Message 23636 in TECH.WW
From: G8MNY
Date: Sat, 06 Jun 26 08:33:00 Z
Newsgroups: TECH.WW
Subject: Trio TS700G CW KOX add on unit.
Message-ID: <61660_GB7CIP>
Path: N2MH4|VE3KPG|GB7CIP
R:260606/0838Z 32023@N2MH4.#SENC.NC.USA.NOAM LinBPQ6.0.24
R:260606/0837Z 23772@VE3KPG.#ECON.ON.CAN.NOAM BPQK6.0.25
R:260606/0833Z @:GB7CIP.#32.GBR.EURO #:61660 [Caterham Surrey GBR]
From: G8MNY@GB7CIP.#32.GBR.EURO
To : TECH@WW
By G8MNY (Updated Sep 09)
(8 Bit ASCII graphics use code page 437 or 850, Terminal Font)
___________________________________________
This is a homemade double sided PCB unit that fits over and plugs into the rear
auxiliary socket, CW jack & Phono PTT socket of the rig.
It provides..
1/ CW Kox (key up Tx automaticly
2/ CW sidetone (acoustic buzzer) (& if a mic sidetone mod done in H/P as well)
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.
SCHEMATIC
-6V PTT Ret o o 17V DC AUX PLUG
Mic o o Spare & SOCKET
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 powers on NPNs T2 & T3, PTT rig held operating via
the peak hold time delay D3 & C3, that puts the rig on Tx and holds it there
for half a second or so longer than the CW is being sent. T3 has to be a TIP
type NPN 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 and +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
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 and put
in the jack pin & insulating collar. Cut he track around the pin centre and
DC test OK.
3/ PHONO. Next I marked the exact location of the rigs' PTT phono socket
drilled and fitted a 3mm dia pin from an old phono plug. Then cut the PCB
around both sides of the pin and added a phono socket on top. This phono
socket only provides stability for the PCB and 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 and 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 and switch to CW position. Plug in the adapter and
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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