--

I have a D710G.? A different pin is used for 1200 baud (narrow) vs 9600 baud (wide).? If you are using the din-6 adapter from Master Communications then you just need to move a jumper.? If you are using a DIN-6 to DB9 connector you will need to change how it is wired.? I have also found that I have to turn up the volumes to make it work as well when set toe 9600.

Mat

开云体育

When you switch the radio from 1200 to 9600 the audio goes out a different pin in the back of the radio.

Mat

John;

Menu 601 - DATA SPEED needs to be set to 9600

Mark - AD7EF

Mark, menu 601 is for the TNC, which we don't use with VARA FM,
we use data port.
which I thought was in 900 menu settings 919
but Ill try it
thanks john

yes I got that, but still nothing. thanks

Matt,
I have moved jumper. I think volume is the key.
are you able to work VARA FM at 9600?
I set the RMS to 9600 also, seems to work 1200 too.
thanks loads.
john

开云体育

The transmit audio level to the D710 needs to be significantly higher if you use the 9600 pin for input.

Ralph,
Its our gateway, its set at 9600.
I think our sound level is wrong. will get back to radio tonight
thanks
let u know
john

John;

Do you know if other ops have been able to connect and exchange data with that gateway, with "full-speed" VARA FM WIDE throughput (better than 50KB per minute)?

Mark - AD7EF

We have: typical here 256,000 b/min , this is 31 second session
john

TM-D710G 'data' port (mini-DIN 6) 1200bps - 9600bps details...

I've taken a careful look through the various manuals for the Kenwood DM-710 series radios, particularly the TM-D710G / GA Service manual.

The mini-DIN 6 "data" connector at the back of the TM-D710 radio chassis (-not- on the control head) is used for data communications with an external TNC or with "USB sound-card" radio interfaces such as the TigerTronics SignaLink or the Masters Communications RA- and DRA- boards.

As with almost all other VHF/UHF radios that can support 9600bps data communications, the TM-D710 radio chassis "data" connector has separate "1200bps" receive and "9600bps" receive-audio output pins, and one transmit-audio input pin. The TM-D710 menu 518 "EXT. DATA SPEED" setting controls how audio into and out of the "data" jack is routed to the corresponding circuitry in the radio.

When menu 518 is set to 1200bps, receive audio after bandpass filtering is routed to the 1200bps rx-audio pin (5 - 'PR1'), and transmit audio from the tx-audio pin (1 - 'PKD') is routed to a stage in the modulator circuit where bandpass filtering will be applied. When menu 518 is set to 9600bps, receive audio immediately out of the discriminator (no filtering) is routed to the 9600bps rx-audio pin (4 - 'PR9'), and transmit audio from the tx-audio pin (1 - 'PKD') is routed to a stage in the transmitter circuitry immediately before the reactance modulator, where no filtering is applied.

There's an important consequence of having two different audio inputs on the data connector for 1200bps vs. 9600bps; if you want to use one "USB sound-card" radio interface to connect to P2P or gateway stations operating in either 1200bps / VARA FM NARROW or 9600 bps / VARA FM WIDE modes, your radio and sound-card radio interface device must both be kept in the 9600bps configuration. Otherwise, you'd need to change the menu 518 setting and the interface cable each time you change from low-speed to high speed data communications. Fortunately, most gateway stations and P2P stations that use a TNC or sound-card radio interface designed for 1200bps operation can accommodate 1200bps connections from stations configured to operate at 9600bps.

A very convenient feature of the Kenwood VHF/UHF external TNC implementation is that the pin 3 'PKS' PTT-control signal will mute the radio microphone when an external TNC or sound-card radio interface keys the radio. This makes voice coordination on a P2P data link simply a matter of keying the microphone when the data link is idle.

Mark - AD7EF

John;

Those numbers are indicative of a good VARA FM NARROW link... Below is my session log from a local VARA FM gateway, operating at 1200bps, using my Kenwood TM-V71 with a DRA-45 board. My VARA FM modem was set for WIDE, but the gateway is listed as 1200 bps. The status indicator in my VARA FM modem window displayed NARROW during this session:

John;

I misinterpreted the connection log you sent. The numbers are very misleading because the messages are very short. A realistic measure of throughput is to send a reasonably large data file attachment. 60KByte to 100KByte .jpg files are good, because they don't compress very much. My tests were done with a data file attachment that compressed to about 70KBytes.

Mark - AD7EF

Mike,
Thanks this is all good info. Very helpful for our guys.
I'll run a big file later, and more details on our set up.
I am deep in some SQL updates this morning.

thanks!
john

Vara FM negotiates the connection speed. If a Narrow station connects to a Wide station (or vice versa), the Wide station will switch to Narrow, and the session will continue as Narrow.?

-Scott, NS7C