Phil,
The information I have (and the data used for developing JST-245
support with the microham interfaces) indicates that the JST-245
does not support FSK RTTY. It supports only AFSK - the RTTY mode
being only LSB with the display offset to ready the Mark frequency
with 2125/2295 Hz AFSK.
The limited operating instructions are in Section 5.7 (page
21) of the manual from which I received copies of a few pages.
The DB25 accessory jack is used as follows:
1 PTT In
5 Ground
9 Line Out (Receive Audio)
10 Ground
13 Mic Mute (+5 to +13.8 to mute)
14 +13.8V
15 Ground
16 Line In (Transmit Audio)
An example of the connection is shown on page 36 of the manual.
73,
... Joe Subich, W4TV
microHAM America
http://www.microHAM-USA.com
http://groups.yahoo.com/group/microHAM
support@microham.com
> -----Original Message-----
> From: rtty-bounces@contesting.com
> [mailto:rtty-bounces@contesting.com] On Behalf Of Phil Sussman
> Sent: Tuesday, December 25, 2007 4:17 AM
> To: RTTY Reflector
> Subject: [RTTY] JRC-245 Hookup
>
>
> Greetings,
>
> I am attempting to hookup RTTY to a Japan Radio JRC-245.
>
> I've tried both the front microphone jack and the rear accessory jack.
> Apparently if the rig is in the "RTTY" mode, the rig is governed
> by internally generated FSK (mark & shift set in setup menu) and
> controlled by a line at the accessory jack.
>
> The manual is woefully inadequate when it comes to the 25 pin
> accessory jack. There are both audio inputs and outputs shown,
> but the keying is Pin #1 or Pin #13?? I assume that PTT is
> achieved by applying a ground, but at what capacity. Transistor
> not working it. Also, what pin causes a shift.
>
> Also the schematic shows wiring to pins #1, 2, 3, 5, 6, 9, 10,
> 13, 14, 15, 16, 19, & 25. Grounds are 5, 10, 15, & 25. I haven't
> got a clue what the other lines do. I can't achieve a shift and
> can't key up except manually on the front panel PTT switch.
>
> If the manual isn't wrong, it sure is incomplete!
>
> Any assistance greatfully appreciated.
>
> Meanwhile, Happy Holidays!!!
>
> Phil - N8PS
>
>
>
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