Radio - Revision history

Fallinsideahole: /* RNet */

2026-02-20T23:38:46Z

RNet

← Older revision		Revision as of 23:38, 20 February 2026
Line 3:		Line 3:
	==RNet==		==RNet==

	Motorola RNet radios were the wireless modem radios used for communication in the [[FIRST Robotics Competition]] from [[1993]] to [[1999]]. ~~Rnet~~ radios establish a wireless serial communications link similar to a dial-up modem but over-the-air instead of phone lines.		Motorola RNet radios were the wireless modem radios used for communication in the [[FIRST Robotics Competition]] from [[1993]] to [[1999]]. RNet radios establish a wireless serial communications link similar to a dial-up modem but over-the-air instead of phone lines.

	In the 1990s, teams would be supplied RNets in the [[kit of parts]], but these were collected before the beginning of competition and teams in the pits were required to use a tether cable and tether adaptor, a 9-pin serial cable with a null-modem adaptor inserted to swap over the transmit and receive lines to connect the driver station to the robot controller - this also functioned as a wired tether outside of competition. Teams would be given a radio on the same frequency as the one positioned in their driver station to plug into their robot for the match.		In the 1990s, teams would be supplied RNets in the [[kit of parts]], but these were collected before the beginning of competition and teams in the pits were required to use a tether cable and tether adaptor, a 9-pin serial cable with a null-modem adaptor inserted to swap over the transmit and receive lines to connect the driver station to the robot controller - this also functioned as a wired tether outside of competition. Teams would be given a radio on the same frequency as the one positioned in their driver station to plug into their robot for the match.

Fallinsideahole: /* Modem Radios */

2026-02-19T22:31:23Z

Modem Radios

← Older revision		Revision as of 22:31, 19 February 2026
Line 15:		Line 15:

	==Modem Radios==		==Modem Radios==
	Starting in 2000 RS-422 modem radios made by [http://electrowave.com/ Ewave] with support for the RM2000 mode that the new [[IFI control system]] used were introduced. There are both "Mobile" and "Base" types, with the base having a longer metal antenna and the mobile a black rubbery one, but they can be used on either end interchangeably - as long as there is one of each base and mobile type in the connection pair, not two of the same type. Pairs of radios were given to teams in the kit which would work in conjunction with the robot controller and operator interface's team number settings to link together. At competition, operator-side radios were affixed to the inside of the driver station "glass". Tether cables for robot control were still required in the pits and a serial tether cable had to be used to connect a PC to the robot controller for uploading and debugging code. These radios are classified as 900MHz and operate between 902 and 928MHz with a total of 40 channels, 6 open and 34 competition-only. Because of the way the modems treated two consecutive 0xFF bits as a packet header, the PWM or analogue value of 255 (0xFF) would never be sent from joysticks or on-board sensors with the IFI control system changing the values to 254 before being sent. If two 255s were ever sent in a row, the modem would drop whatever previous bits it was assembling and seek to create a valid packet out of the following data, which would be offset by some amount of bits, creating garbage frames<ref>[https://www.team358.org/files/programming/ControlSystem2004-2008/ Team 358 2004-2008 Control System]</ref>.		Starting in [[2000]] RS-422 modem radios made by [http://electrowave.com/ Ewave] with support for the RM2000 mode that the new [[IFI control system]] used were introduced. There are both "Mobile" and "Base" types, with the base having a longer metal antenna and the mobile a black rubbery one, but they can be used on either end interchangeably - as long as there is one of each base and mobile type in the connection pair, not two of the same type. Pairs of radios were given to teams in the kit which would work in conjunction with the robot controller and operator interface's team number settings to link together. At competition, operator-side radios were affixed to the inside of the driver station "glass". Tether cables for robot control were still required in the pits and a serial tether cable had to be used to connect a PC to the robot controller for uploading and debugging code. These radios are classified as 900MHz and operate between 902 and 928MHz with a total of 40 channels, 6 open and 34 competition-only. Because of the way the modems treated two consecutive 0xFF bits as a packet header, the PWM or analogue value of 255 (0xFF) would never be sent from joysticks or on-board sensors with the IFI control system changing the values to 254 before being sent. If two 255s were ever sent in a row, the modem would drop whatever previous bits it was assembling and seek to create a valid packet out of the following data, which would be offset by some amount of bits, creating garbage frames<ref>[https://www.team358.org/files/programming/ControlSystem2004-2008/ Team 358 2004-2008 Control System]</ref>.

