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G8MNY  > TECH     10.11.24 11:33l 148 Lines 7356 Bytes #999 (0) @ WW
BID : 19649_GB7CIP
Read: DJ6UX GUEST
Subj: CW "K" pip tone unit
Path: DB0FHN<DB0RKB<DK0WUE<PI8ZTM<CX2SA<GB7CIP
Sent: 241110/0900Z @:GB7CIP.#32.GBR.EURO #:19649 [Caterham Surrey GBR]
From: G8MNY@GB7CIP.#32.GBR.EURO
To  : TECH@WW

By G8MNY                                    (Updated Jan 10)
(8 Bit ASCII graphics use code page 437 or 850, Terminal Font)

This is an add on for anyone who wants an optional automatic CW "K" PIP tone
after each over. This used to be popular for short SSB overs under QSB/QRM
conditions like during contests, as it stops doubling etc. & in my experiance
actually speeds up the contact with less contest oriantated stations.

Other Morse letters are possible, but not exceeding 9 time slots that this
circuit gives, see REPEATERS below.

It has an internal PP3 battery to run the unit while on Tx, which is very
lightly trickle charged from the PTT line on Rx to maintain the battery.

SCHEMAIIC
        旼컴컴컴컴컴커
    旼<캑PTT Triggers쳐<컴컴컴컴컴컴컴컫컴컴컴컴컴컴컴컴컴컴컴컴�<>PTT
    �   읕컫컴컴컴컫켸    旼컴컴컴커   �
 Off�   On �       쳐컴>컴큁TT Hold쳐>켸
Trig�  Trig쿝eset  쿎ount 읕컴컴컴켸      旼컴>K LED
 旼컨커    �  旼컴컨컴�    旼컴컴커    旼컨�   旼컴컴커   旼컴컴�
 �27Hz�    읕>큃ipple 쳐�>캑 Code 쳐�>캑AF 쳐>캑 Tone 쳐>캑Tone 쳐>Mic
 쿚SC 쳐컴>컴캑Counter쳐�>캑Diodes�    쿚sc�   쿑ilter�   쿗evel�
 읕컴켸       읕컴컴컴�    읕컴컴켸    읕컴�   읕컴컴켸   읕컴컴�

Features include an LED showing PIP tone is armed (lit during Tx overs) & a "K"
LED showing the K leaving.

CIRCUIT
 旼컴컴컴컴컴컫컴컴컴컴컴컫컴컴컴컫컴컴컴컴컫컴캑>쳐컫컴컴컴쩡컴컴커 MIC RIG
===    Hold hi \�        R7       �         �   D8  _�_    _�_PIP  � PTT PTT
 쿎1   for K  T2쳐컴커    �      R14        �       /_\  <�/_\LED1 �  �   쳐커
R1            e/�    R6  === C4   �        R15     D9쳐컴컴�)컴컴컴)컴)컴캑 R25
 �            �      �    �       � +9V     �        �     R22   ON픬/o o켸  �
 쳐R3컫컴컴컴컨컫컴컴)컴컴)컴컴컴컨컴컴컴컴�)컴컫컴컴)컴컫컴좔컫컴컴o/o oOFF �
 �  �/e         �    �    �                 � �/e    �  +쿎10  �  SW1 �      �
 쳐캑T1         �    쳐컴�)컴컴컴R16컴컴컴컴좔큈5    �  ===    �      쳐�<쳐켸
 �  �\          �    쿗ong쿞tart K  ___IC2    �\ PTT �  _�_    �     +� D10
 �    쿛TT      �    �    쳐컴컴컴캐1  A\4011   쿚/P �         �  9v 컨�
===   쿞tart    �    �   R8        �2   3)o�   R17 �/    旼컴컴� Batt �
 쿎2  쿝eset    �    �   _�_ 旼R10캐____/  �    쳐캑T6  _�_    �  PP3 �
 �    �         �    �       쳐R11쩡컴컴컴켸    �  �\e  \_/�>K �     _�_
 �    �  C3     �    �      ===   � ____  CW   R18   �   � LED2�
 �    � 渼쳇컴컴)컴컴)컴R5컴캑C5  처5  B\ Clock 쳐컴켸  R23    �
 �    � �  넬컴컨컴커�       �    납6   4)o�   _�_       �     �
R2    � �  윰14 16 3넨 D1    �27Hz윰____/  �           �/      �
_�_   � 쳐컴�13    2낫>쳐�   읕컴컴컴컴컴컴�   旼컴컴컴큈4     �
      쳐)컴캐15    4냐�>척 K _._    ___+14     �       �\e     �
      � �   �      7낫>쳐탠컴컴컴컴�8  C\     R19       _�_    �
     R4 �   � IC1  1냐�>척 Morse   �9  10)o�   �             �/
      � �   �4017  6낫>쳐�   旼R12캐____/  �   쳐R20컫훀21컫캑T3
      � �   �      9냐�>척   쳐R13쩡컴컴컴켸   �    ===C7  � �\e
      � �   �  8  11낫>쳐�  ===   � ___-7  AF  �     읕컴컴)컴캑    C9
      � �   읕컫컴컴� D7 �   쿎6  처12 D\  Osc �    AF    === VR1<컴늘훀24�>MIC
      � �      �        R9   �    납13 11)o쩡컴�  Filter C8�   � O/P
      읕좔컴컴컨컴컴컴쩡켸   �1kHz윰____/  �               쳐컴� Level
     Ripple Counter  _�_     읕컴컴컴컴컴컴�              _�_

