CRT France ss-6900 V3

RP Comms & Design UK©


















CRT France SS-6900 V3
Anytone AT-5555-V3
Mod kit ©



Internal Technical Version Only-Not For Public Release















Date: 15-03-2018 Revised 2.0

1















RP Comms & Design UK © November 2017 Revision 2



Disclaimer-It is assumed your have the technical ability & technical skills, correct
calibrated Test\RF equipment and tools to carry out these modification and comply with
all legal radio bodies and local laws enforced in your country of operation.

RP Comms & Design UK will not be held responsible for any legal losses, life,
equipment property or any other responsibilities in information provided to end user, use
of information is for educational purposes, please seek legal and technical advice is
subject to commercial and manufacturing uses.

The end user of this information is solely responsible for his or her actions in use of this
material and to ensure he\she abide by any Radio local or country laws and any other
legal duties enforced in your country of operation.

All information presented is the sole property of RP Comms & Design UK and shall not
be copied, altered in whole or part, without permission.
Any other parties’ information mentioned in this manual shall be credited and abide by
any or copyrights enforced.



Please contact rpcomms@gmail.com

Any web-links supplied on this document copyrights will apply to respective
owners and used in good faith.

2

Introduction

This Document written will help improve some of the shortcomings of the CRT
France SS-6900-V3-A or Anytone AT-5555-V3

11-10m band Multi-mode transceiver, especially for use in UK and EU states
where narrow fm 10khz spacing system is used more wildly.

FM Clipper corrected waveform and helps improve audio punch on
narrow 2.00khz Deviation Max FM CB EU 10Khz spacing use OR…
2.20khz Deviation Max FM UK40\HAm 12.5Khz spacing system use

Extended Audio Frequency Roll-Off on Transmission -for a brighter
transmitter modulation/The roll-off response is now around 4Khz.

FM receiver Detector- Audio gain recovered- has been increased to detect
fm deviations levels at the correct 60% deviation level for 10khz spacing FM
system. A full 5.5V RMS MAX audio into 8ohm load can now be obtained at
60% deviation.

Wider Filter for FMLT455GW-+/-4.5Khz 9.0Khz filter

RSSI-S-meter improved-less bouncy and smoother response, also helps the
CSQ detector

18Amp DC regulator upgraded and Internal Heat sink to keep cooler 15W
FM

DC ripple capacitor replaces stock one-now 4700uF 25V DC

Am\SSB agc overload improvements.

SSB IF gain and distortion improvements

RF gain and improved front-end protection and strong signal handling

Improvement of ASQ sensitivity as per V6 PCB

Improved Alignment of radio suited for EU\UK CB markets\operation.

New stock 600ohms fist microphone Moonraker CM-500U

*NEW-Fixed FM power 25W Max fixed
AM 6.5W Carrier (Variable) Max 25W PEP@90% Am modulation.



3



The following web links will provide handy reference guides to the radio.
And credit goes to Rick of Euro Radios for his re-mastered drawings and
schematic diagrams.
Please consider donating to this fab site to help support it.
www.cbtricks.com






















INDEX






PCB & Schematics (Ver 3.0)

http://www.cbtricks.com/radios/anytone/at_5555/graphics/br9000_rf_v3.pdf

Other parts see

http://www.cbtricks.com/radios/anytone/at_5555/index.htm



4

Parts to Changes



Remove parts and substitute with new values as listed.

All modifications have been verified as good.

ALL SMD Resistors are 0.1 WATT



DC Regulation and Ripple Caps

Fit Q55-MG9411
18 Amp 300W PNP 1off Loc Q55-2SA733 Up rated part
RS 737-8868


Heat sink 1off Loc-Q55
RS 402-967

Thermal Interface Pad RS 283-3638 1off Loc-Q55
Fibreglass, 0.9W/m·K,
28.96 x 20.57mm 0.178mm


Fit 4700uF Electro Cap RS
763-9431 or P 1off Loc E504-DC ripple


Addition IF 9.0 Crystal Filter (TBC)

470R 0603 Resistor 1off Loc- R152 470R filter

10PF 0603 Ceramic Cap 1off Loc—C225

10.695Mhz 9khz Band Width Roof Filter 1off Loc –CB2 10M08A


Hi-CUT-Tone

Fit C198 10nF 0603 Ceramic cap RS 915-5645 1off Loc-C198 223P
5
AM/FM Filter

Fit CF1 -LT455GW 9.0khz +/-4.5khz
bandwidth 1 offLoc-CF1 LT455HT fm receive


Techno Fix UK
https://shop.technofix.uk/lt455gw-9khz-wide-455khz-if-ceramicfilter-replaces-cfws455g

