[Elecraft] K2 SSB Performance Improvement

[Don Wilhelm]

Those mods are not 'official Elecraft', but will help in reducing the 
bass response of the KSB2.  That is a good thing with any microphone 
because the low frequency response just wastes power and does not add 
much to communications quality.

It is applicable for any microphone, not just the Heil.

73,
Don W3FPR

On 2/10/2015 12:57 AM, Phil Wheeler wrote:
> Good question. I've never had any issues with my audio reports, using 
> the Elecraft MH2 mic; in fact all audio reports have been positive. It 
> sounds like these mods are for the Proset K2 Heil mic/headset (I'm not 
> sure which Heil mic element is in this model).
>
> There were some K2 mods related to the SSB bandwidth, but these were 
> not so much "audio", if I understand the question -- though they would 
> impact the audio.
>
> 73, Phil W7OX
>
> On 2/9/15 8:33 PM, Brian Denley wrote:
>> George et al:
>> Did Elecraft ever adopt these (or any other) K2 SSB audio changes?
>>
>> Brian
>> KB1VBF
>> Sent from my iPad
>>
>>> On Feb 9, 2015, at 10:32 PM, George Winship, NC5G 
>>> <gwwa5uih at hotmail.com> wrote:
>>>
>>> Thanks for posting this, Ray. I also was getting those kind of 
>>> reports on my
>>> K2. I was able to get the 1uF electrolytics but was unable to find the
>>> 0.1uF. G3RXQ was quick to respond to my email and said that a 0.1uF
>>> monolithic could be used instead. The results are great, as 
>>> confirmed by
>>> hams I talk to on a regular basis for many years.
>>>
>>> Now, if I could only get the circuit between my ears to work so that 
>>> I could
>>> tell that I had not put my K2 in split mode while trying to work K1N a
>>> little while ago, all would be good. The "frequency police" were not 
>>> bashful
>>> in letting me know the error of my ways.
>>>
>>> Thanks again.
>>>
>>> 73,
>>> George NC5G
>>>
>>>
>>>> Other K2 owners may be interested in this.
>>>> After getting many reports of poor quality transmit audio with my 
>>>> K2 (using
>>> the Proset K2 Heil boom >microphone and headset), I carried out the
>>> modifications described by G3RXQ which increase the lower cut >off 
>>> frequency
>>> of the microphone circuit on the KSB2.  This involves changing C34 from
>>> 2.2uF to 1uF, C31 >from 2.2uF to 1uF and C20 from 0.33uF to 0.1uF.
>
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