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G8MNY > TECH 24.06.05 12:36l 105 Lines 4642 Bytes #999 (0) @ WW
BID : 51195_GB7CIP
Read: GUEST OE7FMI
Subj: Trio TS700G CW KOX add on unit.
Path: DB0FHN<DB0MRW<OK0PPL<DB0RES<DK0WUE<SP7MGD<7M3TJZ<ON0BEL<GB7CIP
Sent: 050624/1020Z @:GB7CIP.#32.GBR.EU #:51195 [Caterham] $:51195_GB7CIP
From: G8MNY@GB7CIP.#32.GBR.EU
To : TECH@WW
By G8MNY
This is a homemade double sided PCB unit that plugs into the rear auxiliary
socket, CW jack & Phono PTT socket.
It provides..
1/ CW Kox (key up Tx automaticly
2/ CW sidetone (acoustic buzzer) (if a mic sidetone mod done in Headphones)
3/ Key level convertion from - voltage on key to + (auto/bug keys need this)
4/ As well as repeating the Aux socket, CW key jack & Phono PTT.
CIRCUIT
ÚÄÄ<9 RAW DC
ÚÄÄÄÄÄÄÂÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÅÄÄ>9 +17V
³ ³ ÃÄÄ<8 Tx Enable
3K3 ³ ÀÄÄ>8
³ ³/e ÚÄÄ<7 Dirty PTT
Phono PTT (Ä¿ ÃÄÄÄÄ´PNP ÀÄÄ>7 Return (earth)
Earth in (ÄÙ 10K ³\ T1 ÚÄÄ<6 KOX PTT
& Out ³ ³ ÚÄÄÄ´ ÚÄÄÁÄÄ>6
³ ³ ³ _³_D2 ÚÄÄÄ´ ÚÄÄ<5 (my Squelch)
CW Jack vÄ)ÄÄÄÄÄÄÄ´ ³ \_/ D3 ³/ ³ ÀÄÄ>5
Socket ÄÄÄ´ ³ ³ ÃÄÄÄÄÄÂÄ39RÄ´>ÃÄÂÄ56KÄ´T2 ³ ÚÄÄ<4 Mic Ground
³ u22³ ³ ³ ³ ³ ³\e ³ ÀÄÄ>4
³ === ³ BUZZER ÃÄÄÄ´ÃÄÄÄÄ)ÄÄ1MÄÄÄ)ÄÄÄ)ÄÄÂÄÄ>3 Mic (sidetone)
³ C1 ³ ³ ³ ³ C4 1n ³ ³ ³/ ÀÄÄ>3
³ ³ ³ ³ C1 ³ +³ ÀÄ´T3
³ ³ ³ ³ 22u=== 6u8===C3 ³\e
ÃÄÄÄÄÂÄÄÁÄÄ)ÄÄÄÁÄÄÄÄÄÁÄÄÄÄÄÄÄÄÄÁÄÄÄÄÄÄÄÄÄÄÄÁÄÄÂÄÄ<2 Dirty Earth
³ _³_D1 ³ ÀÄÄ>2
CW Jack ÄÄÙ /_\ 10K AUX PLUG ÚÄÄ<1 LS
Plug oÄÄÄÄÄÄÄÁÄÄÄÄÄÙ L.S.o1 9o 17V DC ÀÄÄ>1
-6V PTT Ret o o 17V DC
Mic o o Spare
Mic GND o o o PTT
Sq
HOW IT WORKS
An earth on the CW key after filtering with C1 turns on PNP T1, that in turn
via D2 sounds the buzzer (a crude small tin can tone osc unit).
T1 collector voltage also power on NPNs T2 & T3 PTT rig operating via the peak
hold time delay D3 & C3, that puts the rig on Tx & holds it there for half a
second or so longer than the CW is being sent. T3 has to be a TIP type as it
has to conduct the high PTT relay current.
The rigs CW Key socket that normally has -6v it now has 0.6V (earth) via the
10K & +ve clipping diode D1. The rig sends CW carrier.
With a headphone Mic Tx sidetone modification I have, a small amount of buzzer
ripple is added to the mic circuit to provide headphone sidetone as well.
PCB LAYOUT
CW Jack
_________________ÚÄÄÄ¿_
/ ,---, C4 ÚÁÄÄÄÁ¿\
³ / AUX \ C2ÀÂÄÄÄÂÙ ³
³³ 9pin ³D3 \__/ ³
³ \ / ____ C1 > < ³
³ '---' / \ ³__³ ³
ÀÄÄÄ¿ / \ ³
³T2³ BUZZER ³ ³
³T3 \ / ³TOP
³PHONO\____/ D1 ³
ÀÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÙ
CONSTRUCTION
The unit is made from double sided PCB that will cover the AUX B9A socket, the
phono PTT socket & the CW jack socket.
1/ AUX. The most difficult bit was to make the 9 pin plug on the PCB. I drilled
the 9 holes & knife cut around each of the 9 pins (except the dirty earth),
both sides of the double sided PCB. Then soldered in 1mm copper wires that
protruded 8mm both sided & checked it plugged into the rig OK. Then I
soldered on a 9 pin B9A valve base (as I wanted the Aux socket function for
other things as well).
2/ CW Jack Pin. Next I marked out the exact location of the rigs' CW jack
socket, drilled a whole to take the pin from an old jack plug, removing some
of the rig side pcb to leave the pin insulated. Soldered on the tube & put
in the jack pin & insulating collar. Cut he track around the pin centre & DC
test OK.
3/ PHONO. Next I marked the exact location of the rigs' PTT phono socket
drilled & fitted a 3mm dia pin from an old phono plug. Then cut the PCB
around both sides of the pin & added a phono socket on top. This phono
socket only provides stability for the PCB & could be left as a large access
hole in the PCB if you like.
4/ Now build up the circuit on cut pads in the available space & wire to the
connectors as needed.
5/ Cut off surplus PCB.
TESTING
Make sure there is no shorts on the +DC rail as this can damage the rig! Put
the rig into a dummy load & switch to CW position. Plug in the adapter & check
out the features are all working one at a time.
Why Don't U sent an interesting bul?
73 de John G8MNY @ GB7CIP
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