weaver@sfc.sony.com (Eric Weaver) (03/03/91)
I need to run a stereo audio signal from our studio to a cable company's head-end about two miles away. A four-wire non-directional phone line is $55/mo + 760 to set up, and will certainly require some serious EQ (loading coils are probably present). I'm wondering if there's a good way to get two 15KHz audio channels (or a single 53KHz one) over commercially available microwave or optical links. Can anyone suggest vendors and at least make a guess at prices? Thanks. Eric Weaver <weaver@sfc.sony.com> Sony Advanced Video Technology Center 677 River Oaks Pkwy, MS 35 Beautiful Industrial San Jose, CA 95134 (408) 944-4904
Kauto.Huopio@lut.fi (Kauto Huopio OH5LFM) (03/08/91)
> I need to run a stereo audio signal from our studio to a cable > company's head-end about two miles away. A four-wire non-directional > phone line is $55/mo + 760 to set up, and will certainly require some > serious EQ (loading coils are probably present). I'm wondering if Well, I think all you need is a good ol' four-wire. For two miles I think that you can send the composite stereo trhough one single pair without too much hassle. The only thing you'll propably need is two 300 ohm balancing transformers (?) and a good parametric EQ. During setup phase you'll need a good noise generator and signal analyser, but that's all! We had a scout camp radio station last summer and the transmitter was about four miles away in a telcom tower and the phone line there was about eight miles. We had Telelinks at each end (a system for sending audio over phone lines including remote transmitter control) and we put one stereo EQ to the studio end. Because our transmitter was just a mono one, we connected the two EQ channels together. Just before the transmitter we had Orban FM Optimod. The sound quality ... EARTHSHAKING! We just didn't believe our ears when we at first time put a monitor amp to the line at the transmitter site. Remember when ordering the line from the local telco that you want to have a DIRECT line to the cable company, pure copper and no coils whatsoever. Kauto Huopio (huopio@kannel.lut.fi) Mail: Kauto Huopio, Punkkerikatu 1 A 10, SF-53850 Lappeenranta,Finland
alans@hp-ptp.hp.com (Alan_Sanderson) (03/16/91)
Coastcom is a manufacturer of T1 networking equipment which
specializes in high fidelity audio transmission.
Coastcom
2312 Stanwell Drive
P.O. Box 27068
Concord, CA 94527
415-825-7500
Alan Sanderson HP AMSO Sunnyvale,CApozar@apple.com> (03/21/91)
In article <telecom11.186.11@eecs.nwu.edu> Kauto.Huopio@lut.fi (Kauto Huopio OH5LFM) writes: >> I need to run a stereo audio signal from our studio to a cable >> company's head-end about two miles away. A four-wire non-directional >> phone line is $55/mo + 760 to set up, and will certainly require some >> serious EQ (loading coils are probably present). I'm wondering if > Well, I think all you need is a good ol' four-wire. For two miles I > think that you can send the composite stereo trhough one single pair > without too much hassle. The only thing you'll propably need is two > 300 ohm balancing transformers (?) and a good parametric EQ. This will not work, unless you can get a all-pass filter to correct for the phase distortion that the parametric EQ will introduce into the path. I also haven't found a parametric EQ that will pass the 75KHz or so needed for composite stereo. Perhaps the orginal poster should consider an STL at 950MHz? Tim pozar@lns.com Fido: 1:125/555 PaBell: 415-788-3904 USNail: KKSF-FM / 77 Maiden Lane / San Francisco CA 94108
john@zygot.ati.com (John Higdon) (03/22/91)
Tim Pozar <farcomp!pozar@apple.com> writes: > Perhaps the orginal poster should consider an STL at 950MHz? Tim, shame on you. As you know, the rules are very specific about the uses to which a 950MHz channel can be put. It is ONLY for BROADCAST stations, and the primary purpose must be the transmission of main channel program. The band is so overcrowded now that legitimate broadcasters must use every trick in the book to keep one system from trompling another. Unless you have an AM or FM broadcast license, don't even THINK of applying for a frequency in the 950MHz STL band. John Higdon | P. O. Box 7648 | +1 408 723 1395 john@zygot.ati.com | San Jose, CA 95150 | M o o !
pozar@kumr.lns.com (Tim Pozar) (03/25/91)
In article <telecom11.186.11@eecs.nwu.edu> Kauto.Huopio@lut.fi (Kauto Huopio OH5LFM) writes: >> I need to run a stereo audio signal from our studio to a cable >> company's head-end about two miles away. A four-wire non-directional >> phone line is $55/mo + 760 to set up, and will certainly require some >> serious EQ (loading coils are probably present). I'm wondering if > Well, I think all you need is a good ol' four-wire. For two miles I > think that you can send the composite stereo trhough one single pair > without too much hassle. The only thing you'll propably need is two > 300 ohm balancing transformers (?) and a good parametric EQ. This will not work, unless you can get a all-pass filter to correct for the phase distortion that the parametric EQ will introduce into the path. I also haven't found a parametric EQ that will pass the 75KHz or so needed for composite stereo. Perhaps the orginal poster should consider an STL at 950MHz? Tim pozar@lns.com Fido: 1:125/555 PaBell: 415-788-3904 USNail: KKSF-FM / 77 Maiden Lane / San Francisco CA 94108