Heil HC4 Element - Audio Increase - K2

[Sara, VU3RSB - India]

Hi Friends

Need a help for my Elecraft k2 SL No:2569. I have recently converted my HC4 - Head set in a Microphone with Sewing Machine paddle as Foot Switch.

Connected Audio - 1 PTT - 2 and 7 & 8 as Ground in the 8-Pin DIN Connector. HC4 is giving low audio. When i compare with Dynamic Microphone is giving good result (Yaesu MH-31 Converted for K2). HC4 is not giving the good output audio. I remember frank, DL4KQ gave me the modification document which i lost. Can any one guide me on the modification of Resistor to increase level of audio for HC4.

With Diagram and modifications would helpful to fix the problem.

See you soon from IOTA.

Regards
Sara, VU3RSB
--
-------------------------------------------------------------------------------------
R.Sarath Babu, VU3RSB
Elecraft SL No:2569
Personal: http://www.qsl.net/vu3rsb
Member in VU4 Dxpedition in 2004, 2006
Member in VU7 Dxpedition in 2006
Hon.Member of Wellington Radio Club, U.S.A
"Our Towering Times" correspondent from India
Amateur Radio International Communications Coalition - India Liason Officer
Member of Amsat - India



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[Don Wilhelm-4]

Sara,

I just answered the same question (or similar) for another ham on the
reflector earlier this evening.  See the following:

73,
Don W3FPR
-------------------------------------------------------------------

Robert,

If you are not certain of the filter alignment for SSB FL1 = OP1, then
that is the very first thing to do.  No other changes will be effective
if the filters/BFOs are not set correctly.

If you have a low output microphone, I suggest you try changing the R14
resistor first because that is easy to do and many have found it adequate.

A microphone preamplifier would be my second choice, mounted either
externally or between the K2 front panel and control board (builder's
choice).

As a good 3rd alternative, add the KI6WX Increased SSB RF Gain Mod to
the KSB2.  If you choose this mod, be aware that with the KPA100, you
must also make modifications to the KSB2 ALC area.  Download the
document at Tom Hammond's website www.n0ss.net related to this mod so
you have the documentation for both the original mod and the ALC changes.

73,
Don W3FPR

Ffive VHN wrote:
 > 'allo,
 >
 > Here is this old chestnut again. I've looked thought the archives and
found lots , too much info.
 >
 > In order of easiest/most efficient, what are the best mods ,
 >
 > Is it?
 >
 > 1, change the R14 1k resistor to a 10k resistor on the KSB2 board.
 >
 > 2, build an audio amp from the microphone.
 > (can someone please point me in the right direction for an easy
simple cct, tnx.)
 >
 > 3, re align  the filters,
 >
 > thanks
 >
 > Robert F5VHN
 >


Sara, VU3RSB - India wrote:

> Hi Friends
>
> Need a help for my Elecraft k2 SL No:2569. I have recently converted
> my HC4 - Head set in a Microphone with Sewing Machine paddle as Foot
> Switch.
>
> Connected Audio - 1 PTT - 2 and 7 & 8 as Ground in the 8-Pin DIN
> Connector. HC4 is giving low audio. When i compare with Dynamic
> Microphone is giving good result (Yaesu MH-31 Converted for K2). HC4
> is not giving the good output audio. I remember frank, DL4KQ gave me
> the modification document which i lost. Can any one guide me on the
> modification of Resistor to increase level of audio for HC4.
>
> With Diagram and modifications would helpful to fix the problem.
>
> See you soon from IOTA.
>
> Regards
> Sara, VU3RSB
>

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