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KSB2 Observations and Questions

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Dean44

KSB2 Observations and Questions

I just built and installed the KSB2 for my KS SN5319. I used the capacitors
for 2.6 MHZ bandwidth and the transmit audio sounds excellent and full
bodied as tested on my Mark V. I did notice on the receive audio that there
is some roll off below 450 HTZ regardless of where the filter/BFO is set.
The roll off is gradual until it gets to the filter edge so I am not too
concerned about this for communications purposes, but it does take away from
the ability to get that full bodied sound on receive that I get on my Mark
V. I suspect that this roll-off must be in the audio circuit and I wonder if
anybody else has ideas on this.

The other thing is that the compressor does not seem to work. There is no
detectable difference between 1:1, 2:1, 3:1 or 4:1 settings. The transmitted
signal sounds really good otherwise. I am using a standard Yaesu MH-31
dynamic mic that is known to work good on other radios.

Thanks for your help and ideas!

Dean

KG7MZ

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N2TK

RE: KSB2 Observations and Questions

Hi Dean,
I had made some resistor changes to increase the compression. It works well
now. I do not have my Elecraft notes handy but I got the info to change from
the following web site. I couldn't find the English version of this.
N2TK, Tony

http://www.mydarc.de/df7khk/dwn/ksb2_mod.pdf

-----Original Message-----
From: [hidden email]
[mailto:[hidden email]]On Behalf Of Dean Fewkes
Sent: Monday, February 20, 2006 2:29 PM
To: [hidden email]
Subject: [Elecraft] KSB2 Observations and Questions

I just built and installed the KSB2 for my KS SN5319. I used the capacitors
for 2.6 MHZ bandwidth and the transmit audio sounds excellent and full
bodied as tested on my Mark V. I did notice on the receive audio that there
is some roll off below 450 HTZ regardless of where the filter/BFO is set.
The roll off is gradual until it gets to the filter edge so I am not too
concerned about this for communications purposes, but it does take away from
the ability to get that full bodied sound on receive that I get on my Mark
V. I suspect that this roll-off must be in the audio circuit and I wonder if
anybody else has ideas on this.

The other thing is that the compressor does not seem to work. There is no
detectable difference between 1:1, 2:1, 3:1 or 4:1 settings. The transmitted
signal sounds really good otherwise. I am using a standard Yaesu MH-31
dynamic mic that is known to work good on other radios.

Thanks for your help and ideas!

Dean

KG7MZ

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_______________________________________________
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