Difference between revisions of "Updated Band Switching"

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Against each of the 16 bands, the following settings are stored:
 
Against each of the 16 bands, the following settings are stored:
 
* A Label that is displayed on the band select button and the Contest card for that band.
 
* A Label that is displayed on the band select button and the Contest card for that band.
−
* A transverter (transmit) local oscillator frequency, so that both the IF drive frequncy and the final transmitted frequency can be displayed on the Portsdown Menus.
+
* A transverter (transmit) local oscillator frequency, so that both the IF drive frequency and the final transmitted frequency can be displayed on the Portsdown Menus.
 
* Settings for the 4 GPIO lines, which are available on the Raspberry Pi GPIO header, the LimeSDR FPGA GPIO and the DATV Express GPIO pins.
 
* Settings for the 4 GPIO lines, which are available on the Raspberry Pi GPIO header, the LimeSDR FPGA GPIO and the DATV Express GPIO pins.
 
* An attenuation level for an external attenuator to set the transmit drive level.
 
* An attenuation level for an external attenuator to set the transmit drive level.
Line 16: Line 16:
 
* The TX port to be used for a LimeRFE (not yet implemented)
 
* The TX port to be used for a LimeRFE (not yet implemented)
 
* The Receive Attenuation for a LimeRFE (not yet implemented)
 
* The Receive Attenuation for a LimeRFE (not yet implemented)
 +
 +
===Factory Default Settings===
  
 
The factory default settings are shown below.  Note that the d0 to t8 designation and the band index are both used internally in the Portsdown and cannot be changed.
 
The factory default settings are shown below.  Note that the d0 to t8 designation and the band index are both used internally in the Portsdown and cannot be changed.
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{| class="wikitable"
 
{| class="wikitable"
 
|-
 
|-
−
! Usage !! Band name !! LO Frequency !! GPIO Binary !! GPIO Decimal !! (Band Designation) !! (Index)
+
! Usage !! Band name !! LO Frequency !! GPIO Binary !! GPIO Decimal !! (Band Desig) !! (Index)
 +
|-
 +
| 50 MHz Direct || 50_MHz || 0 || 1 0 0 0 || 8 || (d0) || (14)
 +
|-
 +
| 71 MHz Direct || 71_MHz || 0 ||  0 0 0 0 || 0 || (d1) || (0)
 +
|-
 +
| 146 MHz Direct || 146_MHz || 0 || 0 0 0 1 || 1 || (d2) || (1)
 
|-
 
|-
−
| 50 MHz Direct || 50_MHz || 0 || 1 0 0 0 || 8 || d0 || 14
+
| 437 MHz Direct || 70_cm || 0 || 0 0 1 0 || 2 || (d3) || (2)
 
|-
 
|-
−
| 71 MHz Direct || 71_MHz || 0 || 0 0 0 0 || 0 || d1 || 0
+
| 1255 MHz Direct || 23_cm || 0 || 0 0 1 1 || 3 || (d4) || (3)
 
|-
 
|-
−
| 146 MHz Direct || 146_MHz || 0 || 0 0 0 1 || 1 || d2 || 1
+
| 13 cm Direct || 13_cm || 0 || 1 0 1 1 || 11 || (d5) || (4)
 
|-
 
|-
−
| 437 MHz Direct || 70_cm || 0 || 0 0 1 0 || 2 || d3 || 2
+
| 9 cm Direct || 9_cm || 0 || 1 1 0 1 || 13 || (d6) || (15)
 
|-
 
|-
−
| 1255 MHz Direct || 23_cm || 0 || 0 0 1 1 || 3 || d4 || 3
+
| 50 MHz Transverter || 50_MHz_T|| -94.8 || 1 1 0 0 || 12 || (t0) || (9)
 
|-
 
|-
−
| 2400 MHz Direct || 13_cm || 0 || 1 0 1 1 || 11 || d5 || 4
+
| 13 cm Transverter || 13_cm_T || 2248.5 || 1 1 1 1 || 15 || (t5) || (10)
 
|-
 
|-
−
| Example || Example || Example || Example || Example
+
| 9 cm Transverter || 9_cm_T || 2970 || 0 1 0 0 || 4 || (t1) || (5)
 
