Need to know what USB cable that FT736R users are using to connect their computer and SATPC32 with. It calls for a RS232 TTL cable but need to know what company and cable descrition they are using if possible., Thanks for any help !! Jack/KC7MG
Jack/KC7MG,
I made a very simple homebrew cable using just a two transistors and five resistors. Here is the circuit: http://www.mindspring.com/~n2wwd/html/body_doppler_compensation.html
I hate soldering connectors, so I took a DB9 cable and cut off one end to save on having to solder that connector, leaving only the connector on the radio side which needed to be soldered. I built the circuit on a small breadboard and put it in a plastic box. The cable works great.
GL
Rolf NR0T Amsat #38889 Amsat UK
On Mon, Mar 23, 2015 at 12:40 PM, [email protected] wrote:
Need to know what USB cable that FT736R users are using to connect their computer and SATPC32 with. It calls for a RS232 TTL cable but need to know what company and cable descrition they are using if possible., Thanks for any help !! Jack/KC7MG _______________________________________________ Sent via [email protected]. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
Here is the wiring of a serial interface
http://www.mindspring.com/~n2wwd/html/body_doppler_compensation.html
For usb to TTL you need 5V TTL logic and presumably similar connections and baud rates.
If you look on ebay you can see people selling them and the rig end needs the right connector, a 6 pin DIN.
You connect the TX of the USB lead to the RX on the radio (pin3) and the output of the rig (pin 2) to the RX on the USB converter and pin 1 to ground.
You probably don't need the pin 6 connection as the converter will be supplied by the USB power.
Make sure to get a USB cable with drivers available for your current operating system and ideally a common one so that drivers will be available in many years time for future systems.
Ideally if you could afford it a fully isolated interface would be better.
On 23/03/2015, [email protected] [email protected] wrote:
Need to know what USB cable that FT736R users are using to connect their computer and SATPC32 with. It calls for a RS232 TTL cable but need to know what company and cable descrition they are using if possible., Thanks for any help !! Jack/KC7MG
The FT-736R definitely has a serial interface, but it's not USB. It's the old style serial, aka "RS-232" or "Com port", except the signal levels are TTL (0-5v) instead of proper RS-232 (-12 to +12 usually). Actually it's +12 to -12, i.e. inverted in sense compared to TTL. So one needs a level shift and invert, which is what the circuit is for, and that then needs to plug into a Serial port.
Most computers built in the last several years (decade?) don't have serial ports, having replaced them for peripheral attachments with USB ports. Some computers have more USB ports than my car has cup holders. The difference is protocol - what information gets sent over the wires - and there USB is very different than simple Serial. If your computer doesn't have a serial port, you need to buy a USB to Serial adapter, and then plug the referenced circuit into that.
What Daniel refers to on sites like eBay are essentially the combination the two parts. They have a USB to RS-232 adapter, and the level shifter/inverter, all in one package. Good deal if you don't feel like a soldering project, but, yes, watch out for the drivers.
Regarding the circuit, if your program only sends commands to the 736, and never reads information from the 736 (I don't know of any that do), then you can simplify the diagram to just R1 and Q1. Either way, I would recommend you add a small diode (1N4001 or 1N914) between the Base of Q1 and ground (the Emitter pin), cathode at the Base, to protect Q1 from the negative swing of the RS-232 signal.
Good luck!
Greg KO6TH
Daniel Cussen wrote:
Here is the wiring of a serial interface
http://www.mindspring.com/~n2wwd/html/body_doppler_compensation.html
For usb to TTL you need 5V TTL logic and presumably similar connections and baud rates.
If you look on ebay you can see people selling them and the rig end needs the right connector, a 6 pin DIN.
You connect the TX of the USB lead to the RX on the radio (pin3) and the output of the rig (pin 2) to the RX on the USB converter and pin 1 to ground.
You probably don't need the pin 6 connection as the converter will be supplied by the USB power.
Make sure to get a USB cable with drivers available for your current operating system and ideally a common one so that drivers will be available in many years time for future systems.
Ideally if you could afford it a fully isolated interface would be better.
