[arm-allstar] arm-allstar Digest, Vol 6, Issue 36

Fri Nov 28 21:10:08 EST 2014

Here is some additional information regarding these modules DRA-818.  There
is a command called: AT+DMOCONNECT.  Per the programming manual:

Handshake Command
Description: It is used to check if the module works normally. DRA818U
module will send
back response information when it receives this command from the host. If
the host doesn’t
receive any response from module after three times of continuously sending
this command, it
will restart the module.
Format: AT+DMOCONNECT <CR><LF>
Module response: +DMOCONNECT: 0 <CR><LF>

One thing is  that the document does not indicate is that  the settings
will be reset.  This command is useful for checking the module, but the
other commands will need to be resent the the module since this will loose
all the module settings.  When I initially started play with these modules,
because I used the AT+DMOCONNECT command, I thought that the settings would
not be saved.  Once the module is programmed, power can be removed and the
settings will be remembered.

I have a simple Python program that sends down the programming commands and
then you can enter additional commands.  I am working on improving it as
it's very basic.
Let me know if you are interested in this program.  It does require a FDDI
USB/Serial  usb device.  I am using this one:

https://www.sparkfun.com/products/9873

Here are other vendors out there, such as Adafruit (
http://www.adafruit.com/product/954),  that have similar items.

73,

Chris, w0anm

On Fri, Nov 28, 2014 at 6:40 PM, Christopher Kovacs <w0anm73 at gmail.com>
wrote:

> Hi Greg,
>
> I  soldered resistor leads to the module.  You can then bend the leads
> slightly to allow the module to be mounted on a standard proto-boards.  Be
> careful the amount of heat that you use as you can damage them.
>
> https://www.dropbox.com/s/zmyzm6absmz7w67/IMG_20141128_181825.jpg?dl=0
> https://www.dropbox.com/s/n3d4uitmtk0l8mp/IMG_20141128_183736.jpg?dl=0
>
>
> I am working on a program to setup the frequencies, volume and filtering
> from a usb/serial device.  I have also discovered that these modules will
> save there frequency/setup information, so once it's programmed, it will
> remember the settings when powered up.  I originally thought that this was
> not the case with the DRA818u modules.
>
>
> 73,
>
> Chris, w0anm
>
> On Fri, Nov 28, 2014 at 11:31 AM, Greg Thornwall <thorn at myactv.net> wrote:
>
>>
>>
>> I ordered and recived a couple from the ebay seller last week. How does
>> one solder leads to them? Directly? Or is there some sort of "socket" that
>> would make it easier to use?
>>
>> I see this guy sells them mounted on a PCB which would make it easier to
>> setup:
>>
>> http://hamshop.cz/uvodni-stranka/rf-modules-c36/modul-
>> vhf-transceiveru-134174mhz-1w-dra818v-i266/
>>
>>
>> 73 Greg KD3SU
>>
>>
>>
>>
>>
>>
>> On 11/26/2014 12:00 PM, arm-allstar-request at hamvoip.org wrote:
>>
>>>
>>>
>>> ----------------------------------------------------------------------
>>>
>>> Message: 1
>>> Date: Tue, 25 Nov 2014 13:18:15 -0600
>>> From: "ssedgwick" <ssedgwick at suddenlink.net>
>>> To: <arm-allstar at hamvoip.org>
>>> Subject: [arm-allstar] DRA818V VHF Band Voice Transceiver Module and
>>>         DRA818U UHF Band Voice Transceiver Module
>>> Message-ID: <17B4A116D1BF4008B216477031F32622 at SteveOfficePC>
>>> Content-Type: text/plain; charset="utf-8"
>>>
>>> I saw these VHF and UHF voice transceivers modules talked about on
>>> another VOIP Yahoo group a couple weeks ago.  After looking at the specs, I
>>> see they are based on the RFIC RDA1846 transceiver IC chip.  Looks like a
>>> way to make a nice portable hot spot when tied to the BBB and the fine work
>>> Doug and others have done with Allstar.  I?m not a programmer, but I wonder
>>> if it would be possible to interface these modules to a BBB and be able to
>>> program the RF freuqency, PL, DPL, etc using touchtone commands, or if
>>> that?s not possible to program via ssh?
>>>
>>> Here?s a couple links to DRA818 modules and also ebay listings for both
>>> the VHF and UHF models.
>>>
>>> http://www.dorji.com/docs/data/DRA818U.pdf
>>>
>>> http://dorji.com/docs/data/DRA818V.pdf
>>>
>>> http://dorji.com/docs/app/ADW1003_DRA808M.pdf
>>>
>>> http://dorji.com/docs/app/ADW1011_configure_DRA818V_
>>> DRA818U_through_computer.pdf
>>>
>>> http://dorji.com/docs/app/ADW1004_DRA808M.pdf
>>>
>>> http://www.ebay.com/itm/191243649892
>>>
>>> http://www.ebay.com/itm/191210888951
>>>
>>> 73,
>>> Steve_WB8GRS
>>>
>>>
>> _______________________________________________
>>
>> arm-allstar mailing list
>> arm-allstar at hamvoip.org
>> http://lists.hamvoip.org/cgi-bin/mailman/listinfo/arm-allstar
>>
>> Visit the BBB web page - http://www.crompton.com/hamradio/
>> BeagleBoneBlackAllstar/
>>
>
>
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