|-
 
|-
−
| Example || Example || Example || Example || Example
+
| 6 cm Transverter || 6_cm_T || 5330 || 0 1 0 1 || 5  || (t2) || (6)
 
|-
 
|-
−
| Example || Example || Example || Example || Example
+
| 3 cm Transverter || 3_cm_T || 9930 || 0 1 1 0 || 6 || (t3) || (7)
 
|-
 
|-
−
| Example || Example || Example || Example || Example
+
| 24 GHz Tranverter || 24_GHz_T || 23610 || 0 1 1 1 || 7 || (t4) || (8)
 
|-
 
|-
−
| Example || Example || Example || Example || Example
+
| 47 GHz Tranverter || 47_GHz_T || 46944 || 1 0 0 1 || 9 || (t6) || (11)
 +
|-
 +
| 76 GHz Tranverter || 76_GHz_T || 75832 || 1 0 1 0 || 10 || (t7) || (12)
 +
|-
 +
| Spare || Spare || 0 || 1 1 1 0 || 14 || (t8) || (13)
 +
|}
 +
 
 +
===GPIO Lines===
 +
 
 +
The 4 GPIO lines used are listed below.  Note that the MSB is only available on a Portsdown 2020 if a 7 inch screen or the SSH console is being used to control the system.  The pin is used by smaller touchscreens, and so it cannot be used for band switching.
 +
 
 +
{| class="wikitable"
 
|-
 
|-
−
| Example || Example || Example || Example || Example
+
! Function !! Portsdown 4 Pin Number !! Portsdown 2020 Pin Number
 
|-
 
|-
−
| Example || Example || Example || Example || Example
+
| D0 LSB || 32 || 28
 
|-
 
|-
−
| Example || Example || Example || Example || Example
+
| D1 || 35 || 35
 
|-
 
|-
−
| Example || Example || Example || Example || Example
+
| D2 || 7 || 7
 
|-
 
|-
−
| Example || Example || Example || Example || Example
+
| D3 MSB || 22 || 22
 
|}
 
|}
 +
 +
The GPIO values can be duplicated between bands if more than one band needs the same switchuing arrangement.
 +
 +
===Changing the settings for a Band===
 +
 +
The settings for each band can be changed by selecting Menu 3, Set Band Details and then selecting the appropriate band.  The system will then request that you enter settings for each of the parameters above except the LimeRFE and Receive LO values.  The LimeRFE values are entered from the Lime Config Menu whilst the appropriate band is selected. 
 +
 +
The receive LO values (for driving and ADF4351-based up-converter) are entered by selecting Menu 3, Set RX LOs; note that this menu is not yet fully functional.
 +
 +
The contest numbers for the bands can also be managed in sets related to their locator from Menu 3, Set Call Loc & PIDs, Set Contest Codes.
 +
 +
Note that Band Settings can no longer be changed from the ssh menu.  Please either use a touchscreen or edit the config files directly.
 +
 +
===Selecting a Band for Use===
 +
 +
By default, the band is selected automatically based on the transmit frequency selected.  So anything under 60 MHz is assumed to be 50 MHz, anything between 50 and 100 MHz is assumed to be 71 MHz and so on.  To overide this and use a transverter, select the Band/Tvtr button on the main menu, and then select the transverter band that you want.  Alternatively, you can select "Direct" to resume automatic selection of bands where no transverter is used.
 +
 +
===Backwards Compatibility===
 +
 +
The settings above have been carefully chosen so that the default settings are backwards compatible with the 4-band and 8-band RF switch designs.
 +
 +
Note that if you update from previous version of Portsdown, the band settings will not be changed to the Factory defaults above.  You previous settings will be retained for the old bands.

Latest revision as of 13:48, 28 June 2021

The Portsdown band switching was updated in July 2021 to enable the selection of 16 bands.

By default, 7 of these bands are for direct transmission (without a transverter), and 9 are allocated for transverter use.

