crperryjr
10-24-2008, 03:29 PM
Hey everyone,
I was wondering if anyone is having the same issues I am regarding the 200mW Vastelec FM transmitter.
First, it is working. Much better than my old Belkin Mod'd transmitter I used last year, but I'm trying to fine tune it to at least a semblance of commercial quality.
The transmitter assembly is set up in my workshop which is about 30 feet from the road where people will be watching my show. I have a DIPOLE antenna I made of the correct length (89.3 FM=1.597m) tucked up in the roof of the workshop that is made from some stiff wire (coat hangers) and connected to the transmitter via a shielded coax cable. (Center wire to upper 0.799m, Sheathing to bottom 0.799m of anntena.) The antenna and FM transmitter are about 10 feet apart on seperate floors of my workshop. The antenna is about 16 feet in the air at it's highest point. I have mod'd the FM transmitter to emit RDS and that is working great. The whole deal is powered from the 12v side of my computer's power supply.
My issue is, on a MONO type FM receiver, (like a portable radio with only the one speaker in it.) the sound quality is excellent, and I have no hums, pops, or anything. Very happy with it. But on a stereo radio, like in my car or truck, the bass is garbally, and it sounds as though the music is "overamp'd" for lack of a better word. There is also a slight power hum when no music is playing. I've tuned the RDS down, so I know there's no noise coming from there. (You can tell the difference when the RDS is cranked to high.)
I've tried to modify my radios in my vehicles to find the best sound, and it seems if I turn the bass all the way off, it sounds better. Not great, but better. And there is still that power hum when nothing is playing. And I really don't want to put a sign out on my lawn- "Tune to 89.3, and turn off the BASS and set to mono." :)
The music I'm using (lots of different styles and formats) sounds good on my computer speakers, and on the mono FM receivers, so I don't think it's the music, nor the volume output of my sound card to the transmitter. (I tried lowering and raising that as well. Volume changed, but no difference in quality.)
Any ideas on why such a difference between Mono and Stereo receivers?
Thanks much for your help!
I was wondering if anyone is having the same issues I am regarding the 200mW Vastelec FM transmitter.
First, it is working. Much better than my old Belkin Mod'd transmitter I used last year, but I'm trying to fine tune it to at least a semblance of commercial quality.
The transmitter assembly is set up in my workshop which is about 30 feet from the road where people will be watching my show. I have a DIPOLE antenna I made of the correct length (89.3 FM=1.597m) tucked up in the roof of the workshop that is made from some stiff wire (coat hangers) and connected to the transmitter via a shielded coax cable. (Center wire to upper 0.799m, Sheathing to bottom 0.799m of anntena.) The antenna and FM transmitter are about 10 feet apart on seperate floors of my workshop. The antenna is about 16 feet in the air at it's highest point. I have mod'd the FM transmitter to emit RDS and that is working great. The whole deal is powered from the 12v side of my computer's power supply.
My issue is, on a MONO type FM receiver, (like a portable radio with only the one speaker in it.) the sound quality is excellent, and I have no hums, pops, or anything. Very happy with it. But on a stereo radio, like in my car or truck, the bass is garbally, and it sounds as though the music is "overamp'd" for lack of a better word. There is also a slight power hum when no music is playing. I've tuned the RDS down, so I know there's no noise coming from there. (You can tell the difference when the RDS is cranked to high.)
I've tried to modify my radios in my vehicles to find the best sound, and it seems if I turn the bass all the way off, it sounds better. Not great, but better. And there is still that power hum when nothing is playing. And I really don't want to put a sign out on my lawn- "Tune to 89.3, and turn off the BASS and set to mono." :)
The music I'm using (lots of different styles and formats) sounds good on my computer speakers, and on the mono FM receivers, so I don't think it's the music, nor the volume output of my sound card to the transmitter. (I tried lowering and raising that as well. Volume changed, but no difference in quality.)
Any ideas on why such a difference between Mono and Stereo receivers?
Thanks much for your help!