JK Audio CellTap 4C Wireless Phone Audio Tap User Guide
- June 5, 2024
- JK Audio
Table of Contents
CellTap 4C™
Wireless Phone Audio Tap
User Guide
Welcome
Thank You
Thank you for purchasing the JK Audio CellTap 4C™. Please read this guide for
instructions on using it.
Getting Assistance
If you have technical or application questions: In the US & Canada, call us
toll-free at: 800-552-8346
In all other countries dial:
815-786-2929 (M-F 8:30-5:00 pm Central
Time Zone)
Email us at: [email protected] Or, and check
out our FAQ section for answers to common questions.
Limited Warranty
CellTap 4C is covered by a 1-year warranty to be free from defective
workmanship and materials. To obtain service, contact JK Audio by phone or
email for return authorization. Once authorized, you will carefully pack and
ship the faulty product and all accessories to us. You will pay for shipping
to us and we will pay for the return back to you. This warranty does not cover
damages due to accident, weather, fire, flood, earthquake, misuse,
unauthorized repairs or modifications, or damages that occurred in shipping,
only defective workmanship or materials. There are no expressed or implied
warranties that extend beyond the warranty here made.
RF Noise
Wireless phones generate substantial radio frequency (RF) noise during a call
which can easily leak into audio cables or equipment. Be sure to keep the
wireless phone 1-2 feet away from any audio cables or equipment. It is also
important to keep the wireless adapter cord away from any other audio cords.
Road Safety
Never use headphones while driving or cycling, etc. It can be dangerous to
turn up the volume even while walking. Doing so may hinder your hearing and
can be hazardous on the roadways or at pedestrian crossings.
WARNING!
There are many laws that prohibit the recording of telephone conversations
without prior consent from both parties. Be sure to check the laws in your
area.
Note: While CellTap 4C was designed to be very rugged and durable, it is not waterproof and care should be taken to keep the unit dry.
Features
| HD Voice* | Screwdriver Caller Level adjustment |
|---|---|
| 3.5 mm TRRS Headset Jack | Switch Selects Between Popular |
| 3.5 mm TRRS Cable to Device | TRRS Configurations |
3.5 mm TRS Stereo Mic Level Output
to Recorder| Passive, no AC or Battery Power Needed
* HD Voice.
While standard phone calls have a narrow bandwidth of 300 Hz to 3.4 kHz, HD
Voice calls offer 50 Hz to 7 kHz bandwidth. The additional 1.5 octaves on the
low end give the voice a more natural sound, while the additional upper octave
dramatically improves speech clarity and intelligibility.
To take advantage of this extended bandwidth, both phones on the call must
support HD Voice, and both phones must be on the same carrier, in coverage
areas that support HD Voice.
Introducing CellTap 4C
CellTap 4C™ is an interview-recording adapter that connects between your
existing earbuds/headset and cell phone, providing stereo output to a recorder
or mixer.
CellTap 4C™ is compatible with most smartphones, tablets, and notebooks that
use the 3.5 mm 4-conductor TRRS headset jack. Simply connect CellTap 4C
between your existing ear-bud headset and phone, and then connect the stereo
output to a mic level input on your recorder or mixer. The transformer coupled
stereo output provides the local mic on the left channel and the caller on the
right channel. Local audio is a full bandwidth connection, meaning your voice
will sound considerably better than the caller. Of course, audio quality is
limited by the quality and placement of the microphone on the ear-bud style
headset. CellTap 4C™ will not interfere with headset button controls on most
devices. A headset is required for operation, as the phone will not recognize
CellTap 4C without a headset connected.
Configuration
TRRS Configurations
If the headset is not working properly, try changing the TRRS configuration.
To switch the standard, disconnect all cables, open up your CellTap 4C by
removing the cover, flip the switch and close it back up. The internal switch
supports the following wiring standards:
| Standard| T| R1| R2| S
---|---|---|---|---|---
A:| OMTP| Left Output| Right Output| Mic| Ground
B:| AHJ (Default)| Left Output| Right Output| Ground| Mic
C:| AHJ (Alternate)| Left Output| Right Output| Ground| Mic
OMTP: Open Mobile Terminal Platform, AHJ: American Headset Jack.
The A setting is wired for the Original Nokia standard. The B and C settings
are wired the same and are used on most phones. The C setting reduces noise on
many Smartphones. However, this position may potentially disable music/phone
controls on the iPhone and other phones. Use (default) Position B for the
iPhone or any phone or device that experiences trouble with music/phone
controls under position C.
Phones are continuously changing so trial and error may be the best method to
determine which position is best for your particular phone.
Caller Level Trim Pot
Caller Level Trim-Pot adjusts the level of Caller audio on your recordings.
This adjustment lets you more closely match the level of your voice to the
caller’s voice. This ratio will likely remain the same after the initial
adjustment.
FAQs
Will CellTap 4C work with any cell phone?
CellTap 4C has been tested with many popular brands and model phones that use
the 3.5 mm 4-conductor TRRS style headset. However, there are no industry
standards, so we cannot promise compatibility with any brand or model phone.
Will any earbuds/headset work?
The earbuds/headset you use with Celltap 4C must use a 4-pin 3.5mm TRRS plug
and must include a microphone. Earbuds/headphones are meant only for listening
to audio and using a 3-pin 3.5mm TRS plug will not work.
What if my phone does not have a headset jack?
CellTap 4C works with most original manufacturers (Apple, Samsung, etc)
headphone adapter cables. However, customers have reported that some third-
party adapters do not work or add considerable noise.
I am getting noise on my recordings. How can I stop this?
Some phones simply generate too much Radio Frequency (RF) energy to allow a
clean recording. In some cases, even a phone that normally produces little or
no noise on a recording may produce higher levels of noise due to the
environment. A wireless phone must increase its
Technical Information
transmit power when signal strength weakens. This may occur in vehicles and large buildings, as well as in rural areas.
- Check the User Guide for instructions on adjusting the internal headset type switch.
- Try positioning cables and your recorder away from the phone.
Specifications
Output
| 1/8” (3.5mm) Stereo: | 600 ohms, 2.4 mV RMS (-50 dBu nom.) |
|---|
MISC
| Size: | 2” x 2” x 1.3” (5.1 x 5.1 x 3.3 cm) |
|---|---|
| Weight: | 3.5 oz |
CellTap 4C™
Wireless Phone Audio Tap
User Guide Version 4/16/22
JK Audio, Inc.
1311 E 6th St. Sandwich, IL 60548
United States
Telephone: 815.786.2929
Toll-Free: 1.800.jk audio
Fax: 815.786.8502
www.jkaudio.com
© 2022 JK Audio, Inc. All rights reserved.