Against each of the 16 bands, the following settings are stored:

  • A Label that is displayed on the band select button and the Contest card for that band.
  • A transverter (transmit) local oscillator frequency, so that both the IF drive frequency and the final transmitted frequency can be displayed on the Portsdown Menus.
  • Settings for the 4 GPIO lines, which are available on the Raspberry Pi GPIO header, the LimeSDR FPGA GPIO and the DATV Express GPIO pins.
  • An attenuation level for an external attenuator to set the transmit drive level.
  • The transmit power level for a DATV Express card
  • The Lime Gain for a LimeSDR
  • The Pluto output power level
  • The Contest numbers for the band
  • The receive LO frequency for an ADF4351-based receive converter (primarily for 50 and 70 MHz operation)
  • Enable/disable for a LimeRFE PA
  • The TX port to be used for a LimeRFE (not yet implemented)
  • The Receive Attenuation for a LimeRFE (not yet implemented)

Factory Default Settings

The factory default settings are shown below. Note that the d0 to t8 designation and the band index are both used internally in the Portsdown and cannot be changed.

Usage Band name LO Frequency GPIO Binary GPIO Decimal (Band Desig) (Index)
50 MHz Direct 50_MHz 0 1 0 0 0 8 (d0) (14)
71 MHz Direct 71_MHz 0 0 0 0 0 0 (d1) (0)
146 MHz Direct 146_MHz 0 0 0 0 1 1 (d2) (1)
437 MHz Direct 70_cm 0 0 0 1 0 2 (d3) (2)
1255 MHz Direct 23_cm 0 0 0 1 1 3 (d4) (3)
13 cm Direct 13_cm 0 1 0 1 1 11 (d5) (4)
9 cm Direct 9_cm 0 1 1 0 1 13 (d6) (15)
50 MHz Transverter 50_MHz_T -94.8 1 1 0 0 12 (t0) (9)
13 cm Transverter 13_cm_T 2248.5 1 1 1 1 15 (t5) (10)
9 cm Transverter 9_cm_T 2970 0 1 0 0 4 (t1) (5)
6 cm Transverter 6_cm_T 5330 0 1 0 1 5 (t2) (6)
3 cm Transverter 3_cm_T 9930 0 1 1 0 6 (t3) (7)
24 GHz Tranverter 24_GHz_T 23610 0 1 1 1 7 (t4) (8)
47 GHz Tranverter 47_GHz_T 46944 1 0 0 1 9 (t6) (11)
76 GHz Tranverter 76_GHz_T 75832 1 0 1 0 10 (t7) (12)
Spare Spare 0 1 1 1 0 14 (t8) (13)

GPIO Lines

The 4 GPIO lines used are listed below. Note that the MSB is only available on a Portsdown 2020 if a 7 inch screen or the SSH console is being used to control the system. The pin is used by smaller touchscreens, and so it cannot be used for band switching.

Function Portsdown 4 Pin Number Portsdown 2020 Pin Number
D0 LSB 32 28
D1 35 35
D2 7 7
D3 MSB 22 22

The GPIO values can be duplicated between bands if more than one band needs the same switchuing arrangement.

Changing the settings for a Band

The settings for each band can be changed by selecting Menu 3, Set Band Details and then selecting the appropriate band. The system will then request that you enter settings for each of the parameters above except the LimeRFE and Receive LO values. The LimeRFE values are entered from the Lime Config Menu whilst the appropriate band is selected.

The receive LO values (for driving and ADF4351-based up-converter) are entered by selecting Menu 3, Set RX LOs; note that this menu is not yet fully functional.

The contest numbers for the bands can also be managed in sets related to their locator from Menu 3, Set Call Loc & PIDs, Set Contest Codes.

Note that Band Settings can no longer be changed from the ssh menu. Please either use a touchscreen or edit the config files directly.

Selecting a Band for Use

By default, the band is selected automatically based on the transmit frequency selected. So anything under 60 MHz is assumed to be 50 MHz, anything between 50 and 100 MHz is assumed to be 71 MHz and so on. To overide this and use a transverter, select the Band/Tvtr button on the main menu, and then select the transverter band that you want. Alternatively, you can select "Direct" to resume automatic selection of bands where no transverter is used.

Backwards Compatibility

The settings above have been carefully chosen so that the default settings are backwards compatible with the 4-band and 8-band RF switch designs.

Note that if you update from previous version of Portsdown, the band settings will not be changed to the Factory defaults above. You previous settings will be retained for the old bands.

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