There seems to be two issues here. One is how the frequency response affects
the speech compressor, and the other is the frequency response that gets
transmitted.
The frequencies transmitted are controlled mainly by the SSB (OPT1) filter.
When properly aligned, the SSB filter (OPT1) bandpass is
I'm also agree with Fran, at least an explanation from Elecraft about
this mod would be really appreciated.
Le 05-08-28 à 13:18, Francis Belliveau a écrit :
I am now confused by the existence of two different mod's with the
same
goal.
It makes perfect sense to me that I should not be
On Sun, 28 Aug 2005 13:18:35 -0400, Francis Belliveau wrote:
I am now confused by the existence of two different mod's with the same
goal.
It makes perfect sense to me that I should not be wasting Tx energy on audio
frequencies as low as 20Hz. Beyond that I am somewhat in the dark.
Jim Brown
Fran,
I will not say that one is better than the other, but Jim's change only
deals with the mic input itself, while Stewart's change also deals with the
internal behavior of the Speech Compressor chip by changing C31 and resricts
the low frequency fed to the Balanced Modulator by the Speech
--- Francis Belliveau [EMAIL PROTECTED] wrote:
I am now confused by the existence of two different mod's with the same
goal.
There may be more than just two...
http://www.qsl.net/kd2bd/ksb2.html
It looks like many of us have been down the same road.
73, de John, KD2BD
Visit John
Jim wrote:
So when you use a communications mic, like a Shure 444 or the wildly
overpriced
Heil mics, you're simply compensating for that standard that was wrong in
the
first place! All of these mics have some variation of that peaked response
in
the 2-4 kHz region.
--
As
John, KD2BD wrote:
There may be more than just two...
http://www.qsl.net/kd2bd/ksb2.html
It looks like many of us have been down the same road.
As I understand the evolution (having followed it since I built S/N 1289 in
2000):
1)
Hi Ron.
Are you suggesting that those low frequencies are somehow being distorted or
causing other problems in the audio I.C. in the K2 before they get to the
filter?
I would say: YES.
Ideally, the audio frequency response prior to the compressor should
closely match the IF bandwidth of the
On Sun, 28 Aug 2005 12:59:40 -0700, Ron D'Eau Claire wrote:
Are you suggesting that those low frequencies are somehow being distorted
or causing other problems in the audio I.C. in the K2 before they get to
the filter?
Distorted no. Causing problems -- well, sort of. We don't transmit that LF
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