	IFI offered a pair of [https://web.archive.org/web/20010126144100fw_/http://www.innovationfirst.com/firstrobotics/radio_Pbasic.htm Ewave Screamer] wireless transceivers to upload and debug code wirelessly.		IFI offered a pair of [https://web.archive.org/web/20010126144100fw_/http://www.innovationfirst.com/firstrobotics/radio_Pbasic.htm Ewave Screamer] wireless transceivers to upload and debug code wirelessly.

	A larger style of radio was used in 2007 and 2008. These could transmit data at 19200bps compared to the 9600bps connection of the past radio modems.		A larger style of radio was used in [[2007]] and [[2008]]. These could transmit data at 19200bps compared to the 9600bps connection of the past radio modems.

	===Documentation===		===Documentation===

Fallinsideahole: /* Modem Radios */

2026-02-19T21:49:48Z

Modem Radios

← Older revision		Revision as of 21:49, 19 February 2026
Line 15:		Line 15:

	==Modem Radios==		==Modem Radios==
	Starting in 2000 ~~with the first [[IFI Control System]] new~~ RS-422 modem radios made by [http://electrowave.com/ Ewave] with support for the RM2000 mode that the IFI control system ~~uses~~. There are both "Mobile" and "Base" types, with the base having a longer metal antenna and the mobile a black rubbery one, but they can be used on either end interchangeably - as long as there is one of each base and mobile type in the connection pair, not two of the same type. Pairs of radios were given to teams in the kit which would work in conjunction with the robot controller and operator interface's team number settings to link together. At competition, operator-side radios were affixed to the inside of the driver station "glass". Tether cables for robot control were still required in the pits and a serial tether cable had to be used to connect a PC to the robot controller for uploading and debugging code. These radios are classified as 900MHz and operate between 902 and 928MHz with a total of 40 channels, 6 open and 34 competition-only. Because of the way the modems treated two consecutive 0xFF bits as a packet header, the PWM or analogue value of 255 (0xFF) would never be sent from joysticks or on-board sensors with the IFI control system changing the values to 254 before being sent. If two 255s were ever sent in a row, the modem would drop whatever previous bits it was assembling and seek to create a valid packet out of the following data, which would be offset by some amount of bits, creating garbage frames<ref>[https://www.team358.org/files/programming/ControlSystem2004-2008/ Team 358 2004-2008 Control System]</ref>.		Starting in 2000 RS-422 modem radios made by [http://electrowave.com/ Ewave] with support for the RM2000 mode that the new [[IFI control system]] used were introduced. There are both "Mobile" and "Base" types, with the base having a longer metal antenna and the mobile a black rubbery one, but they can be used on either end interchangeably - as long as there is one of each base and mobile type in the connection pair, not two of the same type. Pairs of radios were given to teams in the kit which would work in conjunction with the robot controller and operator interface's team number settings to link together. At competition, operator-side radios were affixed to the inside of the driver station "glass". Tether cables for robot control were still required in the pits and a serial tether cable had to be used to connect a PC to the robot controller for uploading and debugging code. These radios are classified as 900MHz and operate between 902 and 928MHz with a total of 40 channels, 6 open and 34 competition-only. Because of the way the modems treated two consecutive 0xFF bits as a packet header, the PWM or analogue value of 255 (0xFF) would never be sent from joysticks or on-board sensors with the IFI control system changing the values to 254 before being sent. If two 255s were ever sent in a row, the modem would drop whatever previous bits it was assembling and seek to create a valid packet out of the following data, which would be offset by some amount of bits, creating garbage frames<ref>[https://www.team358.org/files/programming/ControlSystem2004-2008/ Team 358 2004-2008 Control System]</ref>.

