CPI Communications TTP-N User Manual

Instruction Manual

TTP(N) Series
Tone Termination Panel
01/2013
Board Assembly TTP2N Rev. B

CPI Communications 941 Hensley Lane Wylie, Texas 75098

Phone [phone] [phone] Fax [phone] [phone] www.cpicomm.com

TTP(N) Specications

Specications: Subject to change without notice

Size: 5.5” wide

1.5” high

5.3” depth

Weight .75 lbs (without case)

1.5 lbs (with enclosure -C option)

Connections: modular to phone line (remote)
screw terminal connector (radio)

Line impedence: 600 ohms

Input voltage: +12 to +13.8 VDC @ 150 mA (18 mA idle)

Line output to phone line: +10 dBm maximum. Preset to 0 dBm

Line ouput from phone line: -40 dBm to +10 dBm (function tone referenced)

RX input from radio: 70 mVrms or greater

Notch lter: 2175 Hz down 50 dB from 1000 Hz reference

Control tones: Guard tone = 2175 Hz for 40 mS

Function tones
F1 = 1950 Hz for 40 mS
F2 = 1850 Hz for 40 mS
Monitor = 2050 Hz for 40 mS
Hold tone = 2175 Hz for duration of PTT

Control function outputs: PTT and Monitor selection are form “C” relay contacts
1 amp @ 30 VDC
F1/F2 are form “C” relay contact

Manual Contents

Page 2 Specications
Page 3 General Information, Installation
Page 4 Installation (cont), Tuning
Page 5 Tuning
Page 6 Jumper settings and radio connections
Pages 7-12 Schematics
Page 13 Board layout

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2.0 General Infomation

The CPI TTP(N) series termination panels provide a reliable means of interfacing a tone remote to a two way
radio base station. The TTP series can be used with any tone remote that uses the industry standard EIA se­quential tone format such as the CPI TR series remotes. The TTP(N) series panels are available in the following
congurations.

MODEL DESCRIPTION

TTP1(N) Board only single frequency, PTT, and monitor

TTP2(N) Board only two frequency, PTT, and monitor

-C(TTPN) Case option for the TTP(N)

There are no other options available for the TTP(N) series panels. Jumper selectable -4W/FD is standard as
well as automatic gain control and transmit and receive audio notch lters.

3.0 Installation

Connect the leased line, twisted pair 600 ohm line, or microwave link to the TTP(N) board via J2 (RJ-11 jack).
Connect an external 12 to 16 volt semi-regulated DC power supply to J1 with the positive lead to J1-2 and the
negative lead to J1-7.

Connect the receive audio from the radio to J1-6. Receive audio from the radio should be a source that is after
the squelch circuit and not affected by the radio volume control adjustment. If such as point is not easily acces­sible you may use unsquelched audio and use the squelch circuit provided on the TTP(N).

Connect the radio microphone input to J1-1. If the microphone input is high impedence, shielded cable should
be used and jumper JP3 on the TTP(N) board should be moved to the 2&3 position.

Connect the monitor circuit of the radio to the TTP(N) board using the form “C” relay contacts at J1-8, J1-9,
and J1-10.

Connect the radio PTT line to the TTP using the contact provided at J1-4. Jumper JP7 allows you to select “key
to ground” shorting pins 1&2 or “key to + voltage” shorting 2&3.

The TTP2(N) provides momentary or latched set of form “C” relay contacts for two frequency selection. Jump­er JP14 in position 1&2 is for latching. Position 2&3 is momentary operation.

2 Wire/4 Wire Full Duplex operation

The TTP(N) termination panel is 2 wire/ 4 wire full duplex capable by selection of the JP1 jumper on the panel.

2 Wire - Jumper JP1 should be in the 1 & 2 position
4 Wire/ Full Duplex - Jumper JP1 should be in the 2 & 3 position

3

4.0 Tuning

The TTP(N) termination panels 2175 Hz notch and bandpass lters and line balance adjusters have been factory
set. These adjustments have been “painted” and should not require readjustment in the eld.

If it does become necessary to “retune” the panel, the procedure is as follows:

TX Audio notch lter

1) Connect: Signal generator (600 ohm) set at 2175 Hz. 0 dBm to phone line J2
+12 volt power to J1-2
Ground to J1-7
Scope probes to TP4 & TP5, set scope to X-Y mode

2) Adjust R21 until signal on scope is in phase (loop closes on scope).

3) Remove scope probe from test point 4 & 5. With scope in signal channel mode, connect 1 probe to TP6.
Adjust R16 to obtain minimum signal on scope. Adjust R21 to further reduce signal level. Re-check R16 then
R21. Notch will be approximately -58 dB.

4) Move scope probe to TP7. Adjust R46 to maximum signal on the scope. (This is the 2175 bandpass adjust­ment.)

5) To set the balance, remove signal generator from phone line. Re-connect between ground and J1-6. Set
generator for 1500 Hz, at 2 Vpp. Terminate J2 with a tone remote or other suitable 600 ohm load. Move scope
probe to TP4 and adjust R100 for minimum.

RX Audio notch lter

1) Connect: Signal generator (600 ohm) set at 2175 Hz. 0 dBm to J1-6 & J1-7
+12 volt power to J1-2
Ground to J1-7
Scope probes to TP1 & TP2, set scope to X-Y mode

2) Adjust R8 until signal on scope is in phase. (loop closes on scope)

3) Remove scope probe from TP1 & TP2. With scope in signal channel mode, connect one probe to TP3. Ad­just R13 to obtain minimum signal on scope. Adjust R8 to further reduce signal level. Re-check R13 then R8.
Notch will be approximately -58 dB.

5.0 Level Adjustments

RX Audio Adjustment

R101 controls the RX audio level to the phone line. With the phone line connected at J2, connect a RMS volt
meter to the leads of L1 and L2. Un-squelch the receiver so that continuous noise is present and adjust R101 for
0 dBm or 0.8 Vrms on the meter. If additional gain is needed to achieve 0 dBm, move jumper JP6 to short pins
2 & 3.

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