[Elecraft] K2 SSB Performance Improvement

[Brian Denley]

Thanks Don, Jim and George.  I would guess that any method that shapes the audio would have the same desired effect i.e. different mic element, equalizer, etc.

Brian 
KB1VBF
Sent from my iPad

> On Feb 10, 2015, at 1:54 AM, Don Wilhelm <w3fpr at embarqmail.com> wrote:
> 
> 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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