	IFI offered a pair of [https://web.archive.org/web/20010126144100fw_/http://www.innovationfirst.com/firstrobotics/radio_Pbasic.htm Ewave Screamer] wireless transceivers to upload and debug code wirelessly.		IFI offered a pair of [https://web.archive.org/web/20010126144100fw_/http://www.innovationfirst.com/firstrobotics/radio_Pbasic.htm Ewave Screamer] wireless transceivers to upload and debug code wirelessly.

Fallinsideahole: /* Documentation */

2026-02-19T21:22:59Z

Documentation

← Older revision		Revision as of 21:22, 19 February 2026
Line 22:		Line 22:

	===Documentation===		===Documentation===
	[https://www.frcarchive.com/frcwiki/index.php/File:Ewave_modem_techman.pdf Ewave Radio Modem Technical Manual]		[https://www.frcarchive.com/frcwiki/index.php/File:Ewave_modem_techman.pdf Ewave Radio Modem Technical Manual]<br>
	[https://www.frcarchive.com/frcwiki/index.php/File:RadioModemInstallationInfo.pdf Radio Modem Drawings]		[https://www.frcarchive.com/frcwiki/index.php/File:RadioModemInstallationInfo.pdf Radio Modem Drawings]

	===Gallery===		===Gallery===
	<gallery caption="Additional photos on the [https://www.frcarchive.com/index.php?q=post/list/modem_radio/1 FRC Archive]" perrow=4 heights=300px widths=250px>		<gallery caption="Additional photos on the [https://www.frcarchive.com/index.php?q=post/list/modem_radio/1 FRC Archive]" perrow=4 heights=300px widths=250px>

Fallinsideahole: /* Modem Radios */

2026-02-19T21:22:48Z

Modem Radios

← Older revision		Revision as of 21:22, 19 February 2026
Line 23:		Line 23:
	===Documentation===		===Documentation===
	[https://www.frcarchive.com/frcwiki/index.php/File:Ewave_modem_techman.pdf Ewave Radio Modem Technical Manual]		[https://www.frcarchive.com/frcwiki/index.php/File:Ewave_modem_techman.pdf Ewave Radio Modem Technical Manual]
			[https://www.frcarchive.com/frcwiki/index.php/File:RadioModemInstallationInfo.pdf Radio Modem Drawings]
	===Gallery===		===Gallery===
	<gallery caption="Additional photos on the [https://www.frcarchive.com/index.php?q=post/list/modem_radio/1 FRC Archive]" perrow=4 heights=300px widths=250px>		<gallery caption="Additional photos on the [https://www.frcarchive.com/index.php?q=post/list/modem_radio/1 FRC Archive]" perrow=4 heights=300px widths=250px>

Fallinsideahole: /* Modem Radios */

2026-02-17T02:49:29Z

Modem Radios

← Older revision		Revision as of 02:49, 17 February 2026
Line 15:		Line 15:

	==Modem Radios==		==Modem Radios==
	Starting in 2000 with the first [[IFI Control System]] new modem radios made by [http://electrowave.com/ Ewave] with support for the RM2000 mode that the IFI control system uses. There are both "Mobile" and "Base" types, with the base having a longer metal antenna and the mobile a black rubbery one, but they can be used on either end interchangeably - as long as there is one of each base and mobile type in the connection pair, not two of the same type. Pairs of radios were given to teams in the kit which would work in conjunction with the robot controller and operator interface's team number settings to link together. At competition, operator-side radios were affixed to the inside of the driver station "glass". Tether cables for robot control were still required in the pits and a serial tether cable had to be used to connect a PC to the robot controller for uploading and debugging code. These radios are classified as 900MHz and operate between 902 and 928MHz with a total of 40 channels, 6 open and 34 competition-only. Because of the way the modems treated two consecutive 0xFF bits as a packet header, the PWM or analogue value of 255 (0xFF) would never be sent from joysticks or on-board sensors with the IFI control system changing the values to 254 before being sent. If two 255s were ever sent in a row, the modem would drop whatever previous bits it was assembling and seek to create a valid packet out of the following data, which would be offset by some amount of bits, creating garbage frames<ref>[https://www.team358.org/files/programming/ControlSystem2004-2008/ Team 358 2004-2008 Control System]</ref>.		Starting in 2000 with the first [[IFI Control System]] new RS-422 modem radios made by [http://electrowave.com/ Ewave] with support for the RM2000 mode that the IFI control system uses. There are both "Mobile" and "Base" types, with the base having a longer metal antenna and the mobile a black rubbery one, but they can be used on either end interchangeably - as long as there is one of each base and mobile type in the connection pair, not two of the same type. Pairs of radios were given to teams in the kit which would work in conjunction with the robot controller and operator interface's team number settings to link together. At competition, operator-side radios were affixed to the inside of the driver station "glass". Tether cables for robot control were still required in the pits and a serial tether cable had to be used to connect a PC to the robot controller for uploading and debugging code. These radios are classified as 900MHz and operate between 902 and 928MHz with a total of 40 channels, 6 open and 34 competition-only. Because of the way the modems treated two consecutive 0xFF bits as a packet header, the PWM or analogue value of 255 (0xFF) would never be sent from joysticks or on-board sensors with the IFI control system changing the values to 254 before being sent. If two 255s were ever sent in a row, the modem would drop whatever previous bits it was assembling and seek to create a valid packet out of the following data, which would be offset by some amount of bits, creating garbage frames<ref>[https://www.team358.org/files/programming/ControlSystem2004-2008/ Team 358 2004-2008 Control System]</ref>.

	IFI offered a pair of [https://web.archive.org/web/20010126144100fw_/http://www.innovationfirst.com/firstrobotics/radio_Pbasic.htm Ewave Screamer] wireless transceivers to upload and debug code wirelessly.		IFI offered a pair of [https://web.archive.org/web/20010126144100fw_/http://www.innovationfirst.com/firstrobotics/radio_Pbasic.htm Ewave Screamer] wireless transceivers to upload and debug code wirelessly.

Fallinsideahole: /* Modem Radios */

2026-02-17T02:47:37Z

Modem Radios

← Older revision		Revision as of 02:47, 17 February 2026
Line 15:		Line 15:

	==Modem Radios==		==Modem Radios==
	Starting in 2000 with the first [[IFI Control System]] new modem radios made by [http://electrowave.com/ Ewave] with support for the RM2000 mode that the IFI control system uses. There are both "Mobile" and "Base" types, with the base having a longer~~, stiffer~~ antenna, but they can be used on either end interchangeably - as long as there is one of each base and mobile type in the connection pair, not two of the same type. Pairs of radios were given to teams in the kit which would work in conjunction with the robot controller and operator interface's team number settings to link together. At competition, operator-side radios were affixed to the inside of the driver station "glass". Tether cables for robot control were still required in the pits and a serial tether cable had to be used to connect a PC to the robot controller for uploading and debugging code. These radios are classified as 900MHz and operate between 902 and 928MHz with a total of 40 channels, 6 open and 34 competition-only. Because of the way the modems treated two consecutive 0xFF bits as a packet header, the PWM or analogue value of 255 (0xFF) would never be sent from joysticks or on-board sensors with the IFI control system changing the values to 254 before being sent. If two 255s were ever sent in a row, the modem would drop whatever previous bits it was assembling and seek to create a valid packet out of the following data, which would be offset by some amount of bits, creating garbage frames<ref>[https://www.team358.org/files/programming/ControlSystem2004-2008/ Team 358 2004-2008 Control System]</ref>.		Starting in 2000 with the first [[IFI Control System]] new modem radios made by [http://electrowave.com/ Ewave] with support for the RM2000 mode that the IFI control system uses. There are both "Mobile" and "Base" types, with the base having a longer metal antenna and the mobile a black rubbery one, but they can be used on either end interchangeably - as long as there is one of each base and mobile type in the connection pair, not two of the same type. Pairs of radios were given to teams in the kit which would work in conjunction with the robot controller and operator interface's team number settings to link together. At competition, operator-side radios were affixed to the inside of the driver station "glass". Tether cables for robot control were still required in the pits and a serial tether cable had to be used to connect a PC to the robot controller for uploading and debugging code. These radios are classified as 900MHz and operate between 902 and 928MHz with a total of 40 channels, 6 open and 34 competition-only. Because of the way the modems treated two consecutive 0xFF bits as a packet header, the PWM or analogue value of 255 (0xFF) would never be sent from joysticks or on-board sensors with the IFI control system changing the values to 254 before being sent. If two 255s were ever sent in a row, the modem would drop whatever previous bits it was assembling and seek to create a valid packet out of the following data, which would be offset by some amount of bits, creating garbage frames<ref>[https://www.team358.org/files/programming/ControlSystem2004-2008/ Team 358 2004-2008 Control System]</ref>.

