Re: Fw: Re: My K3's hissy and noisy audio

[Eric Scace K3NA]

No.  It's 3 resistors in a T or pi attenuator circuit.  There are many
attenuator calculators on the web (just Google) to help select the
appropriate resistors for your headphone impedance and desired amount of
attenuation.  One attenuator is needed for each ear.

on 2009-04-05 22:14 Billy Cox said the following:

> Eric, is this a simple resistor or ?
>
> BTW, TU for the NCJ articles on TX/RX.
>
> 73 de Billy, AA4NU
>
> -----Forwarded Message-----
>  
>> From: Eric Scace K3NA <[hidden email]>
>> Sent: Apr 5, 2009 9:21 PM
>> To: Maarten van Rossum <[hidden email]>
>> Cc: Elecraft Group <[hidden email]>
>> Subject: Re: [Elecraft] My K3's hissy and noisy audio
>>
>> I have very sensitive in-ear monitors.  The K3 (and the Orion, and
>> possibly other radios) has significant hiss.  I inserted an attenuator
>> and knocked the hiss down below my ability to detect it.  There is
>> plenty of audio range remaining.
>>
>> You may find 10 to 20 dB will help.
>>    
>

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[Steve Ellington]

This little gadget from Radio Shack will act as an attenuator. I use it on
my IC-7000. You can adjust it for no hiss then crank up the AF gain for
normal listening.
http://www.radioshack.com/product/index.jsp?productId=2102975
I use Bose Tripod headphones on the K3 and there is no audio hiss
whatsoever. I think what some of you refer to as hiss is either atmospheric
noise or noise generated ahead of the audio stage. If I turn down the RF
gain, there is no noise at all. The IC-7000 has a bit of audio hiss. Turning
down the RFG or even the AF gain has no effect. This is where the RS device
comes in handy.
The worst hisser I ever had was an FT-1000MP but that was generated in the
IF stage. Yaesu still has hissy radios.

Steve Ellington
[hidden email]
----- Original Message -----
From: "Eric Scace K3NA" <[hidden email]>
To: "Billy Cox" <[hidden email]>; "Elecraft mailing list"
<[hidden email]>
Sent: Monday, April 06, 2009 1:00 PM
Subject: Re: [Elecraft] Fw: Re: My K3's hissy and noisy audio

> No.  It's 3 resistors in a T or pi attenuator circuit.  There are many
> attenuator calculators on the web (just Google) to help select the
> appropriate resistors for your headphone impedance and desired amount of
> attenuation.  One attenuator is needed for each ear.
>
> on 2009-04-05 22:14 Billy Cox said the following:
>> Eric, is this a simple resistor or ?
>>
>> BTW, TU for the NCJ articles on TX/RX.
>>
>> 73 de Billy, AA4NU
>>
>> -----Forwarded Message-----
>>
>>> From: Eric Scace K3NA <[hidden email]>
>>> Sent: Apr 5, 2009 9:21 PM
>>> To: Maarten van Rossum <[hidden email]>
>>> Cc: Elecraft Group <[hidden email]>
>>> Subject: Re: [Elecraft] My K3's hissy and noisy audio
>>>
>>> I have very sensitive in-ear monitors.  The K3 (and the Orion, and
>>> possibly other radios) has significant hiss.  I inserted an attenuator
>>> and knocked the hiss down below my ability to detect it.  There is
>>> plenty of audio range remaining.
>>>
>>> You may find 10 to 20 dB will help.
>>>
>>
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> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html 

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