COMPONENTS
C1,2,4,7,9. 10n            R1,2,3,5,6,10,11,12,13,15,16. 390K
C3. 10p                    R7,17,18,25. 10K
C5. 47n                    R8. 1M
C6. 1n2                    R4,9,14,19,20,21. 47K
C8. 4n7                    R22,23. 470R
C10. 10uF                  R24. 100K
D1-10 1N4148               VR1. 10K
IC1 4017 Cmos Ripple       LED1 Red
IC2 4011 4x Cmos Nand      LED2 Yellow
T1,2,5. Small signal PNP   SW1 Double pole C/O
T3,4,6. Small signal NPN

HOW IT WORKS
The On/Off switch, switches power & also re-routes the PTT line via steering
diode D9 (in case the battery is flat). A light trickle charge for the battery
via R27 & D10 is taken off the PTT line when on Rx whether the unit is switched
on or off & is low enough current to be suitable for most dry cells.

When Mic PTT is low the LED1 lights via R22 & briefly pulses on T1 via C1 & R1
with C2 & R2 providing a power up pulse, T1 resets the ripple counter IC1 ready
for the 1st CW clock pulse. The Mic PTT low also turns on PTT drivers T5 via
R15 which turns on T6 via R17/18 to repeat the PTT condition to the Rig.

On release of the Mic PTT a long +ve pulse is feed into Gate A of IC2 via R7,
C7 & discharged by R8. This enables the oscillator IC2 Gate A & B. With C5 &
R10, R11 it oscillates around 27Hz which forms the "dot time" for the CW.

The CW CLOCK is filtered (kept clean on power up etc) with R5 & C3 to feed the
ripple counter IC1. The "Q0" pin 3 output line is low from 0-10 count & is used
to drive T5 via R16 for PTT as with the Mic while the "K" Pips are generated, &
it also drives T2 via R6 to maintain the long CW CLOCK gate ON pulse.

Ripple outputs "Q1" to "Q9" Pins 2 4 7 = dash, 10 = gap, 1 = dot, 5 = gap,
6 9 11 = dash, are diode gated D1-D7 & R9 to make up the timings for the "K".

The +ve CW signals control the AF oscillator in the same way as the CW CLOCK.
The AF oscillator is made from IC2 Gate C & D, & with the C6 & R12/13, it
oscillates around 1kHz.

The square wave AF output from IC2D drives T4 via R19 to light the LED2 via R23
to indicate "K" is going out, & also feeds the AF to the Butterworth filter
R20/21 & C7/8 to T3 emitter follower, to shape the tone to a near sine wave.
T3 is only biased on by the mean DC level of the TTL output when present. T3
feeds the output level setting pot VR1 which in turn feeds the K tones to the
Mic AF line via a DC blocking Cap C9 & a high value attenuator R24.

IN USE
This is not needed on FM as the squelch tail tells the end of overs quite well.
But for weak fading SSB signals or under heavy QRM it gives a very clear &
unambiguous end of the over, that like all CW can be easily heard compaired to
a voice ending.

REPEATERS
Lots more letters are possible for repeaters etc. without going into the
complexity of computers & Pics etc. Here with just a few more diodes & a pull
down R per letter. But don't use more that 2 diodes in series to get a letter!

Possible letters are... A,B,C,D,E,F,G,H,I,K,L,M,N,R,S,T,U,V,W,5.

Letters that are NOT possible are.. J,O,P,Q,X,Y,Z,1,2,3,4,6,7,8,9,0

 旼컴좔컴컴컴엿
윰14 16 Q0  3넨旼�>쳐컴쩡컴컴컴컴컴컴컴컴컴�>H ....
캐13    Q1  2냐� 渼>쳐�)컴컴컴컴컴컴컴컴커
캐15    Q2  4냐컴좔�>쳐)컴컴컴컴컴컴컴쩡�)컴>D _..
 �      Q3  7냐�>쳐컴컴탠컴컴�>쳐컴컴캑  �
 �      Q4 10냐캑>쳐컴�)컴컴컴컴컴컫컴)컴)컴>L ._..
 쿔C1   Q5  1냐�>쳐컴컴탠컴�>쳐컴컴�  �  �
 �      Q6  5냐캑>쳐컴�)컴컴컴컴쩡�)컴)컴)컴>U .._
 �4017  Q7  6냐�>쳐컴컴탠캑>쳐컴�  �  �  �
 �      Q8  9냐캑>쳐쩡�)컴컴컴쩡)컴)컴)컴)컴>K _._
 �           넬�>쳐�)컴)컴컴쩡)�)컴)컴)컴�
 �   8  Q9 11냇캑>쳐�  쳐�>쵬 � �  �  �  쳐�>B _...
 읕컴쩡컴컴컴�      �  쳐캑>쳐� �  �  �  �
                   RK  RH      RU  RL RD RB

A multi way logic selector etc, to select the letter before the AF osc to
give... No modulation = no CW, K = OK, B = On Battery Power. L= Low Mod,
H = High Mod, U = Freq Up, D = Freq Down, all depending on Modulation & FM
Discriminator DC output etc..


Why Don't U send an interesting bul?

73 De John, G8MNY @ GB7CIP


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