Repair my old VHF microphone?

[Murv]

Thanks Rob, don't feel quite so bad now!

Anyway, it was a depth sounder and, no, it doesn't work.

Right, back to the microphone.
All the screws were just blobs of rust so I've carefully cut them out with the Dremmel thingy and got it apart.
There's a Red (pin4) & Yellow (pin 1) wire which are connected, then what looks like a few strands of naked wire leading into the lead from pin 2, and two spare pins (6 & 5)
So, Black must go to pin 3?

EDIT: Just cut the wire back further, looks like the naked wire is wrapped around the Yellow one.
I can't find a wiring diagram anywhere, anyone have any ideas?

 

[VicS]

Thanks Rob, don't feel quite so bad now!

Anyway, it was a depth sounder and, no, it doesn't work.

Anyway, back to the microphone.
All the screws were just blobs of rust so I've carefully cut them out with the Dremmel thingy and got it apart.
There's a Red (pin4) & Yellow (pin 1) wire which are connected, then what looks like a few strands of naked wire leading into the lead from pin 2, and two spare pins (6 & 5)
So, Black must go to pin 3?

EDIT: Just cut the wire back further, looks like the naked wire is wrapped around the Yellow one.
I can't find a wiring diagram anywhere, anyone have any ideas?

My own radio is not a Seavoice but since I have a note of how the plug is wired i took a look.

I d guess the naked wire is the screen around the audio signal wire from the mike, which is the yellow one. Mine has a white wire.

Black i'd guess is the common negative or ground connection and red the connection to the PPT switch.
On mine the black and the screen are both on pin 3

If there is evidence, ie solder that there was a wire on pin 3 then that is almost ceratinly where it's come from

 

[Murv]

Many thanks for that, will give that a try

 

[pelissima]

Let's wish it will fire up in the end.
But regardless of efforts it will never indicate the depth in your position

 

[rob2]

You say that the Nasa depth sounder doesn't work, but that leaves a couple of questions, or more... Is it still connected to the transducer? Is it connected to 12V? Is the boat in water - they give very strange dispalys when there's no water to carry the signal? As it's free, I'd still download the manual and check everything is there and wired up before deciding it doesn't work.

Rob.

 

[Murv]

Thanks Rob, this was on talking to the previous owner, in his own words "it has a life of it's own!"

I assume it didn't do anything that the fishfinder doesn't cover though, except speed I guess?
I will try it, just to see what it does.

 

[rob2]

Judging by the square cover, it's one of the Clipper range of instruments. If it does depth, then it's either a single function Depth sounder or could be a Duet (speed and depth). Whichever it is will be written on the top right hand corner. A poor transducer installation can make them give strange readings - they don't like bubbles in their mounting or in the flow of water directly under the hull. Have a look at the transducer mounting, it could be glued to the hull with mastic or mounted in a tube which should contain enough oil to make a good coupling. They recommend "mineral oil" but I've always used whatever cooking oil I have to hand.

Rob.

 

[Murv]

Thanks Rob, she's being lifted out early next week so I'll be able to investigate then

 

[Bodach na mara]

Judging by the square cover, it's one of the Clipper range of instruments. If it does depth, then it's either a single function Depth sounder or could be a Duet (speed and depth). Whichever it is will be written on the top right hand corner. A poor transducer installation can make them give strange readings - they don't like bubbles in their mounting or in the flow of water directly under the hull. Have a look at the transducer mounting, it could be glued to the hull with mastic or mounted in a tube which should contain enough oil to make a good coupling. They recommend "mineral oil" but I've always used whatever cooking oil I have to hand.

Rob.

If it were a square cover, it would be from the Clipper range of instruments, but it looks rectangular to me, which makes it a Target instrument. Target are cheaper than Clipper but the covers are a lot better!

All old boats acquire old instruments that do not really work. I have a Knotmaster log that gave up several years ago and I replaced it with a Target speed and log instrument. Naturally the Knotmaster is still there as it fills a hole in the bulkhead. The Target is subject to erratic readings as the season goes on (despite regularly removing and cleaning the paddle wheel) so I mainly rely on the Satnav. I also have an antique Leisure Lines whirling neon echosounder which rarely gives readings in depths over 60 feet. After several years of tolerating this (if it does not read, we are in no danger of grounding) I supplemented it with a fishfinder. I have not removed the whirly one as it would leave an even larger hole in the bulkhead

 

[Murv]

Maybe I won't be in too much of a hurry to tear out redundant kit then, sounds as if it's part of the boats character!

 

[cornell_b]

not offended, just added that incase it was true, as something to consider, i did read the note here or the yachting site....who knows what our coastguard is doing.