Greetings
I have just finished installing the KSB2 into my K2 sn 3029. Both the KSB2
and the MH2 were recently bought.
I downloaded both Don's, W3FPR, and Tom's, N0SS, notes for alignment using
Spectrogram. Don suggests the lower roll off corner at 300Hz and Tom's
plots show it at 500Hz.
I set the filter up with the corner at 300Hz but on air tests with another
ham to listen on a second transceiver while the K2 transmitted into a dummy
load as suggested in the kit manual gave a very muffled sound. After
experimentation using ear only the reset filters were remeasured with
Spectrogram and showed the lower corner at about 500hz. Some on air qsos
still suggest that the signal still has too much bass.
It seems you do need to experiment like the manual suggests.
73s, Nigel ZL2DF
------------------------------
Message: 36
Date: Thu, 11 Nov 2004 21:50:22 -0500
From: "W3FPR - Don Wilhelm" <[EMAIL PROTECTED]>
Subject: Re: [Elecraft] How to set up SSB
To: "Dan Barker" <[EMAIL PROTECTED]>, "Elecraft"
<elecraft@mailman.qth.net>
Message-ID: <[EMAIL PROTECTED]>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
Dan,
You could try using the microphone direct into a tape recorder if the mic's
response is the primary question.
If you are referring to filter adjustments to match your voice, I think more
emphasis than necessary has been placed on refining the frequency range. If
you have set your FL1 BFO so that the lower frequency -3dB corner of the
SSB passband is at 300 Hz, you will be presenting the best frequency
response for communications use. Some exceptions do occur, but that is not
the norm.
OTOH, if you have questions about overloading and clipping and the effects
of compression on the fidelity of your voice or evaluating the response of
that particular microphone with the K2, listening on a separate receiver is
the best way to answer those questions. Of course, you can trust to another
ham who knows your normal voice and has a receiver adequate to evaluate the
signal - be certain that you are not overloading the receiver if that person
is a local.
As has been mentioned in a prior post, a simple DC receiver can be used to
tell you what your signal sounds like. DC receivers have all filtering done
at audio, and have potential to provide the best fidelity.
73,
Don W3FPR
----- Original Message -----
> I've just gotten my MH2 working again with a RadioShack 270-090
> element. I have no idea if that's the right part, but it appeared
> identical to the Heil part, and the o'scope says about 120 mV p-p when
> I talk normally (Measured at pin 5 of the SSB adapter - should be the
> same as mic connectory pin 1).
>
> Anyhow, I sold my "other" rig years ago as the K2 was all I appeared
> to need. I'm wondering how to deal with on-air reports of "horrible
> audio, almost unreadable" without hearing what I sound like.
>
> Ideas:
> a) Borrow an SSB rig and fix my K2.
> b) Try stuff randomly on the air and hope the other ops give
> consistent info.
>
> I'm not sure how much trouble a) would be, but it's most likely the
> best way. I wonder what the shipping would be to borrow an "extra" rig
> from someone? Any "spares" out there?
>
> b) should work, but I have SSBA-1, SSBA-2, SSBC 1:1, SSBC 2:1, SSBC
> 3:1, SSBC 4:1, the VFO (how to tune someone whose voice you don't
> know) and of course, the BFO.
>
> Varying all of these in an organized way is going to take another
> receiver or someone VERY patient on the other end of the aether.
>
> Ideas?
>
> Hey, anyone know of an Internet receiver I can listen through? That
> might work. Only thing I could find in the archives is
> http://www.smeter.net/ and it's off the air.
>
> Dan / WG4S / K2 #2456
>
>
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