	IFI offered a pair of [https://web.archive.org/web/20010126144100fw_/http://www.innovationfirst.com/firstrobotics/radio_Pbasic.htm Ewave Screamer] wireless transceivers to upload and debug code wirelessly.		IFI offered a pair of [https://web.archive.org/web/20010126144100fw_/http://www.innovationfirst.com/firstrobotics/radio_Pbasic.htm Ewave Screamer] wireless transceivers to upload and debug code wirelessly.
Line 26:		Line 26:
	===Gallery===		===Gallery===
	<gallery caption="Additional photos on the [https://www.frcarchive.com/index.php?q=post/list/modem_radio/1 FRC Archive]" perrow=4 heights=300px widths=250px>		<gallery caption="Additional photos on the [https://www.frcarchive.com/index.php?q=post/list/modem_radio/1 FRC Archive]" perrow=4 heights=300px widths=250px>
	File:37343 - 2003 air tank build frc1023 pneumatics radio robot.jpg\|~~An IFI modem~~ radio in situ [https://www.frcarchive.com/index.php?q=post/view/37343]		File:37343 - 2003 air tank build frc1023 pneumatics radio robot.jpg\|A "mobile" radio in situ [https://www.frcarchive.com/index.php?q=post/view/37343]
	File:5281 - 2003 2003oh frc291 frc302 match robot team.jpg\|~~IFI~~ radios hanging on the driver station wall [https://www.frcarchive.com/index.php?q=post/view/5281]		File:5281 - 2003 2003oh frc291 frc302 match robot team.jpg\|Base radios hanging on the driver station wall [https://www.frcarchive.com/index.php?q=post/view/5281]
	</gallery>		</gallery>

Fallinsideahole: /* Modem Radios */

2026-02-17T02:45:59Z

Modem Radios

← Older revision		Revision as of 02:45, 17 February 2026
Line 15:		Line 15:

	==Modem Radios==		==Modem Radios==
	Starting in 2000 with the first [[IFI Control System]] new modem radios made by [http://electrowave.com/ Ewave] with support for the RM2000 mode that the IFI control system uses. There are both "Mobile" and "Base" types, with the base having a longer, stiffer antenna, but they can be used on either end interchangeably - as long as there is one of each base and mobile type in the connection pair, not two of the same type. Pairs of radios were given to teams in the kit which would work in conjunction with the robot controller and operator interface's team number settings to link together. At competition, operator-side radios were affixed to the inside of the driver station "glass". Tether cables for robot control were still required in the pits and a serial tether cable had to be used to connect a PC to the robot controller for uploading and debugging code. These radios are classified as 900MHz and operate between 902 and 928MHz with a total of 40 channels, 6 open and 34 competition-only. Because of the way the modems treated two consecutive 0xFF bits as a packet header, the PWM or analogue value of 255 (0xFF) would never be sent from joysticks or on-board sensors with the IFI control system changing the values to 254 before being sent. If two 255s were ever sent in a row, the modem would drop whatever previous bits it was assembling and seek to create a valid packet out of the following data, which would be offset by some amount of bits, creating garbage frames.		Starting in 2000 with the first [[IFI Control System]] new modem radios made by [http://electrowave.com/ Ewave] with support for the RM2000 mode that the IFI control system uses. There are both "Mobile" and "Base" types, with the base having a longer, stiffer antenna, but they can be used on either end interchangeably - as long as there is one of each base and mobile type in the connection pair, not two of the same type. Pairs of radios were given to teams in the kit which would work in conjunction with the robot controller and operator interface's team number settings to link together. At competition, operator-side radios were affixed to the inside of the driver station "glass". Tether cables for robot control were still required in the pits and a serial tether cable had to be used to connect a PC to the robot controller for uploading and debugging code. These radios are classified as 900MHz and operate between 902 and 928MHz with a total of 40 channels, 6 open and 34 competition-only. Because of the way the modems treated two consecutive 0xFF bits as a packet header, the PWM or analogue value of 255 (0xFF) would never be sent from joysticks or on-board sensors with the IFI control system changing the values to 254 before being sent. If two 255s were ever sent in a row, the modem would drop whatever previous bits it was assembling and seek to create a valid packet out of the following data, which would be offset by some amount of bits, creating garbage frames<ref>[https://www.team358.org/files/programming/ControlSystem2004-2008/ Team 358 2004-2008 Control System]</ref>.

