Icom IC-970H (IC 970 H IC970H) transceiver mods reviews software and diagrams

   
 
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22 December 2014, 9:27 UTC 


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Icom IC-970H (IC 970 H IC970H)
IC-970H
Programming interface schematics for Icom:
Programming software for Icom IC-970H (IC 970 H IC970H) :
PDF User Manual for Icom IC-970H (IC 970 H IC970H) :Icom IC-970H Instruction Manual
PDF Adjusments Procedures Manual with schematics for Icom IC-970H (IC 970 H IC970H) :
Schematics for Icom IC-970H (IC 970 H IC970H) :

Mods for Icom IC-970H (IC 970 H IC970H) :
    Icom IC-970H (IC 970 H IC970H) mod
    Icom IC-970H (IC 970 H IC970H) AFC Sat Control
    Icom IC-970H (IC 970 H IC970H) expanded RF
    Icom IC-970H (IC 970 H IC970H) Repeater Operation
    Icom IC-970H (IC 970 H IC970H) with 9600 Baud

Icom IC-970H (IC 970 H IC970H) technical specifications :  Icom IC-970H (IC 970 H IC970H) technical specifications

Icom IC-970H (IC 970 H IC970H) with 9600 Baud

To use the ICOM IC-970 on the UOSAT's (9600 baud), I made the following modifications:

Transmit
Solder a shielded wire (I used RG174) to the anode of D16 (1SV50E). This is at the junction of R52 (470K) and C44 (.0047). Make sure to solder the shield to the adjacent PC board ground plane.

Receive
Solder a shielded wire to pin 9 of IC11 (MC3357P), again make sure to solder the shield to the PC board ground plane.

Both transmit and receive are on the main unit circuit board. Make sure that you use IC11 as this is the sub band receiver. If you plan to use the IC-970 for terrestrial packet (ie. simplex on either 145 or 440) you will need to add another shielded wire to IC5, which is the main receiver discriminator.
I then brought the shielded wires out the rear of the radio.
I did this by removing the plate which covers the two holes located below ACC(1). In order to disconnect the wires from the modem, I installed two phono jacks in the center of the holes on the metal plate. I have used this setup with the G3RUH modem, PacComm NB96, and the MFJ-9600.
I found that it was not necessary to add the 10K series resistor to the transmit audio/deviation line. On all three, with the center of the 10K pot range as 12 o'clock, I found that about 1 o'clock to work best on for me.

Note:
Make sure that the DC power source for the TNC and 9600 baud modem are on a clean supply (no ripple). Several users have found this to be the reason they could not get their modems to work. Also make sure that the TNC modem switch is set to 9600 baud as this provides the 153.6kHz to the modem. The modem documentation is not very clear in this area. I run the terminal speed at 19,200.


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