I used the mod to oopen my Kenwood 950 sdx to 6.7kc, I turn hidden menu 21 off, while checking the bandwidth on my flex, I seen the bandwidth is about 4 to 4.3 kz wide not 6.7 ?
What do I need to do ? Just got 950 sdx, thought it was just a menu selection, but its not yet. while keyed, I turn the 8.83 filter off, trying to get as much band width as possible.
Any help would be appreciated.
thanks
Kenwood 950 SDX Help to open band width up : Please !
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Voodoo Guru
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Howdy KA1CDE,
Welcome to the Forum.
Well, there are several factors that you have to consider that you did not elude too.
1 - You need a microphone that has the high frequency response to send to the Transmitter. A stock mic is not going to do that for you.
2 - We have never tried this on a Stock SDX so as to what the actual high Frequency Response of the stock Mic Amplifier in the SDX is, we don't know. The 6.7Kc specification was given for a Modified SDX. These modifications directly inject the Rack Audio into the DSP and bypass the limiting internal Mic Preamp in the rig.
Check out John, NU9N site, he has a host of great info about this kind of stuff.
http://www.icycolors.com/nu9n/
Let us know what you are trying to do there and what you are doing it with.
Take care,
Welcome to the Forum.
Well, there are several factors that you have to consider that you did not elude too.
1 - You need a microphone that has the high frequency response to send to the Transmitter. A stock mic is not going to do that for you.
2 - We have never tried this on a Stock SDX so as to what the actual high Frequency Response of the stock Mic Amplifier in the SDX is, we don't know. The 6.7Kc specification was given for a Modified SDX. These modifications directly inject the Rack Audio into the DSP and bypass the limiting internal Mic Preamp in the rig.
Check out John, NU9N site, he has a host of great info about this kind of stuff.
http://www.icycolors.com/nu9n/
Let us know what you are trying to do there and what you are doing it with.
Take care,
Voodoo Guru
From Deep in the IDD of the Sub-Harmonix Realm
From Deep in the IDD of the Sub-Harmonix Realm
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Voodoo Guru
- VooDoo Site Admin
- Posts: 722
- Joined: Wed Feb 23, 2005 8:47 am
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Howdy,
We ran a few tests here on the Stock SDX Mic Amplifier and the Modified TX Audio Input as far as to what the TX frequency response is.
For the test we used a Frequency sweep from 10cps to 10Kc generated by Adobe Audition 3.
Test conditions for the Stock SDX Mic Amplifier:
The above audio sweep was input to the Front Mic jack on the SDX using an I-Box thru a mixer, with the SDX Mic Gain set at 10:00.
The audio level was then adjusted on the I-Box to give 150 watts output with no ALC showing on the ALC Meter.
The TX Monitor audio being sent to the Computer sound card (modified AudigyII ZS) and measured with the SpectraPlus Spectrum Analyzer Software.
NOTE: The TX Monitor Frequency response on the Modified SDX is much wider and flatter then the TX Monitor in the Stock SDX.
The measured Frequency response of the Stock SDX Mic Amplifier is from 26cps to 6.7Kc.
The reason the low frequency response is so good is because there is a capacitor changed down stream of the Stock Mic Amplifier as part of the TX Audio Modifications.
Normally they arn't this good as they roll of a little higher.
Ref the Following Graph:
Test conditions for the Modified SDX TX Audio Input:
The above audio sweep was input to the DSP Unit circuitry of the SDX using a Jensen Transformer thru a mixer thereby bypassing the stock SDX Mic Amplifier circuitry.
The SDX Mic Gain was set at 10:00.
The audio level was then adjusted on the Mixer to give 150 watts output with no ALC showing on the ALC Meter.
The TX Monitor audio being sent to the Computer sound card (modified AudigyII ZS) and measured with the SpectraPlus Spectrum Analyzer Software.
The measured Frequency response of the Stock SDX Mic Amplifer is from 21cps to 6.7Kc. Ref the Following Graph:
Conclusion:
It looks like the High Frequency response of both Audio inputs are about the same,
with the Low Frequency response being extended slightly with the Modified Audio Input.
The main difference between the 2 methods of Audio input is in the clarity and cleanliness of the audio offered by
the direct input thru the Jensen Transformer which bypasses the Stock Mic Amps.
The actual Sonics of the Audio is much improved with this Direct method, but the Stock Mic Amps are really not that bad.
