Difference between revisions of "FrSky DHT RSSI configuration"
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(Created page with "The FrSky DHT is a flexible and relatively powerful 2.4 GHz transmitter. The kit comes as a DIY package with an RP-SMA connector which makes it easy to switch antennas. The commu...") |
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The FrSky DHT is a flexible and relatively powerful 2.4 GHz transmitter. The kit comes as a DIY package with an RP-SMA connector which makes it easy to switch antennas. The communication is two-way allowing for both Tx and Rx signal strength indication (RSSI). | The FrSky DHT is a flexible and relatively powerful 2.4 GHz transmitter. The kit comes as a DIY package with an RP-SMA connector which makes it easy to switch antennas. The communication is two-way allowing for both Tx and Rx signal strength indication (RSSI). The ACCST system shifts 80 channels around hundred times per second in the 2.4GHz band, similar to FSK. | ||
I will use | I will use an D6FR receiver in this setup. | ||
== Serial adapter == | == Serial adapter == | ||
To connect to the transmitter you need a USB-to-serial adapter. FrSky makes one with the necessary pin-header. | To connect to the transmitter you need a USB-to-serial adapter. FrSky makes one with the necessary pin-header. | ||
[[Image:frsky_usb_cable.jpg]] | [[Image:frsky_usb_cable.jpg|300px]] | ||
Plug the black header into the corresponding four pins on the transmitter. Power will be provided by the USB-port. | Plug the black header into the corresponding four pins on the transmitter. Power will be provided by the USB-port. | ||
| Line 13: | Line 13: | ||
The DHT provides a serial data port for configuration of the alarms for the RSSI and the two analog inputs. Download the [http://rc-miskolc.emiter.hu/index.php?option=com_content&view=article&id=114:frsky-setup-program&catid=35:tech&Itemid=113 3rd-party configuration program] and the required [http://www.frsky-rc.com/download.asp drivers]. | The DHT provides a serial data port for configuration of the alarms for the RSSI and the two analog inputs. Download the [http://rc-miskolc.emiter.hu/index.php?option=com_content&view=article&id=114:frsky-setup-program&catid=35:tech&Itemid=113 3rd-party configuration program] and the required [http://www.frsky-rc.com/download.asp drivers]. | ||
[[Image:frsky_config.png| | [[Image:frsky_config.png|500px]] | ||
== Antenna testing == | |||
To get an idea of how well the different set of antennas would perform, I swapped the antennas one by one and recorded the Tx and Rx values from the configuration application. | |||
* Transmitter: FrSky 2dbi rubber duck antenna | |||
** Receiver: FrSky 2dbi rubber duck antenna - RSSI Tx: '''99''' - RSSI Rx: '''99''' | |||
** Receiver: Dipole 33 mm wire antenna - RSSI Tx: '''99''' - RSSI Rx: '''99''' | |||
** Receiver: Dipole 30 mm wire antenna - RSSI Tx: '''99''' - RSSI Rx: '''99''' | |||
** Receiver: Generic Wifi whip antenna- RSSI Tx: '''99''' - RSSI Rx: '''99''' | |||
* Transmitter: Generic 2.4 GHz 14 dBi patch antenna | |||
** Receiver: FrSky 2dbi rubber duck antenna - RSSI Tx: '''99''' - RSSI Rx: '''99''' | |||
** Receiver: Dipole 33 mm wire antenna - RSSI Tx: '''99''' - RSSI Rx: '''99''' | |||
** Receiver: Dipole 30 mm wire antenna - RSSI Tx: '''99''' - RSSI Rx: '''99''' | |||
** Receiver: Generic Wifi whip antenna- RSSI Tx: '''99''' - RSSI Rx: '''99''' | |||
Revision as of 19:36, 12 August 2012
The FrSky DHT is a flexible and relatively powerful 2.4 GHz transmitter. The kit comes as a DIY package with an RP-SMA connector which makes it easy to switch antennas. The communication is two-way allowing for both Tx and Rx signal strength indication (RSSI). The ACCST system shifts 80 channels around hundred times per second in the 2.4GHz band, similar to FSK.
I will use an D6FR receiver in this setup.
Serial adapter
To connect to the transmitter you need a USB-to-serial adapter. FrSky makes one with the necessary pin-header.
Plug the black header into the corresponding four pins on the transmitter. Power will be provided by the USB-port.
RSSI configuration
The DHT provides a serial data port for configuration of the alarms for the RSSI and the two analog inputs. Download the 3rd-party configuration program and the required drivers.
Antenna testing
To get an idea of how well the different set of antennas would perform, I swapped the antennas one by one and recorded the Tx and Rx values from the configuration application.
- Transmitter: FrSky 2dbi rubber duck antenna
- Receiver: FrSky 2dbi rubber duck antenna - RSSI Tx: 99 - RSSI Rx: 99
- Receiver: Dipole 33 mm wire antenna - RSSI Tx: 99 - RSSI Rx: 99
- Receiver: Dipole 30 mm wire antenna - RSSI Tx: 99 - RSSI Rx: 99
- Receiver: Generic Wifi whip antenna- RSSI Tx: 99 - RSSI Rx: 99
- Transmitter: Generic 2.4 GHz 14 dBi patch antenna
- Receiver: FrSky 2dbi rubber duck antenna - RSSI Tx: 99 - RSSI Rx: 99
- Receiver: Dipole 33 mm wire antenna - RSSI Tx: 99 - RSSI Rx: 99
- Receiver: Dipole 30 mm wire antenna - RSSI Tx: 99 - RSSI Rx: 99
- Receiver: Generic Wifi whip antenna- RSSI Tx: 99 - RSSI Rx: 99
