Thanks Richard.....


"Richard Edwards" wrote in message
...
On Mon, 5 Jan 2004 22:55:01 -0000, "k"
wrote:

Could anyone in the group advise on the pin-out wiring for the main
handset
to the Seavoice RT660 vhf radio? It's a telephone type handset with mike,
earpiece and PTT combined.

6 wires (2 red on PTT, 2 black on mouthpiece/mic and 2 white to the
earpiece/phone speaker) Could be simple, but the 6 wires run to a 5 pin
plug, so at least 1 pair will be commoned, I presume. Trial and error
could
run it down, but I may fry the rig in that process.

Any help on which colours to connect to which pins on the plug would be
greatly appreciated. Also any advice on how best to solder this lot as
the
pins are tiny, the multicore wires are very thin and the insulating
sleeves
melt with the soldering iron a meter away!

Constructive comments/help greatly appreciated please....Keith

Sorry cannot help with pin outs (wot goes where). How did you get to
point where plug is separate from lead with no indication of what
wires went where?

Well, your right, I should have taken more care when I desoldered the partly
damaged assembly. I took a note of the pin-out, but have misplaced it...The
difficulty in working by trial and error is that if the TX relay is
triggered without the RX side of the TCVR being isolated (like the PTT
switch does), then the whole RX side of the set can just get fried (I
think!)

As a general statements when soldering to small plugs.
1 strip and each wire back about 5mm
2 If two wires go to one pin twist them together
3 Tin each wire. Use a temp controlled soldering iron if possible.
50wat temp controlled far better than a cheap 15w non controlled.
4 cut off each wire so that 1-2 mm of tinned uninsulated wire shows
5 assemble connector hood components onto cable
6 place sleeve over each wire. wires should be as long as possible but
still allow hood to cover. Some bunching of wires under hood when
assembled is possible.
7 Get hold of a mating socket to the plug. Clamp socket in a vice,
insert plug to socket. You now have a solid work area with the socket
acting as a heat sink and retaining the alignment of the plug pins.
8 Using a fine tip bit, tin each pin solder bucket

We're on the same wavelength to this point. - the difficulty seems to be
that the 6 signal wires in the mutlicore lead are very fine copper spiral
wound along what appears to be a soft plastic core which melts when the
copper outer spiral is heated. Very flexible, but almost impossible to 'tin'
before making the join. I think this multicore is some kind of P.O. spec
cable and someone has suggested it's designed for srimp connecting, not
soldering. I can't see how I could crimp up such fine wires into tiny pins
on the plug. Brain surgery would be easier! Maybe easier to replace the
whole curly lead with less flexible plain copper wire multi?


9 Solder each wire to the appropriate pin. With tinned well and tinned
wires it will take a second or so each. Work from inside pins to
outside.
10 Inspect and ensure all ok
11 Slide sleeves down wires
12 Hot air to shrink if heat shrink sleeves.
13 Fit shroud
14 Plug into R/T
15 Test

I'll be happy to get here by the spring and boating by the summer!

16 Go boating

Richard

Nb "Pound Eater" Parkend G+S

Many thanks for your detailed guidance.

Cheers.....keith