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[Linrad] Re: Error: MAP65-IQ 4KHZ not MHZ

As a part of the add-on routines for Linrad I wrote in 2005 to control 
my FT1000 transmit frequency from Linrad, I added a box to the Linrad 
receive display screen that allows adjusting the transmit radio's 
frequency to within 1 Hz.  If you are interested, it would be simple for 
yout to extract the applicable code and recompile Linrad and thus have 
it available to you.

Note that the new versions of my software addon no longer send the 
frequency directly to the radio as did old versions of my software. 
Instead, they writes the frequency information to a disk file [anywhere 
on the network] and an external routine [written in Visual Basic or 
Trubo Delphi or whatever you want] reads the data and sends the 
frequency info to the radio.  I did this to make it easier for me to 
send data across the network, and so that I wouldn't need to recompile 
Linrad each time I got a new radio.

The desired code resides in users_hwaredriver.c for Linux or 
wusers_hwaredriver.c for Windows.  I placed these files on my website, 
but renamed them so that you don't get them confused with any other 
versions that you might have on your computer already.  You would need 
to rename them using the nomenclature immediately above in order to 
compile them with Linrad.

I have placed files that were compatible with Linrad as of 1-26-09 at:

> http://www.nitehawk.com/w3sz/users_w3sz.c for Linux
> http://www.nitehawk.com/w3sz/wusers_w3sz.c for Windows

There are both some explanatory text and some old versions of the code 
on the OLD pages below [one is for Linux the the other for windows], You 
can ignore what you don't want.  The tar and zip files contain OLD 
versions of the code.  Don't use them; use the links above if you are 
going to recompile Linrad.

> http://www.nitehawk.com/w3sz/Lin-2-1000MP.htm
> http://www.nitehawk.com/w3sz/users_hwaredriver.zip
> http://www.nitehawk.com/w3sz/users_hwaredriver.tar

> http://www.nitehawk.com/w3sz/lin2ft1000mp-win.htm
> http://www.nitehawk.com/w3sz/wusers_hwaredriver.zip
> http://www.nitehawk.com/w3sz/wusers_hwaredriver.tar

I originally set this up so that I would be right on frequency with my 
transmitter when I used WSJT with Linrad during the EME contests.  I 
have since changed my setup so that any of multiple instances of Linrad 
running on any computer on the network can control the frequency of any 
rig on any other computer via the program WriteLog, which runs on 
another computer on the network, for terrestrial VHF/UHF/Microwave 
operation.  But I still use the original Linrad wusers_hwaredriver.c 
routines, which have been periodically adapted as necessary as Linrad's 
structure changed.


Roger Rehr


Roger Rehr

On 3/11/2009 12:43 AM, nedstearns@xxxxxxxxx wrote:
> Joe,
> There is a box in the lower left (until you move it) that lets you
> enter the center frequency of your hardware. Since I use the SDR-IQ on
> the 28 MHz IF of a DEMI transverter, I set the value to 28.125 to
> cover the digital EME passband. With that set, I use an fadd of 116000
> and I get pretty close to the right frequency on MAP65-IQ. I need to
> tweak the SDR-IQ setting through LINRAD around 200 Hz to be right on,
> but I don't know how to do that. The value in the box only allows 1
> KHz resolution. So, I just keep track of the offset and watch the
> value of DF in MAP65-IQ to decide which 1 KHz window to select for the
> focused decode.
> Ned
> On Mar 10, 5:54 pm, Joe Taylor<j...@xxxxxxxxxxxxx>  wrote:
>> Hi Ned,
>> You wrote something on the Linrad reflector that prompts me
>> to ask a question.  Where does one set a frequency
>> correction for the SDR-IQ in Linrad?  I haven't found this,
>> I guess.
>>          -- Joe, K1JT
>>> You need to get it right in both apps. I used a signal generator and
>>> got the offset frequency in LINRAD right first by watching its
>>> display. And then I modified the fadd in MAP65-IQ to get its display
>>> right. There is a 3rd offset which I cannot figure out how to control
>>> My SDR-IQ is off around 200 Hz. There is not enough resolution in the
>>> frequency correction in LINRAD to correct for that...maybe I can get
>>> it right by adjusting fadd in MAP65-IQ. What happens with that SDR-IQ
>>> frequency error  is that the station may be actually in the next 1 KHz
>>> increment than what my displays suggest. So, when I dial my TX
>>> frequency, I may be off by 1 KHz. To correct for that right now, I
>>> look at the DF and when it is a big number I known it is in the next 1
>>> KHz bin (which bin is determined by the sign of the DF).
>>> Ned
>>> AA7A
> >

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