[RTTY] JRC-245 Hookup

[Joe Subich, W4TV]

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 at microham.com 
 


 

> -----Original Message-----
> From: rtty-bounces at contesting.com 
> [mailto:rtty-bounces at 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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