Fm Detector-AF Gain Original Value


Fit R254 3K9 0603 Resistor RS 679-0349 1 off Loc-R254-3K0
FM DET Gain

Fm RX & TX Narrow FM ETSI\EN specs Original Value


Fit C64 10nF 0603 Ceramic cap RS 915-5645 1off Loc-C64 473P
RX Audio roll off


Fit C136 10nF 0603 Ceramic cap RS 915-5645 1off Loc-C136 104P
RX Audio Tone Low
Cut

Fit R502 560R 0603 Resistor RS 679-0541 1off Loc-R502-4K7
TX AF Mic In

Fit R503 10K 0603 Resistor RS 678-9667 1off Loc-R503-22K
TX AF Mic In

Fit R573 0R 0603 Resistor RS 678-9670 1off Loc-R573-10K
TX AF Mic In

Fit R556 10K 0603 Resistor RS 678-9667 1off Loc-R556-33K
TX AF Gain U501A

68pF RS 014-7235 C502 101P(J) Fit C502 0603 Ceramic cap 1off
LocTX filter

Fit C525 68pF 0603 Ceramic cap RS 014-7235 1off Loc-C525 82P(J)
TX filter

Fit C543-150pF 0603 Ceramic cap RS 652-0178 1off Loc-C543-33P(J)
TX filter

Fit C501 150pF 0603 Ceramic cap RS 652-0178 1 off Loc-C501-101P (J)
TX filter
6
0R RS 678-9670 R500Fit R500 0603 Resistor 1off Loc- -2K2
TX FM AF Clipper

Fit R504 3K7 0603 Resistor RS 679-0336 1 off Loc-R504-15K
TX FM AF Clipper

Fit R507 5K1 0603 Resistor RS 679-0560 1 off Loc-R507-1K5
TX FM AF Clipper

Fit BAT54-S Diode SMD RS 544-4584 1 off Loc-JUNC R504/R507-TX
FM AF Clipper diode



RSSI

Fit R203\C47 2.2uF Radial Elec Cap RS 475-9352 1 off Loc-R203\C47-
fit across cap
RSSI S-Meter
attack time
Delay

Fit R205 10K 0603 Resistor RS 678-9667 1 off Loc-R205-100K


Fit across C139 68K 0603 0.1W Resistor RS 901-3636 1 off Loc-C139\Q31


Fit R50 270K 0603 0.1W Resistor RS 679-0077 1 off Loc-R50-220K


SSB AGC-Distortion fix

D25 0R RS 678-9670Remove and fit 0603 Resistor 1 off Loc-Remove D25

Fit R41-1K5 0603 0.1W Resistor RS 678-9908 1 off Loc-R41-1K SSB R-C
AGC

SSB IF Gain-Increased

FIT R122- 68R 0603 Resistor RS 213-2115 1 off Loc-R122-150R SSB IF



7


RF Gain Control and Overload Protection Improvements

R135 5K6,changed to 2K2 0603 SMD 1% 0.1W Resistor
1 off RS 213-2317

Add 1 off1N4148 RS 671-5477
From D3 Pin to (Anode) of 1N4148,and other end of 1N4148 (cathode)

Cut PCB track between L15 and C1
Fit a 33pF SMD 0803 RS 464-6600


Fit 2 off back-to-back 1N4148 silicon diodes RS 671-5477
from C1\33pF end to pcb ground

It was noted that at nearly maximum RF gain a glitch on the pot increases sensitivity,
while not a big issue, once past the maximum level gain drops to standard factory
sensitivity and is fine.

FM ASQ Improvements to V6 version

Check R242-180K change to
120K 0603 SMD 1% 0.1W Resistor 1 off RS 213-2547

Check R240 value is 104K
Set W1 for minimum sensitivity off around 0.15uV PD


Transmit Audio glitch-Power Microphones

1:1 Ratio 600ohm Audio Isolation Transformer 1off Loc-Pin 3 –MIC & Pin 4-GND
J1-CON4
Improved Microphone

A much-improved microphone was sourced, that gave excellent sound quality and low
cost replacement pre-wired.

Moonraker Part# CM-500-U 4 Pin Plug-Uniden

Note-Remove pin 4 wire-Stop scan.


8


Moonrake