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ASTRO Spectra Rear DB15 for data

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KK4LQX

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Sep 1, 2012
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Location
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Hello All,

I have an ASTRO Spectra W9 that I would like to connect a TNC to and use the radio for data (APRS primarily) . I have gone over and over the pinout out of the radio and TNC and i'm certain my cable is ok. My pinout is as follows:

Radio Pin - Radio Function / TNC Function - TNC Pin
4 - SWB+ / Voltage Input - 7
8 - Dig GND / Ground - 6
11 - Disc. Audio / Receive Audio - 5
13 - PTT / Push to Talk - 3
15 - Mic Hi / Transmit Audio - 1

I use this same pinout at home on a Spectra and it works great. The info on this radio is: Model Number: T04KKH9PW9AN, Serial: 412CDG1332, FLASHcode: 580001-001800-0, Firmware 11.71.07.00, DSP N08.03.05

I am unable to PTT or receive audio from the radio. Is there something i'm missing in the Code Plug or cable that would change/prevent this?

Thank for your time and assistance
 

KK4LQX

Member
Premium Subscriber
Joined
Sep 1, 2012
Messages
100
Location
Portsmouth, RI
Tried using DB25

So for an update. I made a cable to use the DB25 connector that would otherwise be used for a VRS or Extra Control Head using the following pinout:

Radio----Function----TNC

1----------PTT----------3

9-------DET AUD------5 (RX Audio)

12---------MIC HI-------1 (TX Audio)

18-------DIG GND-------6

22---SWB+ (+12VDC)---7

I have receive audio but I still have no PTT.

Now i'm fairly certain it's something in the Code Plug. Any suggestions would be greatly appreciated.
 
Last edited:

cmdrwill

Member
Joined
Mar 30, 2005
Messages
3,234
Location
So Cali
You have to add a jumper in the AUX connector board on the radio.

You will also need a filter on the transmit audio so the Mark and Space are at the same deviation.
 
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