pinout schematics for the remote speaker connection
If you use a single speaker then you want to wire to the tip and ring. If you use two speakers, then the - side of each speaker goes to sleeve. Then the + side of speaker A goes to tip and the + side of B goes to ring.
If you will use both speakers (one for each band) then use the explanation below. For a single speaker use the Yaesu adapter only, or replace the mono end connector on speaker with a stereo end. Connect the speaker wires to the tip and center band only. Aftermarket stereo to mono adapters short the tip and center bands together and will cause poor or low level audio on one or both bands.
Shell is common, tip is Band A, ring is Band B, if you want to use separate speakers for each band. Use a stereo-to-mono adapter (included with the FTM-400, anyway) to have both bands on one speaker.
Tip, ring, sleeve. Band A, Band B, ground.
If you use ONE speaker then use the tip and the ring.
The FTM-400 external speaker stereo jack outputs channel A audio on the tip, channel B on the ring, and chassis ground on the sleeve. A straightforward connection is to use two separate speakers - tip to one, ring to the other, and a common return to sleeve. Problems arise in two ways. First, if you plug a monaural plug into the stereo jack on the radio you get channel A on the tip but the long sleeve on the monaural plug shorts the channel B output to the sleeve ground. They give you an adapter plug to use a monaural speaker plug that ports the tip and ring connections straight through but not the sleeve ground connection. So when you plug a monaural speaker plug into the adapter it connects channel A to tip and channel B to ring, which winds up on the ground (sleeve) connection of the external speaker via the long sleeve. This essentially connects the external speaker across the two outputs so that one acts as the ground return for the other. That's fine and works well - unless the ground lead for the external speaker can find another connection to radio ground. That is the second problem area and is what happened to me. I tried to use a speaker that was mounted in another chassis that was connected to station ground, and one side of the speaker was internally connected to the chassis. The FTM-400 also had a connection to station ground via the ground connection on the power supply leads. So the grounded speaker chassis tried to short out the channel B audio through the external power wiring connecting everything together in the shack. The channel B audio was muted and distorted. Turning up the volume helped but I noticed the ammeter on the station power supply would bump on audio peaks. This was the tip to figuring out the grounding issue.
You can use a single external speaker with the Yaesu adapter if both of the external speaker connections are isolated from chassis ground. If the sleeve side of the speaker connection can connect back to the radio chassis, it will try to short out channel B audio.
"(A schematic ? For a stereo audio jack? They are all over the Internet. It's standard. It's not rocket science.
Tip, ring, sleeve. Band A, Band B, ground.
If you use ONE speaker then use the tip and the ring.
FFS.)"
The FTM-400 external speaker stereo jack outputs channel A audio on the tip, channel B on the ring, and chassis ground on the sleeve. A straightforward connection is to use two separate speakers - tip to one, ring to the other, and a common return to sleeve. Problems arise in two ways. First, if you plug a monaural plug into the stereo jack on the radio you get channel A on the tip but the long sleeve on the monaural plug shorts the channel B output to the sleeve ground. They give you an adapter plug to use a monaural speaker plug that ports the tip and ring connections straight through but not the sleeve ground connection. So when you plug a monaural speaker plug into the adapter it connects channel A to tip and channel B to ring, which winds up on the ground (sleeve) connection of the external speaker via the long sleeve. This essentially connects the external speaker across the two outputs so that one acts as the ground return for the other. That's fine and works well - unless the ground lead for the external speaker can find another connection to radio ground. That is the second problem area and is what happened to me. I tried to use a speaker that was mounted in another chassis that was connected to station ground, and one side of the speaker was internally connected to the chassis. The FTM-400 also had a connection to station ground via the ground connection on the power supply leads. So the grounded speaker chassis tried to short out the channel B audio through the external power wiring connecting everything together in the shack. The channel B audio was muted and distorted. Turning up the volume helped but I noticed the ammeter on the station power supply would bump on audio peaks. This was the tip to figuring out the grounding issue.
You can use a single external speaker with the Yaesu adapter if both of the external speaker connections are isolated from chassis ground. If the sleeve side of the speaker connection can connect back to the radio chassis, it will try to short out channel B audio.
"(A schematic ? For a stereo audio jack? They are all over the Internet. It's standard. It's not rocket science.
Tip, ring, sleeve. Band A, Band B, ground.
If you use ONE speaker then use the tip and the ring.
FFS.)"
So you calling the Ring "common" in a single speaker setup and Sleeve "common" with two speakers?
schematic
Band
A on one and band B on the other, I had not heard of this before. If
true, it's just the setup I'm looking for, course i will have to build
my own male plug for the two speakers.
The Yaesu MLS-200M10 Has the stereo plug but only one speaker.What is the reason for this?
http://cdn.head-fi.org/8/85/857c0c0a_stereo-adapter-1-4-to-rca.png
http://cdn.head-fi.org/8/85/857c0c0a_stereo-adapter-1-4-to-rca.png
After running the official Yaesu adapter for mono Speaker..the rig no longer will use internal audio speaker; seems they used a cheap china audio socket and 6 months of a plug stuck in its hole resulted on no longer being able to have internal audio speaker working..I hate cheap china parts used by excellent Japan manufactures... sure wish the other options like Taiwan were still open...
ReplyDeleteMade this adaptation using an old stereo patch cord, just spliced the wires to a mono speaker and it works fine. Thanks for this info. I know the FTM-350 hasn't been made in a few years now but I got it used last year.
ReplyDeletejust wanted to confirm what you did....
Deletestero connector tip goes to mono tip
stero connector ring goes to mono tip
stero shield goes to mono shield?
So if I want to run separate speakers for each band, do I need 8 ohm or 4 ohm speakers? The manual says AF output impedance is 4-16 ohm so maybe it doesn't matter.
ReplyDelete