[Lowfer] MP's captures

Sun, 05 Oct 2003 01:57:43 -0400

Eric,

The below info appears to make sense. If it wasn't for Jay's and John's 
signals I would have a lot of trouble figuring out where WA resides. With 
these signals I am able to calibrate ARGO to the R-75 (which is extremely 
stable as long as I leave it on) and then check WA. BTW, it looks like WA is 
right on .3000 after the adjustment. We'll see what John says tomorrow 
morning.

Bill A

>From: Eric Smith <[email protected]>
>Reply-To: [email protected]
>To: [email protected]
>Subject: Re: [Lowfer] MP's captures
>Date: Sun, 5 Oct 2003 00:15:57 -0500 (CDT)
>
>Hi, Bill,
>
> > Eric, I'll lower my osc to .3000 or mybe a bit lower in a few minutes.
>
>No need, I moved up near WE (I think heh see below).  Thanks, though.
>
> > How do you know you are at .3003?
>
>Unfortunately, I don't.  As you know, I don't have the gear to find out :(
>I'm using the ZL1BPU dds exciter and I used one of the 12.8 MHz TCXOs
>Stewart Nelson made available early this year.  The paperwork (in Chinese)
>that came with it had handwritten "12.80003" in pen -- I've always thought
>Stewart wrote this.
>
>ok -- bear with me ...
>
>The exciter is adjustable NOT in 1 Hz steps -- it's resolution depends on
>the xtal frequency.  The resolution relationship is:
>
>	Fcrystal / (9 x 2^24) Hz
>
>So, for me that works out to 0.084 Hz steps (or .08477107021543714735 Hz
>steps, really :)
>
>Anyway, I have a spreadsheet (from Lyle) that makes working this out easy
>so that I know what to plug into the exciter for a given frequency.  It is
>programmed with a number to be multiplied by the resolution to achieve the
>desired frequency.
>
>Since the steps are some odd number, it works out that my frequency should
>be 185.30201.
>
>But that all hinges on what the TCXO frequency really is.  If it is 10 Hz
>higher, my frequency would be off from where I think I have it programmed
>... it would be 185.30216.  If it is 50 Hz high, I would be at 185.30274.
>
>So, unfortunately, I'm only hoping for the best, and won't really know
>until someone can get a capture for me.
>
>Does that make any sense?
>
>Regards,
>Eric
>
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