去那里买75欧的同轴线?不合75欧标准的同轴线是否对声音有影响？

原上草

俺现在就用一根自制的RCA线对付着用，声音也不错

中尉

交易区新帖推荐

Canare有75欧的同轴线，性价比不错。还有专门设计的75欧RCA接头。

wvwvwv

去找找BELDEN的双层屏蔽镀银75欧同轴线吧，非常不错
爱立信也有这种线，就是很难找

上海老娘舅

上海虬江路有很多，很多，，，

1lobetr

标准的音响同轴线都是75欧的。

筑和

交易区新帖推荐

普通RCA信号线当同轴线是不行的，比了就知道了。

DMD888

有线电视的同轴都是75欧的。

mobilest

给个地址

我送你一条BELDEN的双层屏蔽75欧的线

徕卡

同轴线和信号线一样有个性，不同材料也出不同声音。

顺溜

原帖由 徕卡 于 2010-5-22 18:03 发表
同轴线和信号线一样有个性，不同材料也出不同声音。

不过您认为对声音的影响,是通过波形的区别,还是JITTER,还是别的?

输入端有整型,是否可以抵消阻抗匹配不当造成的波型畸变?

又回到以前的老话题,我认为信号波的模拟特性会影响声音,有人不同意,您认为如何?

请赐教[s:30]

乔治亚斯

看看这根如何？http://www.jd-bbs.com/thread-2276611-1-1.html

原上草

原帖由 mobilest 于 2010-5-22 17:59 发表
给个地址

我送你一条BELDEN的双层屏蔽75欧的线

感谢M版，尽管有些愧对老兄，因最近网购常遇上不顺心的事，对网购实在有些信心不足了，决定接受你的帮助，我的地址已PM你了

mobilest

原上草兄，

我送你的是Belden 1694A或1505A ，这也是央視指定使用的跳线；

https://edeskv2.belden.com/Produ ... tdetail&partid=3432

Coax - Low Loss Serial Digital Coax
RG-6/U Type, 18 AWG solid .040" bare copper conductor, gas-injected foam HDPE insulation, Duofoil® + tinned copper braid shield (95% coverage), PVC jacket.

Physical Characteristics (Overall)
Conductor
AWG:
# Coax AWG Stranding Conductor Material Dia. (in.)
1 18 Solid BC - Bare Copper .040


Insulation
Insulation Material:
Insulation Material Dia. (in.)
Gas-injected FHDPE - Foam High Density Polyethylene .180


Outer Shield
Outer Shield Material:
Layer # Outer Shield Trade Name Type Outer Shield Material Coverage (%)
1 Duofoil® Tape Aluminum Foil-Polyester Tape-Aluminum Foil 100
2   Braid TC - Tinned Copper 95


Outer Jacket
Outer Jacket Material:
Outer Jacket Material
PVC - Polyvinyl Chloride


Overall Cabling
Overall Nominal Diameter: 0.274 in.
Mechanical Characteristics (Overall)Operating Temperature Range: -30°C To +75°C
UL Temperature Rating: 75°C
Bulk Cable Weight: 41 lbs/1000 ft.
Max. Recommended Pulling Tension: 69 lbs.
Min. Bend Radius (Install)/Minor Axis: 2.750 in.
Applicable Specifications and Agency Compliance (Overall)
Applicable Standards & Environmental Programs
NEC/(UL) Specification: CMR
CEC/C(UL) Specification: CMG
EU CE Mark: Yes
EU Directive 2000/53/EC (ELV): Yes
EU Directive 2002/95/EC (RoHS): Yes
EU RoHS Compliance Date (mm/dd/yyyy): 01/01/2004
EU Directive 2002/96/EC (WEEE): Yes
EU Directive 2003/11/EC (BFR): Yes
CA Prop 65 (CJ for Wire & Cable): Yes
MII Order #39 (China RoHS): Yes
RG Type: 6/U

