[aprssig] Re: d700 miniDIN

Josh Gould kc8eqa at columbus.rr.com
Mon Feb 7 14:23:26 CST 2005

I think I've seen them at the local MicroCenter, You may want to check


-----Original Message-----
From: aprssig-bounces at lists.tapr.org
[mailto:aprssig-bounces at lists.tapr.org] On Behalf Of Wes Johnston
Sent: Monday, February 07, 2005 3:16 PM
To: TAPR APRS Mailing List
Cc: Stephen H. Smith
Subject: Re: [aprssig] Re: d700 miniDIN

Instead of building a Y cable to split out the rj45 mic connector, I
thought it might be easier to just plug the tiny track into the mini6
connector... it could sense the MIC's PTT status by using the PTT line
on the mini6... but I guess not.... now I'm back to original plan to
build a Y cable for rj45's... bummer.

Now that you mention mini6 ptt muting the mic, you have me thinking that
the "right" way to do this is to use the tiny track hooked to the mini6
and tap the PTT IN that tiny track needs from the MIC PTT line.  That
way tiny trak can keep track of the MIC's PTT status and when it aserts
the PTT, it'll mute the mic - cutting down on wind noise and such in the
car and making the packet clearer.

I guess everyone's seen those plastic phone splitters.... they plug into
a wall socket and have molded in the rear of them two side by side rj11
recepticals... wonder if they make those in rj45? Wes

Quoting "Stephen H. Smith" <WA8LMF2 at aol.com>:

> Wes Johnston wrote on 2/7/2005, 11:44 AM:
>  > Can anyone confirm that the PTT line in the mini-din connector 
> follows  > the MIC  > PTT button?  I'd like to attach a tiny track to 
> the D700
> Not sure what you are asking
> If you mean "Does the miniDIN6 jack operate on the same band as 
> selected for the Mic (i.e. selected by pushing in either the left or 
> right volume knob band select)", then the answer is YES.
> If you mean "Are the PTT pin of the mic jack and the PTT pin of the 
> miniDIN jack connected in parallel (i.e. so a TinyTrak connected on
> miniDIN could monitor the state of the mic's PTT button)",    then the
> answer is NO.
>       The miniDIN PTT line is processed separately from the mic's PTT,

> and is used to mute the mic input whenever the miniDIN input is 
> active.
> Full details on the MiniDIN 6-pin "DATA" connector follow.  This is a 
> reprint of a post I have made many times on various groups and mailing

> lists about this issue.....
> ======  PASTE ========
> The 6-Pin MiniDIN "DATA" or "PACKET" connector is an industry standard

> adopted by all the Japanese ham mfrs.  It is now superseding the 
> various proprietary 7, 8 and 13-pin full-sized DIN connectors used by 
> various manufacturers.  The contacts on this connector provide access 
> to:
> 1)  TWO kinds of receive audio:
>      Raw non-deemphasized discriminator output sometimes labeled "9600

> Baud Receive".
>      De-emphasized squelched audio similar to what comes out the 
> speaker, but at a fixed level unaffected by the volume control. It is 
> sometimes labled "1200 Baud Receive" or "RXD".
>      On multi-mode radios (Yaesu FT-817, Yaesu FT-100, Icom 706, etc),

> only the "1200 baud" output will be live on AM, SSB or CW since the 
> 9600 baud output is associated only with the discriminator of FM 
> receivers.
> 2)  TX audio input (sometimes misleadingly labeled "TX Data Input" or
> "TXD")  In some radios, a menu setting for "1200" vs "9600" baud will 
> determine if this input goes either into the same channel as the mic 
> input (but at a higher audio level) for 1200 baud packet, SSTV,
> EchoLink, AFSK RTTY, etc,   or is DC-coupled directly into the TX
> modulator (for 9600 baud packet).
> 3)  TX PTT (confusingly labeled "Standby" by Kenwood) -- normal 
> ground-to-transmit line  just like most mic inputs.
> 4)  Receiver Squelch status line (normally no sig-squelch-closed = 0V,

> signal active-squelch open = 5V). Sometimes labled "COR" (Carrier 
> Operated Relay - an archaic term from the early days of FM repeaters),

> "COS" (Carrier Operated Switch), "RX", "CD" (Carrier Detect), 
> "Activity" or "Busy".
> 5)  Common/Ground.
> Note that despite the misleading labels referring to data input and
> output, the jack only carries AUDIO, AUDIO, AUDIO!    THERE IS NO
> RXD or TXD DATA in the sense of RS-232 or TTL-level streams of 1s and 
> 0s anywhere on this connector!!!
> This connector is the perfect point to connect packet TNCs, soundcard 
> interfaces, phone patches, IRLP/EchoLink controllers, APRS trackers, 
> paging encoders, or any other device that needs access to the transmit

> and receive audio of a radio.
> These audio inputs and outputs are high-level (100-300mV), similar to 
> home stereo "LINE" input level seen at RCA jacks on tuners, amps, tape
> decks, etc;   NOT the the 5-10mV level seen at most mic input jacks.
>       NOTE that this means that you have to set the audio output
> ("TRANSMIT") level of sound card interfaces, TNCs, data controllers, 
> APRS trackers, etc to a MUCH higher level than you would for a normal 
> connection into the mic jack.  With some devices you will have to 
> shift internal jumpers,  or exercise software menu commands to 
> increase output level (recent Kantronics TNCs for example).
> On most radios with this port, grounding the DIN-6 PTT line mutes the 
> front panel mic input to prevent extraneous shack noises from getting 
> mixed with whatever you feed into the transmit audio input.
> You can connect a TinyTrak here very effectively if you:
> 1)  Change R5 (220K resistor) on the TT to about 27-33K to boost the 
> TX audio level from mic level to line level.
> 2)   Connect the direct DC-coupled "CARRIER DET" line of the TT to the
> MiniDIN "SQUELCH" or "COR" line.
> An annotated pinout diagram of this connector, useful as a worksheet 
> for making up cables,  is on my website at:
>     http://members.aol.com/wa8lmf/miscinfo
> Click through the link on this page which will take you to a directory

> of assorted downloadable files, not a web page.  Look for the file
>        MiniDIN6-Packet.pdf
> Note that this connector is exactly the same one used on PS/2 keyboard

> and mouse cables.  A  PS/2 keyboard extension cable is an excellent 
> source of a plug and cable assembly to mate with the jack on the 
> radio. [at a fraction of the cost of the optional Kenwood or Yaesu 
> cable assemblies! ] Cut the female end off, strip the bare end and 
> connect the bare leads to the appropriate pins of whatever mates with 
> your tracker, TNC, or soundcard interface.
> Stephen H. Smith                wa8lmf (at) aol.com
> Home Page:                      http://wa8lmf.com
> New/Updated Symbols for         http://members.aol.com/wa8lmf/ham
> UI-View and APRSplus:
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