
>> supposedly also helps
>> fix "white noise" hiss and stuff. Anybody use one? Does it
>> work for this
>> purpose?
>>
>> Can anybody offer an alternative solution for somebody who
>> still has
>> very-wide-frequency hearing? I am not really looking for a
>> "ham radio audio
>> filter" as much as I am looking to improve the
>> poor-quality audio coming
>> from the audio amplification stage of my receivers.
>>
>> Thanks!
>> Don Chisholm K8BB
>> Pontiac, MI
>
> Many rigs have a line level audio output, picked off before
> the final audio amp, for use with phone patches or rtty
> decoders. You can run that to the LINE IN jack of a
> soundcard and listen to the audio output of the sound card
> on headphones or amplified speakers, which are usually
> pretty good audio amps.
>
> Also, sometimes the hiss coming out of the radio's audio amp
> is constant, and does not vary with the position of the
> audio gain control. In that case you can add attenuation
> before the headphones (~120 ohm resistor), and improve the
> s/n ratio at normal listening volume.
>
> Dave Hachadorian, K6LL
> Yuma, AZ
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> _______________________________________________
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>
>
> --
> No virus found in this incoming message.
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> Version: 7.1.394 / Virus Database: 268.10.4/396 - Release Date: 7/24/2006
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>
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