Re: Hello

[Dave Sublette <arrl.net; k4to@xxxxxxxxxxxxxxxx>]

Hello Leif,

I will take some time to study your response later. Just now I am 
leaving for a Christmas party. In my case...I don't work eme (yet :-)). 
My needs are simple. I want work weak signal CW and all I want to do is 
command to use the 0-30 mhz input or the direct, 0-260 mhz, input on the 
SDR-14 and only in receive. No transmit with Linrad yet. After a quick 
read of your response, it looks like I would set up the two directories 
and the only difference for me would be the choice of direct or 0-30 mhz 
inputs. I am running the windows version of the program. I will have to 
figure out how to make two directories on this O/S.

So far I have been very pleased with Linrad just using the suggested 
parameters from W3SZ set up instructions. If I can learn more of how the 
program works, perhaps I can find other settings of the parameters that 
would optimize weak signal CW operation.

Thanks for your response and I hope you and your family have a very 
Merry Christmas.

73,

Dave, K4TO

Leif Asbrink wrote:
> Hi Dave,
> 
>> In order to change my SDR-14 from the Direct (144 mhz) input to the 0-30 
>> mhz input I have to send a command to the SDR. I can do that through the 
>> Linrad program but must go back to where I can select the letter U 
>> option. Then I have to enter all of the parameters again, including 
>> which input of the SDR I want. It would be no problem if I had two SDRs 
>> and use one on the 28 mhz IF and one on the 144 mhz IF.  I may have to 
>> buy another SDR of some type and run another session of Linrad in order 
>> to use both simultaneously.
> 
> The idea with Linrad is that you have a separate directory with
> all the parameters and calibration files for each hardware configuration.
> One would then run separate sessions of Linrad for the different
> configurations. If two configurations use the same hardware but
> need different parameters, for example X-pol on 144 and H-pol
> on higher microwave bands with WSE converters, it may be necessary
> to press 'X' on one session and then 'B' on the other one to
> prevent two sessions to try to use the same hardware.
> 
> The way I have intended Linrad to work for hardware control is
> via users_hwaredriver.c where owners of i.e. SDR-14 could
> add a command to change the input connector, perhaps control
> other relays via parallel, serial, USB or whatever interface
> that the hardware likes.
> 
> Maybe the most convenient procedure would be something like 
> this:
> 
> To change hardware, first press 'X'.
> You now have the choices 'B','P' and 'C' for single
> polarisation and also 'D' for X-pol.
> 
> I could add the options:
> 1 = some_directory_name
> 2 = another_directory_name
> 3 = yet_another_directory_name
> 4
> 5
> .
> .
> .
> 
> Which would then be the source for parameter and calibration
> files until session ends or another directory is selected
> the same way. (Pressing B would set the initial directory
> as the default one.)
> 
> You would have to specify the directory names in a file
> like this:
> 
> some_directory_name A
> another_directory_name C
> Yet_another_directory_name D
> 
> The letter after the directory name would be sent to a routine
> in users_hwaredriver.c where you can catch it and make Linrad
> send whatever the hardware wants in order to adjust itself in 
> accordance with the desired operation.
> 
> It seems to me that the above would be reasonably easy to
> implement (back home where I have some hardware...)
> 
> Do you see any problems with this approach? Hopefully it
> would work for the Tx side also:-)
> 
> Comments welcome!
> 
> 73
> 
> Leif
> 
> > 
> 

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