RM Noise - How I hooked it up to my Icom 7300 with a few additions for ease of use on SSB & CW.
Posted: Sun Feb 18, 2024 9:38 pm
Hello Everyone,
I have been using RM Noise for 10 days now.
I have spent ALL of my waking hours on my 7300 with RM Noise.
In a nutshell I can tell you that on CW TX you MUST only be able to hear live audio side-tone on CW and be able to easily hear a small amount of unfiltered audio AND filtered audio at the same time in order to tune in the SSB station.
This is required especially the closer you get to 100% filtering.
On CW the reason is the 250ms latency makes CW impossible if you can hear filtered audio coming back to you a quarter of a second later hence you need to kill filtered audio on CW TX only.
I have a solution to both of these issues that is simple to add and it will make your CW and SSB operating a real pleasure.
I have several suggestions which I will post here in a few days.
I am VERY impressed with this app - no question.
For today, this tip on connecting to the 7300.
There is no need to use the USB port for your audio from the radio.
I have used a Beherenger audio mixer for many years and I will explain how I use it with RM Noise later.
I have integrated RM Noise into my mixer and added the required switching to make it all work.
My additions make operating SSB and CW a piece of cake.
For now, I will tell you that I take my audio from pin 12 of the ACC 13 pin DIN socket on the back of the 7300.
See page 12-1 of the basic manual, the pin out of the ACC DIN socket.
It is a fixed (adjustable) line output 5kohm impedance up to 300mV.
The line level output audio level is adjustable in the 7300 menu (Connectors) and mine is set at 60% and fed to the mixer & the PC line input.
I feed the PC input AND output audio to the mixer so I can hear as much or as little of the raw audio as needed to tune an SSB station.
Trust me, you NEED to have both filtered AND raw audio available to make this really user friendly....the raw audio is set much lower in level than the filtered audio and using the external mixer makes this super easy and user-friendly.
The balance control on the mixer is your friend.
I will make a rough sketch showing the connections and once you grasp the added functionality that the mixer brings, I am sure that it will prove very popular with many 7300 users.
Yes, you could hit the BYPASS button but that does not give you what the mixer gives you.
If you are listening to SSB filtered audio, it is very difficult to tune the station because of the latency BUT if you have a small amount of raw audio to tune the SSB, its a smile and a happy face!!.
I have a small amount of raw audio in my left ear and filtered audio in my right ear with absolute control over ALL level settings.
Works well on speaker also.
I also use the mixer to boost the mid-range audio around 2500Hz
I have several audio speaker options, all switchable from my operating position.
More later but for now......use pin 12 of the ACC socket.....simple and it works.
My operating has now changed and I could never go back to the lousy noise floor that I have at my QTH
55 years with lousy band noise and now RM Noise - NOT going back.
73 for now de Ray - VE7CY
I have attached a picture of the 802 Mixer that I use.
My description of the operation will follow and make reference to the controls in this picture.
I have been using RM Noise for 10 days now.
I have spent ALL of my waking hours on my 7300 with RM Noise.
In a nutshell I can tell you that on CW TX you MUST only be able to hear live audio side-tone on CW and be able to easily hear a small amount of unfiltered audio AND filtered audio at the same time in order to tune in the SSB station.
This is required especially the closer you get to 100% filtering.
On CW the reason is the 250ms latency makes CW impossible if you can hear filtered audio coming back to you a quarter of a second later hence you need to kill filtered audio on CW TX only.
I have a solution to both of these issues that is simple to add and it will make your CW and SSB operating a real pleasure.
I have several suggestions which I will post here in a few days.
I am VERY impressed with this app - no question.
For today, this tip on connecting to the 7300.
There is no need to use the USB port for your audio from the radio.
I have used a Beherenger audio mixer for many years and I will explain how I use it with RM Noise later.
I have integrated RM Noise into my mixer and added the required switching to make it all work.
My additions make operating SSB and CW a piece of cake.
For now, I will tell you that I take my audio from pin 12 of the ACC 13 pin DIN socket on the back of the 7300.
See page 12-1 of the basic manual, the pin out of the ACC DIN socket.
It is a fixed (adjustable) line output 5kohm impedance up to 300mV.
The line level output audio level is adjustable in the 7300 menu (Connectors) and mine is set at 60% and fed to the mixer & the PC line input.
I feed the PC input AND output audio to the mixer so I can hear as much or as little of the raw audio as needed to tune an SSB station.
Trust me, you NEED to have both filtered AND raw audio available to make this really user friendly....the raw audio is set much lower in level than the filtered audio and using the external mixer makes this super easy and user-friendly.
The balance control on the mixer is your friend.
I will make a rough sketch showing the connections and once you grasp the added functionality that the mixer brings, I am sure that it will prove very popular with many 7300 users.
Yes, you could hit the BYPASS button but that does not give you what the mixer gives you.
If you are listening to SSB filtered audio, it is very difficult to tune the station because of the latency BUT if you have a small amount of raw audio to tune the SSB, its a smile and a happy face!!.
I have a small amount of raw audio in my left ear and filtered audio in my right ear with absolute control over ALL level settings.
Works well on speaker also.
I also use the mixer to boost the mid-range audio around 2500Hz
I have several audio speaker options, all switchable from my operating position.
More later but for now......use pin 12 of the ACC socket.....simple and it works.
My operating has now changed and I could never go back to the lousy noise floor that I have at my QTH
55 years with lousy band noise and now RM Noise - NOT going back.
73 for now de Ray - VE7CY
I have attached a picture of the 802 Mixer that I use.
My description of the operation will follow and make reference to the controls in this picture.