[ICOM] IC-718

[Gary Fiber]

The IC-718 service manual says a 1.5 KHz tone at 30 mVrms (millivolts rms)
mic gain set to center, the radio should transmit at 100 Watts output. I
would just grab a scope and adjust the output of the sound card to 30 mVrms
or connect a wattmeter and send a 1.5 KHz tone into the radio and adjust the
sound card output until you see 100 watts, then I would personally back it
down to maybe 75 watts so I did not send distorted tones from possibly
overdriving the radio until you see your signals are being received with no
issues.

The mic input should be 600 Ohms and I seem to remember most sounds are also
600 Ohms, if not grab up a matching transformer. There are plenty of
circuits all over the net for connecting sound cards to radios most of them
should work for you just fine.

Gary K8IZ

-----Original Message-----
From: Icom [mailto:icom-bounces at mailman.qth.net] On Behalf Of Joe
Sent: Thursday, May 15, 2014 6:34 PM
To: icom at mailman.qth.net
Subject: Re: [ICOM] IC-718

Ok everyone thanks for all the help.

Now one more question. If I was to make an attenuator that takes say line
level audio voltages from a soundcard output. how many DB of an attenuator
should I make to knock it down to a level that would be suitable to feed
into the front Mic input?

Joe WB9SBD
Sig
The Original Rolling Ball Clock
Idle Tyme
Idle-Tyme.com
http://www.idle-tyme.com
On 5/15/2014 7:21 PM, Gary Fiber wrote:
> Joe another thing the receive audio from the accessory jack is at a 
> fixed level so the volume control will have no effect on that level 
> either. Hope this helps.
>
>
> Gary K8IZ
>
> -----Original Message-----
> From: Icom [mailto:icom-bounces at mailman.qth.net] On Behalf Of Joe
> Sent: Thursday, May 15, 2014 5:56 AM
> To: ICOM Reflector
> Subject: Re: [ICOM] IC-718
>
> Still trying to make sure.
>
> OK the audio going into the radio from the signalink.
>
> Will the speech processor ( Mic Compressor ) effect it at all if 
> turned on or off?
>
> I like how the signalink passes all the audio even like wav files. and 
> need to learn if when playing a recorded wav file if the processor can 
> be used or not.
>
> Joe WB9SBD
> Sig
> The Original Rolling Ball Clock
> Idle Tyme
> Idle-Tyme.com
> http://www.idle-tyme.com
> On 5/11/2014 9:37 AM, Joe wrote:
>> See below for comments,,
>> Sig
>> The Original Rolling Ball Clock
>> Idle Tyme
>> Idle-Tyme.com
>> http://www.idle-tyme.com
>> On 5/11/2014 9:13 AM, Patrick - KB8RTZ wrote:
>>> When the signalink box is plugged into the acc connector, make sure 
>>> you
> turn the mic gain down to zero through the menus. The mic gain control 
> does not affect AFSK or PSK operation, but the mic does not mute 
> during transmission.
>> So I Understand then when we switch from say SSB to RTTY, we need to 
>> turn down the mic gain so any sounds in the area that is picked up by 
>> the MIC does not get mixed in with the RTTY signal.
>>> The speech processor does not affect the incoming audio, either.
>> In coming as in going "INTO" the rig. From the signalink box not 
>> incoming as from the airwaves.
>>> The beauty of using the rear acc connector as opposed to the 
>>> headphone or
> external speaker jack is you can turn down the volume control without 
> affecting the input audio to the signalink box. The input audio level 
> is controlled by the receive audio knob on the signalink box.
>>> 73 ... Patrick ...
>>>
>>> Sent from the magic of technological innovation
>>>
>>> On May 11, 2014, at 9:33, Phil Krichbaum<vailphil at sopris.net>  wrote:
>>>
>>> I used the ACC plug for AFSK RTTY and WSJT for audio in and out with 
>>> my
> 756PROIII and neither of these controls have any effect. On the PROIII 
> I'd use the USB Digital position which also brought in to play a nice 
> twin peak
> 350 Hz RX filter which was excellent for RTTY.
>>>     73 Phil N0KE
>>>
>>> Joe wrote:
>>>> When inputting audio for say AFSK from a signal link box into the 
>>>> rear
> ACC jack. Two questions.
>>>> 1-  Does the front MIC gain control this level also?
>>>>
>>>> 2- The Speech Processor, Does it also apply to this input also if 
>>>> it is
> on or off?  Obviously you would not want it to be on when running RTTY 
> or PSK I just wonder if either of these controls effect audio that in 
> coming into the rig via the rear connector.
>>>> Joe WB9SBD
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