Flame Test
UL Flame Test: UL1666 Vertical Shaft

Suitability
Suitability - Indoor: Yes
Suitability - Outdoor: Yes - Black only
Suitability - Aerial: Yes - Black only, when supported by a messenger wire

Plenum/Non-Plenum
Plenum (Y/N): No
Plenum Number: 1695A
Electrical Characteristics (Overall)
Nom. Characteristic Impedance:
Impedance (Ohm)
75


Nom. Inductance:
Inductance (µH/ft)
0.106


Nom. Capacitance Conductor to Shield:
Capacitance (pF/ft)
16.2


Nominal Velocity of Propagation:
VP (%)
82


Nominal Delay:
Delay (ns/ft)
1.24


Nom. Conductor DC Resistance:
DCR @ 20°C (Ohm/1000 ft)
6.4


Nominal Outer Shield DC Resistance:
DCR @ 20°C (Ohm/1000 ft)
2.8


Nom. Attenuation:
Freq. (MHz) Attenuation (dB/100 ft.)
1.000 0.240
3.580 0.440
5.000 0.520
6.000 0.570
7.000 0.610
10.000 0.710
12.000 0.780
25.000 1.080
67.500 1.650
71.500 1.690
88.500 1.860
100.000 1.950
135.000 2.240
143.000 2.300
180.000 2.570
270.000 3.170
360.000 3.690
540.000 4.600
720.000 5.380
750.000 5.500
1000.000 6.420
1500.000 7.990
2000.000 9.370
2250.000 10.010
3000.000 11.780
4500.000 14.920


Max. Operating Voltage - UL:
Voltage
300 V RMS


Other Electrical Characteristic 1: Impedance tested in accordance with ASTM D-4566 paragraph 43.2, option 2 using a 75 Ohm fixed bridge and termination. 75 +/- 1.5 Ohms
Other Electrical Characteristic 2: Return Loss tested in accordance with ASTM D-4566 paragraph 45.3, using a 75 Ohm fixed bridge and termination.

Minimum Return Loss:
Start Freq. (MHz) Stop Freq. (MHz) Min. RL (dB)
5 1600 23
1600 4500 21


Sweep Test
Sweep Testing: 100% Sweep tested 5 MHz to 4.5 GHz.

[ 本帖最后由 mobilest 于 2010-5-23 05:24 编辑 ]

mobilest

贴个头子给你参考~~

Canare RCA Male For Belden 1694A


Price: $4.08 per EA

    Quantity:   
Quantity Discounts: Quantity Final Price
10 to 99 $3.96  perEA
100 Or More  $3.80  perEA

SKU: CANRCAPC53
Manufacturer Part Number: RCAP-C53
Manufacturer:   CANARE
Weight: 0.0344 lbs  

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Description:
Canare's new 75-ohm type RCA Video Crimp Plugs are impedance matched and total Canare Quality. Achieve outstanding analog and digital electrical performance with a usable bandwidth to 200MHz when matched with precision 75-ohm coaxial video cable. Great for Multimedia Patchcords, Hi-Res Video Monitors, SPDIF Digital Audio, Duplication Decks, VCR & Camcorders, Audio Interconnects.
•75-ohm construction; Crimp Pin & Sleeve.
•Gold Plated Center Shaft. Gold Plated Contact Pin "Snap Locks" into place, preventing pin migration.
•VSWR less than or equal to 1.1 DC to 200MHZ.
•No solderingrequired, assembly time reduced by >80%
•EASY FAST Assembly. Just 1) strip back the cable 2) Crimp on the center pin 3) Snap-lock the pin with cable into the RCAP body 4) Slide up the sleeve and crimpà that's all there is to it!
•Use standard Canare Crimp and Strip tools.
•For use with Belden 1694A, 9116, 9066, Commscope 2227K/V, 2229V.
•Canare Stripper TS100E.
•Canare Crimp Tool: TC-1
•Canare Die Set: TCD-35CA

原上草

M版是用线的行家，我的朋友对你的线很认同