	IFI offered a pair of [https://web.archive.org/web/20010126144100fw_/http://www.innovationfirst.com/firstrobotics/radio_Pbasic.htm Ewave Screamer] wireless transceivers to upload and debug code wirelessly.		IFI offered a pair of [https://web.archive.org/web/20010126144100fw_/http://www.innovationfirst.com/firstrobotics/radio_Pbasic.htm Ewave Screamer] wireless transceivers to upload and debug code wirelessly.

Fallinsideahole: /* Modem Radios */

2026-02-17T02:44:55Z

Modem Radios

← Older revision		Revision as of 02:44, 17 February 2026
Line 15:		Line 15:

	==Modem Radios==		==Modem Radios==
	Starting in 2000 with the first [[IFI Control System]] new modem radios made by [http://electrowave.com/ Ewave] with support for the RM2000 mode that the IFI control system uses. There are both "Mobile" and "Base" types, with the base having a longer, stiffer antenna, but they can be used on either end interchangeably - as long as there is one of each base and mobile type in the connection pair, not two of the same type. Pairs of radios were given to teams in the kit which would work in conjunction with the robot controller and operator interface's team number settings to link together. At competition, operator-side radios were affixed to the inside of the driver station "glass". Tether cables for robot control were still required in the pits and a serial tether cable had to be used to connect a PC to the robot controller for uploading and debugging code. These radios are classified as 900MHz and operate between 902 and 928MHz with a total of 40 channels, 6 open and 34 competition-only.		Starting in 2000 with the first [[IFI Control System]] new modem radios made by [http://electrowave.com/ Ewave] with support for the RM2000 mode that the IFI control system uses. There are both "Mobile" and "Base" types, with the base having a longer, stiffer antenna, but they can be used on either end interchangeably - as long as there is one of each base and mobile type in the connection pair, not two of the same type. Pairs of radios were given to teams in the kit which would work in conjunction with the robot controller and operator interface's team number settings to link together. At competition, operator-side radios were affixed to the inside of the driver station "glass". Tether cables for robot control were still required in the pits and a serial tether cable had to be used to connect a PC to the robot controller for uploading and debugging code. These radios are classified as 900MHz and operate between 902 and 928MHz with a total of 40 channels, 6 open and 34 competition-only. Because of the way the modems treated two consecutive 0xFF bits as a packet header, the PWM or analogue value of 255 (0xFF) would never be sent from joysticks or on-board sensors with the IFI control system changing the values to 254 before being sent. If two 255s were ever sent in a row, the modem would drop whatever previous bits it was assembling and seek to create a valid packet out of the following data, which would be offset by some amount of bits, creating garbage frames.

	IFI offered a pair of [https://web.archive.org/web/20010126144100fw_/http://www.innovationfirst.com/firstrobotics/radio_Pbasic.htm Ewave Screamer] wireless transceivers to upload and debug code wirelessly.		IFI offered a pair of [https://web.archive.org/web/20010126144100fw_/http://www.innovationfirst.com/firstrobotics/radio_Pbasic.htm Ewave Screamer] wireless transceivers to upload and debug code wirelessly.

