DHX TH-4B hotline Coupler

TH-4B hotline coupler professional hotline access and control devices available for all kinds of radio and television stations broadcast programs in use, is also applicable to electricity live conference, call recording and other occasions.

The main features

★ provides four telephone access, the conference call can be achieved

★ provide live audio and control interface of two chambers, the two live room for standby, users can switch as needed

★ has antisidetone network, each way has antisidetone adjustment switch must be switched on when you need to debug

★ broadcast mode offers no guide to facilitate implementation has directed and non-directed switch

★ real-time level display and volume control

★ 19 inch 1U standard chassis

★ The automatic lightning protection measures for the safe use of lightning-prone areas

Indicators TH-4B

★ Audio input: l 0KΩ 0db 6.35mm balanced three-pin plug (from Live Studio)

★ Audio Output: (1) 20Ω balanced 0db 6.35mm three-pin plug (to live room)

(2) 600Ω (mixed output) Unbalanced-10db 6.35mm three-pin plug

(3) 16Ω (headphones) 6.35mm three-pin plug

(4) 8Ω (Intercom output) Non-6.35mm semi-balanced three-pin plug

★ Frequency Response: 300Hz - 3 KHz

★ Distortion: ≤ 1%

★ SNR: ≥ 70db (excluding telephone line noise)

★ sidetone suppression: ≥ 45db

★ Power consumption: 10W

Technical performance TH-4B

◇ The product is a professional hotline access and control devices available for all kinds of radio and television stations for use in live broadcasts, but also applicable to conference calls, call recording and other occasions.

◇ provides four telephone access, use of microcomputer chips and electronic switching technology, various control independent of each other, the Leads flexible operation, can achieve up to four phones simultaneously access between the audience and presenters, both the audience and the audience can be set to the conference call, talk freely, but also to implement call hold, respectively conversation.

◇ provide standby live audio and control interface of two chambers, the user can add a small box with a control and the corresponding control cable, you can achieve both a hotline broadcast room timeshare unit.

◇ Each road has antisidetone adjustment switch, can get better sound quality phone, avoiding harmful acoustic feedback.

◇ directed and presenters in a small box built-in call control device includes a microphone and speaker (moderator can call for access to the mixer output or headphone splitter), and a call button, making internal calls become very convenient .

◇ No directed mode is suitable for the case where only the presence of host and switch automatically answer the hotline.

Construction and installation of TH-4B

Panel

The following figure shows the front and rear panel structure functions TH-4B hotline host coupler schematic.

Front panel

1, TELOUTLEVEL live room the size of the transmitted signal adjustment knob (with level indicator) to the telephone line.

2, TELINLEVEL telephone line to send the signal size adjustment knob (with level indicator) to the live room.

3, headphones volume adjustment knob.

4, l live room and live room 2 select switch.

5, a live room and live room 2 switching directions, the red indicator light automatically directed state.

6, headphone jack.

7, the power switch.

The rear panel hosts

8, the power outlet.

9, fuse holder (0.25 A).

10, control cable interfaces, from left to right are connected directed chamber, the second live room, the first live room.

11, audio input and output interfaces, from left to right are mixed output, go to the second live room, go to the first live room, live room from the second, from the first live room.

12 Telephone Interface (LINE outside line, PHONE access telephone).

13, lightning protection ground terminations.