K40 microphone

[Mooncat]

Has anybody got a wiring diagram?

Russ

[mike]

why not use a search engine!

http://www.homestead.com/tomcat964/cbradio.html

if its the compressor type

you will also need a 1k resistor & a 1n4001 diode mod kit to power the
thing.

mike

"Mooncat" <russe...@btconnect.com> wrote in message
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> Has anybody got a wiring diagram?
>
> Russ
>
>

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[Mooncat]

I did, but K40 came back with the wrong results.

Russ

"mike" <mi...@nospam.co.uk> wrote in message
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[mike]

ok what is the problem.? can i help u?
i know them well.
used em for +15yrs

mike

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[Mooncat]

Well I brought a good old K40 (an original one) last year for £5 and I
replaced the lead on it. I would now like to wire it up to my Yaesu 847.
I can remember having a K40 years ago (the original one) and it cam with a
wiring diagram. I reckon from that website I looked at that I may be able
to wire it up now. I know it needs 12v via a 1N004 diode, so what I might
do, instead of taking the 12v from the inside of the radio, I might take
some sort of wire from the inside of the plug. I haven't had time to have a
play yet though.

Russ

"mike" <mi...@nospam.co.uk> wrote in message

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[mike]

i use the 8v scan line direct to the capacitor...never runs out!

mike

"Mooncat" <russe...@btconnect.com> wrote in message

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[Mooncat]

Tell me more! I have just had a quick go at wiring it and now ive come to
a stop.

Is your's wired to a Yaesu?

Russ

"mike" <mi...@nospam.co.uk> wrote in message

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[Mooncat]

Pin 1 Up
Pin 2 +5v
Pin 3 Down
Pin 4 Fast
Pin 5 Gnd
Pin 6 PTT
Pin 7 Mic Gnd
Pin 8 Mic

Yaesu wiring

Russ

"Mooncat" <russe...@btconnect.com> wrote in message

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[mike]

yes & an icom & a couple of PMR sets.

the yaesu i have gives an 8v constant dc voltage on one of the mic pins.

use the (spare) black wire (it isd to 0v as is the screen.

i have a layout of the k40 board somewhere!!

move the black with on the board to the + of the cap.
you might want to use quite a few ferrite beads as well to stop the squeel
you might get on ssb.

just a quick note though.

http://www.uksmg.org/ft847.htm

this link gives good info on the radio.
i doubt you should need the compressor mic really, the audio resp on the rig
can be tailored far better by the onboard processor.

mike

"Mooncat" <russe...@btconnect.com> wrote in message

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[mike]

ok well the 5v will do fine.
it only needs 3.2 to work

mike

"mike" <mi...@nospam.co.uk> wrote in message

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[Mooncat]

Yaesu 847 K40

Pin

1 Up Not used

2 +5v

3 Down Not used

4 fast Not used

5 Gnd Black,switching ground

6 PTT Red,transmit

7 Mic Gnd Shield,audio ground
8 Mic White, audio

blue,receive

Mike, have I got the wiring to this correct? If so, where does the blue
wire go?

Russ

"mike" <mi...@nospam.co.uk> wrote in message

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[mike]

i cannot find my original k40 manual.
had it the other day for your enq.
i think blue is not needed as it is the RX wire.

wait a bit

mike

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