Re: LF: 475 kc Exiter

[M0FMT <m0fmt@yahoo.co.uk>]

Hi Graham

Is there any proper documentation for this Opera stuff? Like description of the method of Keying and how the logging system works. How do you get qso data off the application other than screen dumps which seems a bit crude. There are software buttons but they don't all work as advertised.

 

Can you tell me where the full documentation is kept?

Can you tell me the Keying principle? I have not put the PC SC output on the scope but there must be an easier way to get at the info. Is it FSK or Phase shift or some clever On/Off keying or Magic?

Is there a web data base or is the screen info just a one shot?

Do I need an Internet connection during Beacon or QSO ing? With my issues concerning Good Old BT and their 19th century technology, rusty copper and wet string, in the far flung out posts of North Hertfordshire that can't be done, so does that preclude full use of this system.

Or is it all a secret and one has to dig into the application? Info in README is sparse.

Has there been any projects to put this application of PIC processor for say TX Beacon mode? Or RX for that matter?

 

There are more questions but any help would be of interest. Now that I have managed to probably defeat BTs best efforts to keep me off 500kc/s I would like to explore this mode a bit more. Thanks.

73 es GL Pete M0FMT IO91UX

From: Graham <g8fzk@g8fzk.fsnet.co.uk>
To: rsgb_lf_group@blacksheep.org
Sent: Thursday, 31 May 2012, 0:02
Subject: Re: LF: 475 kc Exiter

TX500 is not supporting WSPR or Opera

Opera is a single frequency  on/off    CW key replacement  mode , if it  can
send  CW or  QRSS  , then  it can  send  Opera  via the  com-port keying
facility, as many of the  MF/LF  stations  are  so  doing.

WSPR on the  other  hand is  FSK based and requires , either  audio>Rf
translation  or  DDS  excitation , each has its  own uses , the design
requirement /  concept  of  Opera  was  a  'Data mode'  ' To be  sent via a
normal CW Tx'

G..



--------------------------------------------------
From: "Clemens  Paul" <cpaul@gmx.net>
Sent: Wednesday, May 30, 2012 11:15 PM
To: <rsgb_lf_group@blacksheep.org>
Subject: Re: LF: 475 kc Exiter

> Uwe,
>
> here an Email from Juma from 2/2012 1regarding further developments:
>
>>Hello Clemens,
>>Thanks for your interest in JUMA TX500.
>>TX500 is not supporting WSPR or Opera. We will consider new transmit modes
>>in the future.
>
> 73
> Clemens
> DL4RAJ
>
> ----- Original Message -----
> From: "Warren Ziegler" <wd2xgj@gmail.com>
> To: <rsgb_lf_group@blacksheep.org>
> Sent: Wednesday, May 30, 2012 7:45 PM
> Subject: Re: LF: 475 kc Exiter
>
>
> Uwe,
>
>  The Juma 500 is a FB little transmitter, lots of built-in features
> (synthesizer, keyer, swr bridge, receive preselector, receive
> converter) in a very small package. It is capable of more than 60W
> out, I have run it with 15vdc (which is in-spec) and with a 30 ohm or
> so antenna impedance you can get 100W out all day and all night with
> no complaints.
>
> 73 Warren K2ORS
>
>
> On Sun, May 27, 2012 at 3:39 AM, Uwe Wensauer <uwe.wensauer@gmx.de> wrote:
>> What do You think about the JUMA TX500 TransmitterI
>>
>> In my eyes a small Rig with 60 Watt and built in Converter.
>>
>> By the way, have a look at the filters in use – easy to built an
>> duplicate
>>
>> Uwe, dk1kq
>
>
>
> --
> 73 Warren K2ORS
> WD2XGJ
> WD2XSH/23
> WE2XEB/2
> WE2XGR/1
>
>
>
> -----
> E-Mail ist virenfrei.
> Von AVG überprüft - www.avg.de
> Version: 2012.0.2178 / Virendatenbank: 2425/5033 - Ausgabedatum:
> 30.05.2012
>
>
>