Well we hope this answers some questions.
Take Care,
We ran a few tests here on the Stock SDX Mic Amplifier and the Modified TX Audio Input as far as to what the TX frequency response is.
For the test we used a Frequency sweep from 10cps to 10Kc generated by Adobe Audition 3.
Test conditions for the Stock SDX Mic Amplifier:
The above audio sweep was input to the Front Mic jack on the SDX using an I-Box thru a mixer, with the SDX Mic Gain set at 10:00.
The audio level was then adjusted on the I-Box to give 150 watts output with no ALC showing on the ALC Meter.
The TX Monitor audio being sent to the Computer sound card (modified AudigyII ZS) and measured with the SpectraPlus Spectrum Analyzer Software.
NOTE: The TX Monitor Frequency response on the Modified SDX is much wider and flatter then the TX Monitor in the Stock SDX.
The measured Frequency response of the Stock SDX Mic Amplifier is from 26cps to 6.7Kc.
The reason the low frequency response is so good is because there is a capacitor changed down stream of the Stock Mic Amplifier as part of the TX Audio Modifications.
Normally they arn't this good as they roll of a little higher.
Ref the Following Graph:
Test conditions for the Modified SDX TX Audio Input:
The above audio sweep was input to the DSP Unit circuitry of the SDX using a Jensen Transformer thru a mixer thereby bypassing the stock SDX Mic Amplifier circuitry.
The SDX Mic Gain was set at 10:00.
The audio level was then adjusted on the Mixer to give 150 watts output with no ALC showing on the ALC Meter.
The TX Monitor audio being sent to the Computer sound card (modified AudigyII ZS) and measured with the SpectraPlus Spectrum Analyzer Software.
The measured Frequency response of the Stock SDX Mic Amplifer is from 21cps to 6.7Kc. Ref the Following Graph:
Conclusion:
It looks like the High Frequency response of both Audio inputs are about the same,
with the Low Frequency response being extended slightly with the Modified Audio Input.
The main difference between the 2 methods of Audio input is in the clarity and cleanliness of the audio offered by
the direct input thru the Jensen Transformer which bypasses the Stock Mic Amps.
The actual Sonics of the Audio is much improved with this Direct method, but the Stock Mic Amps are really not that bad.
Well we hope this answers some questions.
Take Care,
Voodoo Guru
From Deep in the IDD of the Sub-Harmonix Realm
From Deep in the IDD of the Sub-Harmonix Realm
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Voodoo Guru
- VooDoo Site Admin
- Posts: 722
- Joined: Wed Feb 23, 2005 8:47 am
- Location: Down there on the right...
Howdy All,
With the same testing conditions as stated above,
we have took some pictures of the Transmitted Signal Bandwidth on the Tektronics 2712 Spectrum Analyzer.
This confirms what we saw on the TX monitor in the above pictures.
Ya'll have fun now, ya hear!!
With the same testing conditions as stated above,
we have took some pictures of the Transmitted Signal Bandwidth on the Tektronics 2712 Spectrum Analyzer.
This confirms what we saw on the TX monitor in the above pictures.
Ya'll have fun now, ya hear!!
Voodoo Guru
From Deep in the IDD of the Sub-Harmonix Realm
From Deep in the IDD of the Sub-Harmonix Realm
Kenwood 950 SDX Bandwidth Help
Thanks to those who replied, I can see some frequencies above 4kz maybe as high as 5.3kz
The mic is not stock here but a Neumann T103. I feed a Behinger 2496 using the PEQ and DYN only for tayloring my audio,
The plate effect comes for a Eurorack UB1204FX Pro.
The Mic is fed into the 2496, the 2496 into the 1204, then to an Ibox, then to the mic jack in the front of the 950SDX.
Are any of you using the compressor at all on the 950 SDX, just a litlle ?
Thanks for all comments, and yes I have been to Nu9N, w3ox web sites also.
Pat
The mic is not stock here but a Neumann T103. I feed a Behinger 2496 using the PEQ and DYN only for tayloring my audio,
The plate effect comes for a Eurorack UB1204FX Pro.
The Mic is fed into the 2496, the 2496 into the 1204, then to an Ibox, then to the mic jack in the front of the 950SDX.
Are any of you using the compressor at all on the 950 SDX, just a litlle ?
Thanks for all comments, and yes I have been to Nu9N, w3ox web sites also.
Pat