Re: K3 in a cw pileup - needs work

Posted by W6ODJ on Feb 08, 2010; 11:56pm
URL: http://elecraft.85.s1.nabble.com/K3-in-a-cw-pileup-needs-work-tp4523884p4537965.html

I hope people do not make the mistake of using in-the-ear earbuds with ham radios, even the K3.  These in-the-ear phones like the etymotic or the shure have to be put pretty deep into the ear canal to seal and provide isolation.  They are wonderful for hi-fi.  I use a pair by Shure to listen to Brahms on airplanes.  BUT, they take at least a few seconds to extract from your ears.  If, as has been reported on this reflector several times, the radio mis-functions and puts out a very loud audio signal, your ears will be fried before you can react.  

DON'T DO IT!!!!

Oliver
W6ODJ


On 7 Feb 2010, at 3:21 AM, Bill W4ZV wrote:

>
> "High isolation headphones" below means ~30 dB isolation from ambient noise.
> Heil does not make any in this range and most active noise reduction
> headphones (e.g. Bose) only have 10-15 dB.  Here are some examples of what
> Barry meant:
>
> http://www.extremeheadphones.com/ex-29.html
> http://www.sennheiserusa.com/private_headphones_dj-headphones_004974
> http://www.etymotic.com/ephp/er6.aspx
>
> These are all available in the $75-100 range.
>
> 73,  Bill
>
>
> Doug Turnbull wrote:
>>
>> Barry, Sorry but what do you mean by 'high isolation headphones'.   Would
>> the Heil Pro-Set Plus do?
>>                 73 Doug EI2CN
>>
>> -----Original Message-----
>> From: [hidden email]
>> [mailto:[hidden email]] On Behalf Of Barry N1EU
>> Sent: 07 February 2010 01:01
>> To: [hidden email]
>> Subject: Re: [Elecraft] K3 in a cw pileup - needs work
>>
>>
>>
>> Barry N1EU wrote:
>>>
>>> You need to maximize your rf/af dynamic range - that is what is going to
>>> turn that mush into a beautiful symphony of distinct signals of varying
>>> levels.  What has worked well for me is AGC off (although AGC on works
>>> fine as well), high isolation headphones, and the gain throttling
>>> techniques (most important) described by K3NA, W4ZV, myself, and others.
>>>
>> Just to continue from previous post - I experienced only mush in pileup
>> reception until fully adopting this technique.  High isolation headphones
>> are critical because you want to set gain such that weak signals are
>> lightly
>> heard but clearly copiable.  You're maximizing the receive dynamic range
>> delivered to your ears and the high isolation means you can clearly hear
>> fainter signals without turning up the gain and squashing the dynamic
>> range
>> (and too frequently engaging AF Limiter with AGC Off).  
>>
>> 73,
>> Barry N1EU
>>
>> --
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