On 23/03/2015, [email protected] [email protected] wrote:
Need to know what USB cable that FT736R users are using to connect their computer and SATPC32 with. It calls for a RS232 TTL cable but need to know what company and cable descrition they are using if possible., Thanks for any help !! Jack/KC7MG
Sent via [email protected]. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
If fyou are going to homebuild you can skip the whole level shifter and inverter. Just get a usb to ttl cable an attacht the needed connector to the open end of the cable.
http://www.ftdichip.com/Products/Cables/USBTTLSerial.htm
73 de Andre PE1RDW
Op 24-03-15 om 06:12 schreef Greg D:
The FT-736R definitely has a serial interface, but it's not USB. It's the old style serial, aka "RS-232" or "Com port", except the signal levels are TTL (0-5v) instead of proper RS-232 (-12 to +12 usually). Actually it's +12 to -12, i.e. inverted in sense compared to TTL. So one needs a level shift and invert, which is what the circuit is for, and that then needs to plug into a Serial port.
Most computers built in the last several years (decade?) don't have serial ports, having replaced them for peripheral attachments with USB ports. Some computers have more USB ports than my car has cup holders. The difference is protocol - what information gets sent over the wires - and there USB is very different than simple Serial. If your computer doesn't have a serial port, you need to buy a USB to Serial adapter, and then plug the referenced circuit into that.
What Daniel refers to on sites like eBay are essentially the combination the two parts. They have a USB to RS-232 adapter, and the level shifter/inverter, all in one package. Good deal if you don't feel like a soldering project, but, yes, watch out for the drivers.
Regarding the circuit, if your program only sends commands to the 736, and never reads information from the 736 (I don't know of any that do), then you can simplify the diagram to just R1 and Q1. Either way, I would recommend you add a small diode (1N4001 or 1N914) between the Base of Q1 and ground (the Emitter pin), cathode at the Base, to protect Q1 from the negative swing of the RS-232 signal.
Good luck!
Greg KO6TH
Daniel Cussen wrote:
Here is the wiring of a serial interface
http://www.mindspring.com/~n2wwd/html/body_doppler_compensation.html
For usb to TTL you need 5V TTL logic and presumably similar connections and baud rates.
If you look on ebay you can see people selling them and the rig end needs the right connector, a 6 pin DIN.
You connect the TX of the USB lead to the RX on the radio (pin3) and the output of the rig (pin 2) to the RX on the USB converter and pin 1 to ground.
You probably don't need the pin 6 connection as the converter will be supplied by the USB power.
Make sure to get a USB cable with drivers available for your current operating system and ideally a common one so that drivers will be available in many years time for future systems.
Ideally if you could afford it a fully isolated interface would be better.
On 23/03/2015, [email protected] [email protected] wrote:
Need to know what USB cable that FT736R users are using to connect their computer and SATPC32 with. It calls for a RS232 TTL cable but need to know what company and cable descrition they are using if possible., Thanks for any help !! Jack/KC7MG
Sent via [email protected]. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
Sent via [email protected]. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
On 24/03/2015, Andre [email protected] wrote:
If fyou are going to homebuild you can skip the whole level shifter and inverter. Just get a usb to ttl cable an attacht the needed connector to the open end of the cable.
Just be aware, as already said the signal is INVERTED so a 1 is a 0 and a 0 is a 1, so the logic level needs to be the opposite of normal RS232 TTL levels, so connecting a standard 5V TTL to a connector probably will not work with a circuit to invert the logic.
Exactly. The transistor provides both the level shift and invert functions, so just connect it between the rig (TTL) and serial port (RS-232).
Greg. KO6TH
On March 24, 2015 5:47:19 AM PST, Daniel Cussen [email protected] wrote:
On 24/03/2015, Andre [email protected] wrote:
If fyou are going to homebuild you can skip the whole level shifter
and
inverter. Just get a usb to ttl cable an attacht the needed connector to the
open
end of the cable.
Just be aware, as already said the signal is INVERTED so a 1 is a 0 and a 0 is a 1, so the logic level needs to be the opposite of normal RS232 TTL levels, so connecting a standard 5V TTL to a connector probably will not work with a circuit to invert the logic. _______________________________________________ Sent via [email protected]. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
participants (6)
-
Andre -
Daniel Cussen -
Greg D -
Greg Dolkas
-
ingejack＠cox.net -
Rolf Krogstad