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Turner Plus 3 wiring?
- Thread starter Crambone
- Start date
Unit 75,
Early to mid 90's I ran a Turner Super Sidekick on my 2000GTL. I don't remember doing anything special to the mike but it has been a minute since then.
A quick peek at the schematic tonight of the +3 and the SSK show the same leaf switch arrangement???
73
David
Early to mid 90's I ran a Turner Super Sidekick on my 2000GTL. I don't remember doing anything special to the mike but it has been a minute since then.
A quick peek at the schematic tonight of the +3 and the SSK show the same leaf switch arrangement???
73
David
Dumb question, if he's using the right 4-5 pin adapter, then wiring the Turner for 4pin cobra should work no?
4-wire mike.
5-pin mike socket.
Math problem. 5 doesn't equal 4.
The 5-pin mike socket has two separate ground pins. One for the audio only, and one for the transmit/receive switching circuit only.
Each ground pin is separate to prevent feedback into the mike amplifier.
4-wire mike has only one ground, the shield braid.
You have three options.
1) Tie pins 2 and 4 together inside the mike plug, and hook the shield braid to that.
2) Connect the braid to pin 4 only.
3) Connect the braid to pin 2 only.
One of these tends to cause feedback squeal on transmit.
The other one will cause a feedback howl in the receiver audio, mostly in sideband modes.
The other one gets you feedback issues in both transmit and receive.
Turner introduced the "+3B" model when this kind of radio appeared in the late 70s. Has six wires in the cord so you can also use it with Johnson radios. The shield conductor is separate from the T/R switch common wire. Also has an added switch circuit that unhooks the audio wire from the preamp in receive. This stops the "deafening squeal in receive" problem may 23-channel AM-only radios would have when connected to a 4-wire power mike.
Turner sold an "upgrade" kit for those mike. It included additional leaf contacts and screws to add the switch circuits needed. The 5-wire or 6-wire cord was extra.
73
5-pin mike socket.
Math problem. 5 doesn't equal 4.
The 5-pin mike socket has two separate ground pins. One for the audio only, and one for the transmit/receive switching circuit only.
Each ground pin is separate to prevent feedback into the mike amplifier.
4-wire mike has only one ground, the shield braid.
You have three options.
1) Tie pins 2 and 4 together inside the mike plug, and hook the shield braid to that.
2) Connect the braid to pin 4 only.
3) Connect the braid to pin 2 only.
One of these tends to cause feedback squeal on transmit.
The other one will cause a feedback howl in the receiver audio, mostly in sideband modes.
The other one gets you feedback issues in both transmit and receive.
Turner introduced the "+3B" model when this kind of radio appeared in the late 70s. Has six wires in the cord so you can also use it with Johnson radios. The shield conductor is separate from the T/R switch common wire. Also has an added switch circuit that unhooks the audio wire from the preamp in receive. This stops the "deafening squeal in receive" problem may 23-channel AM-only radios would have when connected to a 4-wire power mike.
Turner sold an "upgrade" kit for those mike. It included additional leaf contacts and screws to add the switch circuits needed. The 5-wire or 6-wire cord was extra.
73
Evidently my Super Sidekick must have had the 6 wire cord and extra leaf switch arrangement. It has been almost 30 years.
Good information Nomad, as always.
Crambone,
Ken's Electronics in Michigan appears to have what you need (extra leaf switch contacts) to use the Turner +3 on your Cobra.
https://www.kenselectronics.com/lists/micpart.htm
TURNER B75255 Switch Modification Kit (for open audio) for +3 Desk Mic ($14.00)
I would think you could get a six wire mike cord about
anywhere.
Good Luck
73
David
Good information Nomad, as always.
Crambone,
Ken's Electronics in Michigan appears to have what you need (extra leaf switch contacts) to use the Turner +3 on your Cobra.
https://www.kenselectronics.com/lists/micpart.htm
TURNER B75255 Switch Modification Kit (for open audio) for +3 Desk Mic ($14.00)
I would think you could get a six wire mike cord about
anywhere.
Good Luck
73
David
Last edited:
AWSOME! Thank you everyone for the info the parts have been ordered. You guys always come through for us thank you so much for sharing all your knowledge.
Merry Christmas everyone,
Merry Christmas everyone,
Yes I followed NOMADS suggestion and added an extra set of contacts temporarily from a D104 just to test and check wiring and everything now works. So I ordered a set of contacts from Kens Electronics.
