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[Yaesu] Re: [digitalradio] Re: FT1kD (Low-level/Aux) AF OUT Interface

To: <yaesu@contesting.com>
Subject: [Yaesu] Re: [digitalradio] Re: FT1kD (Low-level/Aux) AF OUT Interface
From: amtor@hotmail.com (Robert Kennedy)
Date: Wed Jul 23 09:12:55 2003

Have you tried taking the audio out from the Packet Din Plug.  Radio Shack 
used to sell (and may still sell) a 5 Pin DIN to  5 RCA jack adaptor.  I 
suspect that is where I am taking my audio from but I am not near my rig to 


>From: Vince <wa.tworsx@verizon.net>
>Reply-To: digitalradio@yahoogroups.com
>To: digitalradio@yahoogroups.com, yaesu@contesting.com
>Subject: [digitalradio] Re: FT1kD (Low-level/Aux) AF OUT Interface
To: <yaesu@contesting.com>
>Date: Mon, 21 Jul 2003 18:15:42 -0400
>Hello Rob (and Joe, W4JSI):
>Thanks for taking the time to reply to my posting.
>The interface that I use here is homemade and very simple, Rob. It
>includes two audio transformers (Radio Shack), one inserted in the LINE
>INput (for receive audio) and the other inserted in the LINE OUTput (for
>transmit audio).  I use two fixed value resistors (100k and 1k) that are
>connected across the secondary winding to reduce the modulation audio
>for the FT1kD.
>When I cabled from the AF OUT jack to the MICrophone input at the sound
>card and ran MMTTY, I was able to see small peaks at the RTTY Mark and
>Space frequencies, but printed text was very poor. That was a direct
>cable connection between AF OUT (radio) and MICrophone input (sound
>card).  While the sound card microphone Boost was enabled, I saw what I
>think was 60 Hertz spikes; so, I will need to isolate that connection
>channel with a (step up) transformer if I ever decide to use it again.
>It was at this point that I observed that the front panel controls (AF
>and RX MIX) appeared to affect the amplitude of the AF OUT signal (as
>indicated by the MMTTY displays).  I will attempt to repeat that here,
>because others have reported that their front panel controls do not
>affect the AF OUT level, which is in agreement with the description
>given within the Operating Manual.
>At present, I do use the AF OUT signal to drive an external stereo audio
>amplifier that drives the speakers used with my PC. Because
>howling/distortion is present during transmissions on certain HF HAM
>bands, my plan is to add a (step up) isolation transformer for that
>Rob. there is no PATCH Audio out on my FT1kD. In my configuration, the
>PATCH INput jack is used to receive the attenuated AFSK signal that is
>derived from the sound card LINE OUTput signal.
>Joe, I am using VOX control, but will perhaps wire up a COM port for PTT
>and a couple of relays, because I would like to have better operational
>control while using SSB voice/SSTV.
>Can anyone here suggest a source for a step-up transformer?  The AF OUT
>is spec as 200 millivolts, 600 ohms Z.
>73 and thanks again,
>de ~ Vince ~
>WA2RSX   IOTA  NA-026
>Robert Kennedy wrote:
> >
> > Hi Vince,
> >
> > What type of interface are you using?  Many interfaces introduce
> > attenuation
> > (using a resisitor or POT) on the line between the audio out of the
> > rig and
> > the line input of the sound card.
> >
> > Also check your sound card mic and line input settings of the sound
> > card
> > (via START -- SETTINGS -- CONTROL PANEL).  Many sound cards have the
> > 20 db
> > attenuation setting ON by default for the sound card mic connector and
> > some
> > do the same fo rthe line input as well.
> >
> > On the FT-1000D you should use the PATCH Audio out RCA jack instead of
> > the
> > STEREO mini audio out jack.  If you are using the later, the audio and
> > mix
> > controls will affect the signal going to the mic input of the sound
> > card.
> > (Also make sure you are using the right channel -- left or right).
> >
> > If all else fails, connect a small audio filter with a built in audio
> > amp
> > between the audio output source of your choice and the sound card line
> > input
> > jack to give you the control you want.
> >
> > 73
> > Rob
> >

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