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Working satellites with IC-705 PstRotator or SDR-Console

This is a guide how to working satellites with the IC-705 or similar rig. When trying to understand the IC-705 I needed to write down how to use it – so this is how this post was born. I will try to explain 3 different user scenarios, each have a case for FM- and linear satellites :

  • Working stand alone (portable) without computer control
  • Working with SDR-Console for doppler adjust and a SDR as receiver
  • Working with PstRotator for doppler adjust

The IC-705 satellite memory examples and file can be found here.
Please contact me if you see anything that will not work in the following user cases – I have limited knowledge.

Setting up PstRotator

I will not explain how to use and set up PstRotator – the PstRotator manual is very good. The settings for Omnirig is like this:

And a typical layout for PstRotator Satellites Tracking is like this (and for reference image for the text below):

Case 1: Using IC-705 stand alone without computer control

FM satellites

  • Select split memory for the satellite in IC-705.
  • If needed adjust the RX frequency with the VFO knob (look at the waterfall).
  • Adjust the TX frequency for doppler when transmitting with VFO knob. Use a printed frequency chart for help.

Linear satellites with SSB transponder
(I have never tried semi-duplex on linear satellites before so not sure if this works)

  • Select split memory for the satellite in IC-705.
  • Adjust the RX frequency with the VFO knob to find a free space on the transponder (look at the waterfall).
  • Adjust the TX frequency (press PTT and use the VFO knob) to the correct frequency on the uplink. Use a printed frequency chart for help.
Case 2: Using IC-705 with SDR-Console v3

In this case the IC-705 is working as the transmitter with full doppler control and a SDR as receiver, also with doppler control.

FM satellites

  • Select the downlink frequency in SDR-Console for your SDR receiver and enable tracking in the satellite window, this will doppler control your RX.
  • Select the uplink memory for the satellite in IC-705 to get correct CCTCS tones.
  • Select the uplink frequency in SDR-Console, it will be transferred to External Radio windows.
  • Start External Radio in SDR Console for doppler control – no need to do anything on the IC-705 – just transmit.

Linear satellites with SSB transponder

  • Select the downlink frequency in SDR-Console for your SDR receiver and enable tracking in the satellite window, this will doppler control your RX.
  • Select the uplink frequency in SDR-Console, it will be transferred to External Radio windows.
  • Adjust the RX frequency at SDR Console to find a free space on the transponder (look at the waterfall).
  • Start External Radio in SDR Console for doppler control.
  • As SDR Console does not link (track) up/downlink VFOs – adjust the TX frequency on the IC-705 with the VFO knob to the correct frequency on the uplink. Doppler is corrected also during TX. Use a printed frequency chart for help.
    You can also adjust the frequency with the mouse wheel in at the External Radio windows. I find this better then using the VFO knob on the radio.


Case 3: Using IC-705 stand-alone with PstRotator

In this case PstRotator sets the correct frequency and mode on the IC-705 and has doppler control for both RX and TX. You are working IC-705 stand-alone as semi-duplex.

FM satellites

  • Select the satellite from PstRotator Favorites. Correct frequency, mode and subtone are now set in IC-705 VFOs.
  • Press the ”UP+DN” on PstRotator. Doppler is now adjusted on both RX and TX.
  • No need to do anything on the IC-705 – just transmit and listen.

Linear satellites with SSB transponder

  • Select the satellite from PstRotator Favorites. Correct frequency and mode are now set in IC-705 VFOs.
  • Press the ”UP+DN” on PstRotator and check that VFO linking are set to ”Reverse”. Doppler is now adjusted on both RX and TX and the VFOs are linked.
  • Adjust the RX frequency with the VFO knob to find a free space on the transponder (look at the waterfall). The TX is linked and will have correct frequency.
  • Change the VFO linking to ”Not linked” on PstRotator. This means that both TX and RX are still doppler adjusted but the TX frequency is locked (fixed). If needed you can adjust the RX frequency with the VFO knob on the IC-705.

Finally this is a short video when using the tiny GPD MicroPC with PstRotator and IC-705 as a portable computer controlled doppler adjustment.

Av SM0TGU

Webmaster and member of the AMSAT-SM steering group.

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