[Elecraft] K2 SSB Performance Improvement

[Phil Wheeler]

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.