Fallinsideahole at 02:36, 17 February 2026

2026-02-17T02:36:48Z

← Older revision		Revision as of 02:36, 17 February 2026
Line 7:		Line 7:
	In the 1990s, teams would be supplied RNets in the [[kit of parts]], but these were collected before the beginning of competition and teams in the pits were required to use a tether cable and tether adaptor, a 9-pin serial cable with a null-modem adaptor inserted to swap over the transmit and receive lines to connect the driver station to the robot controller - this also functioned as a wired tether outside of competition. Teams would be given a radio on the same frequency as the one positioned in their driver station to plug into their robot for the match.		In the 1990s, teams would be supplied RNets in the [[kit of parts]], but these were collected before the beginning of competition and teams in the pits were required to use a tether cable and tether adaptor, a 9-pin serial cable with a null-modem adaptor inserted to swap over the transmit and receive lines to connect the driver station to the robot controller - this also functioned as a wired tether outside of competition. Teams would be given a radio on the same frequency as the one positioned in their driver station to plug into their robot for the match.

	==Gallery==		===Gallery===
	<gallery caption="Additional photos on the [https://www.frcarchive.com/index.php?q=post/list/rnet/1 FRC Archive]" perrow=3 heights=300px widths=250px>		<gallery caption="Additional photos on the [https://www.frcarchive.com/index.php?q=post/list/rnet/1 FRC Archive]" perrow=3 heights=300px widths=250px>
	File:45584 - 1997 control system rnet.jpg\|A pair of RNet radios [https://www.frcarchive.com/index.php?q=post/view/45584]		File:45584 - 1997 control system rnet.jpg\|A pair of RNet radios [https://www.frcarchive.com/index.php?q=post/view/45584]
Line 15:		Line 15:

	==Modem Radios==		==Modem Radios==
			Starting in 2000 with the first [[IFI Control System]] new modem radios made by [http://electrowave.com/ Ewave] with support for the RM2000 mode that the IFI control system uses. There are both "Mobile" and "Base" types, with the base having a longer, stiffer antenna, but they can be used on either end interchangeably - as long as there is one of each base and mobile type in the connection pair, not two of the same type. Pairs of radios were given to teams in the kit which would work in conjunction with the robot controller and operator interface's team number settings to link together. At competition, operator-side radios were affixed to the inside of the driver station "glass". Tether cables for robot control were still required in the pits and a serial tether cable had to be used to connect a PC to the robot controller for uploading and debugging code. These radios are classified as 900MHz and operate between 902 and 928MHz with a total of 40 channels, 6 open and 34 competition-only.

	In the era of the [[IFI Control System]], competition-legal radios were given to teams which would work in conjunction with the robot controller and operator interface's team number settings to link together. At competition, operator-side radios were affixed to the inside of the driver station "glass". Tether cables for robot control were still required in the pits and a serial tether cable had to be used to connect a PC to the robot controller for uploading and debugging code. IFI offered a pair of [https://web.archive.org/web/20010126144100fw_/http://www.innovationfirst.com/firstrobotics/radio_Pbasic.htm Ewave Screamer] wireless transceivers to upload and debug code wirelessly~~. A larger style of radio was used in 2007 and 2008. These radios operated at 900MHz with a total of 40 channels, 5 open and 35 competition-only~~.		IFI offered a pair of [https://web.archive.org/web/20010126144100fw_/http://www.innovationfirst.com/firstrobotics/radio_Pbasic.htm Ewave Screamer] wireless transceivers to upload and debug code wirelessly.

	==Gallery==		A larger style of radio was used in 2007 and 2008. These could transmit data at 19200bps compared to the 9600bps connection of the past radio modems.

			===Documentation===
			[https://www.frcarchive.com/frcwiki/index.php/File:Ewave_modem_techman.pdf Ewave Radio Modem Technical Manual]

			===Gallery===
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