W4UVV
Member
First I am not a teckie but I am fairly profiicient with computers and scanners usually being successful with most things I attempt. I have mast mounted preamps on a number of Scantennas tower mounted. I am located in central Va. and have excellent signal ground wave coverage. I have several R7000 analog receivers, a PSR600 and 4 996XTs. I programed the 996XTs for most of the radio systems in Va.
MOTOTRBO is beginning to appear. One rural county SO now uses it. Tuning a R7000 on UHF I am receiving two very strong area signals that as best as I can determine are MOTOTRBO.
I have modified my R7000s for discriminator tap (unfiltered audio). I am an Win XP OS baseline person. I do have a Windows 7 computer I acquired recently because it was a good deal but rarely use because of software incompatibilty issues involved with Windows 7 executing older software which represents most of what is on my desktop XP. I know the R7000 is an analog receiver. After spending most of yesterday reading posts on this forum to the point of mental fatigue and trying to understand them, I decided to give it a try.
I was encouraged to read DSD was ported to a Windows 7 environment. I downloaded it from the Wiki site link and to my surprise after tuning to a strong area MOTOTRBO signal on 461.5125 mhz. I am receiving audio.....mushy audio. I almost can understand what is being said. The audio sounds like SSB on the wrong side. My first impulse was to change the polarization of the signal. Ok. How do I do that?
I have one executable file and one bat file for Windows 7. They are "dsd.exe" and "PROVOICE.bat". That's it...no user software selectable options like I have seen posted. I assume that software is being run in MS DOS. I am using "line input" to the sound card. The signal is quite strong. The mode setting is "NFM". The R7000 has excellent frequency stability.
Assuming these parameters are correct but using the R7000 is not acceptable, is the issue because I am not using a 996XT unfiltered audio? If so that brings up another problem. In the past I had no problem modifying a BCD796 using a .01mF capacitor in line at the discriminator tap point on the pc board. However, when I attempted to modify a 996XT at the two labeled "DISC" pc board tap points I did not receive any audio output. One tap point clearly marked is on the bottom of a pc board and the other on the top pc board near IC3. I received no audio either with the capacitor removed. Obviously I did something wrong and failed to find the correct tap point. Can anyone provide me the correct location tap point for the 996XT? I was not able to locate the information browsing Wiki. I may have missed it.
Any helpful comments appreciated.
Remember, I am not as advanced technically as many of you are so please bear with me. Tnx.
Attached are 3 screen captures. Pictures 1 and 2 have little audio but frequent data transmissions on 463.6325 mhz. Picture 3 is the one where now as I type mushy audio has been almost constant on 461.5125 mhz.
MOTOTRBO is beginning to appear. One rural county SO now uses it. Tuning a R7000 on UHF I am receiving two very strong area signals that as best as I can determine are MOTOTRBO.
I have modified my R7000s for discriminator tap (unfiltered audio). I am an Win XP OS baseline person. I do have a Windows 7 computer I acquired recently because it was a good deal but rarely use because of software incompatibilty issues involved with Windows 7 executing older software which represents most of what is on my desktop XP. I know the R7000 is an analog receiver. After spending most of yesterday reading posts on this forum to the point of mental fatigue and trying to understand them, I decided to give it a try.
I was encouraged to read DSD was ported to a Windows 7 environment. I downloaded it from the Wiki site link and to my surprise after tuning to a strong area MOTOTRBO signal on 461.5125 mhz. I am receiving audio.....mushy audio. I almost can understand what is being said. The audio sounds like SSB on the wrong side. My first impulse was to change the polarization of the signal. Ok. How do I do that?
I have one executable file and one bat file for Windows 7. They are "dsd.exe" and "PROVOICE.bat". That's it...no user software selectable options like I have seen posted. I assume that software is being run in MS DOS. I am using "line input" to the sound card. The signal is quite strong. The mode setting is "NFM". The R7000 has excellent frequency stability.
Assuming these parameters are correct but using the R7000 is not acceptable, is the issue because I am not using a 996XT unfiltered audio? If so that brings up another problem. In the past I had no problem modifying a BCD796 using a .01mF capacitor in line at the discriminator tap point on the pc board. However, when I attempted to modify a 996XT at the two labeled "DISC" pc board tap points I did not receive any audio output. One tap point clearly marked is on the bottom of a pc board and the other on the top pc board near IC3. I received no audio either with the capacitor removed. Obviously I did something wrong and failed to find the correct tap point. Can anyone provide me the correct location tap point for the 996XT? I was not able to locate the information browsing Wiki. I may have missed it.
Any helpful comments appreciated.
Remember, I am not as advanced technically as many of you are so please bear with me. Tnx.
Attached are 3 screen captures. Pictures 1 and 2 have little audio but frequent data transmissions on 463.6325 mhz. Picture 3 is the one where now as I type mushy audio has been almost constant on 461.5125 mhz.
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